Drinking water in 50825
For this postcode RheinEnergie publishes several supply zones. Which of them serves an individual address is not published — below are the values of the zone with the most documented parameters, the remaining 5 underneath.
How to read the share of the parametric value
12 % Share of the parametric value. The proportion of the permitted maximum that the measured value uses — here 12 %, so just over an eighth.
< 10 % * Below the limit of quantification. The substance was not detectable. The mark shows where the detection limit lies relative to the parametric value — the actual share of the parametric value is below that.
Several samples per year: for chemical parameters the mean value is given, for microbiological ones the highest measured value. There the parametric value is zero — a single finding would disappear in the average, and it is precisely that finding which is the information. Which reference applies is stated in the last column of the table.
Köln linksrheinisch und Pulheim — Wasserwerke Hochkirchen und Weiler
RheinEnergieWater hardness
18.1 °dH
Hardness range hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,000014 mg/l | — | — | Mean · Source [1] |
| Nitrate | 22 mg/l | 50 mg/l | 44 % | Mean · Source [1] |
| Lead | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Single value · Source [2] |
| Sulphate | 73 mg/l | 250 mg/l | 29 % | Mean · Source [1] |
| Sodium | 35 mg/l | 200 mg/l | 18 % | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (77 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Single value · Source [2] |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Single value · Source [2] |
Chemical parameters (24)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Mean · Source [1] |
| Antimony | < 0,0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Mean · Source [1] |
| Arsenic | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Benzene | < 0,0002 mg/l below limit of quantification | 1 µg/l | < 20 % * | Mean · Source [1] |
| Benzo(a)pyrene | < 0,000003 mg/l below limit of quantification | 10 ng/l | < 30 % * | Mean · Source [1] |
| Bisphenol A | < 0,00003 mg/l below limit of quantification | 2.5 µg/l | < 1 % * | Mean · Source [1] |
| Boron | 0,08 mg/l | 1 mg/l | 8 % | Mean · Source [1] |
| Bromate | < 0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Mean · Source [1] |
| Cadmium | < 0,0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Mean · Source [1] |
| Chromium | < 0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Mean · Source [1] |
| Copper | < 0,02 mg/l below limit of quantification | 2 mg/l | < 1 % * | Mean · Source [1] |
| Cyanide | < 0,015 mg/l below limit of quantification | 50 µg/l | < 30 % * | Mean · Source [1] |
| Fluoride | 0,14 mg/l | 1.5 mg/l | 9 % | Mean · Source [1] |
| Lead | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean · Source [1] |
| Nickel | < 0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean · Source [1] |
| Nitrate | 22 mg/l | 50 mg/l | 44 % | Mean · Source [1] |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Source [1] |
| Pesticides | < 0,0005 mg/l below limit of quantification | 0.1 µg/l | cannot be assessed — the limit of quantification of the measurement is above the parametric value | Mean · Source [1] |
| Polycyclic aromatic hydrocarbons | < 0,00001 mg/l below limit of quantification | 0.1 µg/l | < 10 % * | Mean · Source [1] |
| Selenium | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Tetrachloroethene and Trichloroethene (sum) | < 0,00005 mg/l below limit of quantification | 10 µg/l | < 0.5 % * | Mean · Source [1] |
| Trihalomethanes — Total | 0,00011 mg/l | 50 µg/l | 0.2 % | Mean · Source [1] |
| Uranium | 0,0007 mg/l | 10 µg/l | 7 % | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (22)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorobutane sulfonic acid (PFBS) | 0,0000043 mg/l | — | — | Mean · Source [1] |
| Perfluorobutanoic acid (PFBA) | 0,0000030 mg/l | — | — | Mean · Source [1] |
| Perfluorodecane sulfonic acid (PFDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorodecanoic acid (PFDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorododecane sulfonic acid (PFDoDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorododecanoic acid (PFDoDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroheptane sulfonic acid (PFHpS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroheptanoic acid (PFHpA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorohexane sulfonic acid (PFHxS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorohexanoic acid (PFHxA) | 0,0000032 mg/l | — | — | Mean · Source [1] |
| Perfluorononane sulfonic acid (PFNS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorononanoic acid (PFNA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorooctanesulfonic acid (PFOS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorooctanoic acid (PFOA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoropentanesulfonic acid (PFPeS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoropentanoic acid (PFPeA) | 0,0000031 mg/l | — | — | Mean · Source [1] |
| Perfluorotridecanesulfonic acid (PFTrDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorotridecanoic acid (PFTrDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroundecanesulfonic acid (PFUnDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroundecanoic acid (PFUnDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Sum of 4 PFAS | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Sum of PFAS | 0,000014 mg/l | — | — | Mean · Source [1] |
Indicator parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,04 mg/l below limit of quantification | 0.2 mg/l | < 20 % * | Mean · Source [1] |
| Ammonium | < 0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Mean · Source [1] |
| Calcite dissolution capacity | -8,6 mg/l | 5 mg/l CaCO3 | — | Mean · Source [1] |
| Chloride | 58 mg/l | 250 mg/l | 23 % | Mean · Source [1] |
| Colony count 22 °C | 0 /ml | ohne anormale Veränderung | — | Mean · Source [1] |
| Colony count 36 °C | 0 /ml | ohne anormale Veränderung | — | Mean · Source [1] |
| Colour | < 0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Mean · Source [1] |
| Conductivity (25 °C) | 784 µS/cm | 2,790 µS/cm | — | Mean · Source [1] |
| Iron | < 0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Mean · Source [1] |
| Manganese | < 0,001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean · Source [1] |
| Odour | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value · Source [1] |
| pH | 7,30 | 6,5–9,5 | — | Mean · Source [1] |
| Sodium | 35 mg/l | 200 mg/l | 18 % | Mean · Source [1] |
| Sulphate | 73 mg/l | 250 mg/l | 29 % | Mean · Source [1] |
| Taste | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value · Source [1] |
| Temperature | 12,7 °C | — | — | Mean · Source [1] |
| Total organic carbon (TOC) | 0,39 mg/l | ohne anormale Veränderung | — | Mean · Source [1] |
| Turbidity | 0,04 NTU | 1 NTU | — | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Further parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 4,6 mol/m³ | — | — | Mean · Source [1] |
| Base capacity to pH 8.2 | 0,49 mol/m³ | — | — | Mean · Source [1] |
| Calcium | 106 mg/l | — | — | Mean · Source [1] |
| Carbonate hardness | 12,9 °dH | — | — | Mean · Source [1] |
| Hardness range (WRMG) | hart | — | — | Single value · Source [1] |
| Hydrogen carbonate | 280 mg/l | — | — | Mean · Source [1] |
| Magnesium | 14 mg/l | — | — | Mean · Source [1] |
| Oxygen | 8 mg/l | — | — | Mean · Source [1] |
| Phosphate | < 0,05 mg/l below limit of quantification | — | — | Single value · Source [1] |
| Potassium | 4,5 mg/l | — | — | Mean · Source [1] |
| Total hardness | 18,1 °dH | — | — | Mean · Source [1] |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Sources: [1] https://web.cdn.rheinenergie.com/cms/media/documents/trinkwasseranalyse/Trinkwasseranalyse_Linksrheinisch.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026 [2] koeln-1.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026
Show 5 more supply zones in this postcode
Köln rechtsrheinisch – Wasserwerke Höhenhaus und Zündorf
RheinEnergieAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
15.6 °dH
Hardness range Hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,000023 mg/l | — | — | Mean · Source [1] |
| Nitrate | 20 mg/l | 50 mg/l | 40 % | Mean · Source [1] |
| Lead | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Source [1] |
| Sulphate | 61 mg/l | 250 mg/l | 24 % | Mean · Source [1] |
| Sodium | 20 mg/l | 200 mg/l | 10 % | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (77 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean · Source [1] |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Mean · Source [1] |
Chemical parameters (24)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Mean · Source [1] |
| Antimony | <0,0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Mean · Source [1] |
| Arsenic | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Benzene | <0,0002 mg/l below limit of quantification | 1 µg/l | < 20 % * | Mean · Source [1] |
| Benzo(a)pyrene | <0,000003 mg/l below limit of quantification | 10 ng/l | < 30 % * | Mean · Source [1] |
| Bisphenol A | <0,00003 mg/l below limit of quantification | 2.5 µg/l | < 1 % * | Mean · Source [1] |
| Boron | 0,11 mg/l | 1 mg/l | 11 % | Mean · Source [1] |
| Bromate | <0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Mean · Source [1] |
| Cadmium | <0,0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Mean · Source [1] |
| Chromium | <0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Mean · Source [1] |
| Copper | <0,02 mg/l below limit of quantification | 2 mg/l | < 1 % * | Mean · Source [1] |
| Cyanide | <0,015 mg/l below limit of quantification | 50 µg/l | < 30 % * | Mean · Source [1] |
| Fluoride | <0,05 mg/l below limit of quantification | 1.5 mg/l | < 3 % * | Mean · Source [1] |
| Lead | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean · Source [1] |
| Mercury | <0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean · Source [1] |
| Nickel | <0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean · Source [1] |
| Nitrate | 20 mg/l | 50 mg/l | 40 % | Mean · Source [1] |
| Nitrite | <0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean · Source [1] |
| Pesticides | <0,0005 mg/l below limit of quantification | 0.1 µg/l | cannot be assessed — the limit of quantification of the measurement is above the parametric value | Mean · Source [1] |
| Polycyclic aromatic hydrocarbons | <0,00001 mg/l below limit of quantification | 0.1 µg/l | < 10 % * | Mean · Source [1] |
| Selenium | 0,0005 mg/l | 10 µg/l | 5 % | Mean · Source [1] |
| Tetrachloroethene and Trichloroethene (sum) | 0,0007 mg/l | 10 µg/l | 7 % | Mean · Source [1] |
| Trihalomethanes — Total | <0,00005 mg/l below limit of quantification | 50 µg/l | < 0.1 % * | Mean · Source [1] |
| Uranium | 0,0003 mg/l | 10 µg/l | 3 % | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (22)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorobutane sulfonic acid (PFBS) | 0,0000077 mg/l | — | — | Mean · Source [1] |
| Perfluorobutanoic acid (PFBA) | 0,0000021 mg/l | — | — | Mean · Source [1] |
| Perfluorodecane sulfonic acid (PFDS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorodecanoic acid (PFDA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorododecane sulfonic acid (PFDoDS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorododecanoic acid (PFDoDA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroheptane sulfonic acid (PFHpS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroheptanoic acid (PFHpA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorohexane sulfonic acid (PFHxS) | 0,0000030 mg/l | — | — | Mean · Source [1] |
| Perfluorohexanoic acid (PFHxA) | 0,0000025 mg/l | — | — | Mean · Source [1] |
| Perfluorononane sulfonic acid (PFNS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorononanoic acid (PFNA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorooctanesulfonic acid (PFOS) | 0,0000031 mg/l | — | — | Mean · Source [1] |
| Perfluorooctanoic acid (PFOA) | 0,0000027 mg/l | — | — | Mean · Source [1] |
| Perfluoropentanesulfonic acid (PFPeS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoropentanoic acid (PFPeA) | 0,0000017 mg/l | — | — | Mean · Source [1] |
| Perfluorotridecanesulfonic acid (PFTrDS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluorotridecanoic acid (PFTrDA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroundecanesulfonic acid (PFUnDS) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Perfluoroundecanoic acid (PFUnDA) | <0,000001 mg/l below limit of quantification | — | — | Mean · Source [1] |
| Sum of 4 PFAS | 0,0000088 mg/l | — | — | Mean · Source [1] |
| Sum of PFAS | 0,000023 mg/l | — | — | Mean · Source [1] |
Indicator parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,04 mg/l below limit of quantification | 0.2 mg/l | < 20 % * | Mean · Source [1] |
| Ammonium | <0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Mean · Source [1] |
| Calcite dissolution capacity | -2,4 mg/l | 5 mg/l CaCO3 | — | Mean · Source [1] |
| Chloride | 32 mg/l | 250 mg/l | 13 % | Mean · Source [1] |
| Colony count 22 °C | 0 /ml | ohne anormale Veränderung | — | Mean · Source [1] |
| Colony count 36 °C | 0 /ml | ohne anormale Veränderung | — | Mean · Source [1] |
| Colour | <0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Mean · Source [1] |
| Conductivity (25 °C) | 630 µS/cm | 2,790 µS/cm | — | Mean · Source [1] |
| Iron | <0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Mean · Source [1] |
| Manganese | <0,001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean · Source [1] |
| Odour | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Mean · Source [1] |
| pH | 7,33 | 6,5–9,5 | — | Mean · Source [1] |
| Sodium | 20 mg/l | 200 mg/l | 10 % | Mean · Source [1] |
| Sulphate | 61 mg/l | 250 mg/l | 24 % | Mean · Source [1] |
| Taste | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Mean · Source [1] |
| Temperature | 13,4 °C | — | — | Mean · Source [1] |
| Total organic carbon (TOC) | 0,42 mg/l | ohne anormale Veränderung | — | Mean · Source [1] |
| Turbidity | 0,04 NTU | 1 NTU | — | Mean · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Further parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 4,0 mol/m³ | — | — | Mean · Source [1] |
| Base capacity to pH 8.2 | 0,39 mol/m³ | — | — | Mean · Source [1] |
| Calcium | 88 mg/l | — | — | Mean · Source [1] |
| Carbonate hardness | 11,1 °dH | — | — | Mean · Source [1] |
| Hardness range (WRMG) | Hart | — | — | Mean · Source [1] |
| Hydrogen carbonate | 242 mg/l | — | — | Mean · Source [1] |
| Magnesium | 14 mg/l | — | — | Mean · Source [1] |
| Oxygen | 7 mg/l | — | — | Mean · Source [1] |
| Phosphate | 1,1 mg/l | — | — | Mean · Source [2] |
| Potassium | 3,1 mg/l | — | — | Mean · Source [1] |
| Total hardness | 15,6 °dH | — | — | Mean · Source [1] |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Sources: [1] https://web.cdn.rheinenergie.com/cms/media/documents/trinkwasseranalyse/Trinkwasseranalyse_Koln-rechtsrheinisch-2020.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026 [2] koeln-2.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026
Frechen (Wasserwerk Türnich)
RheinEnergieAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
16 °dH
Hardness range hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,000004 mg/l | — | — | Mean |
| Nitrate | < 5,0 mg/l below limit of quantification | 50 mg/l | < 10 % * | Mean |
| Lead | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean |
| Sulphate | 117 mg/l | 250 mg/l | 47 % | Mean |
| Sodium | 14,2 mg/l | 200 mg/l | 7 % | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (77 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Mean |
Chemical parameters (24)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Mean |
| Antimony | < 0,0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Mean |
| Arsenic | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Benzene | < 0,0002 mg/l below limit of quantification | 1 µg/l | < 20 % * | Mean |
| Benzo(a)pyrene | < 0,000003 mg/l below limit of quantification | 10 ng/l | < 30 % * | Mean |
| Bisphenol A | < 0,00003 mg/l below limit of quantification | 2.5 µg/l | < 1 % * | Mean |
| Boron | < 0,02 mg/l below limit of quantification | 1 mg/l | < 2 % * | Mean |
| Bromate | < 0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Mean |
| Cadmium | < 0,0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Mean |
| Chromium | < 0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Mean |
| Copper | < 0,02 mg/l below limit of quantification | 2 mg/l | < 1 % * | Mean |
| Cyanide | < 0,015 mg/l below limit of quantification | 50 µg/l | < 30 % * | Mean |
| Fluoride | 0,11 mg/l | 1.5 mg/l | 7 % | Mean |
| Lead | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Nickel | < 0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean |
| Nitrate | < 5,0 mg/l below limit of quantification | 50 mg/l | < 10 % * | Mean |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean |
| Pesticides | < 0,0005 mg/l below limit of quantification | 0.1 µg/l | cannot be assessed — the limit of quantification of the measurement is above the parametric value | Mean |
| Polycyclic aromatic hydrocarbons | < 0,00001 mg/l below limit of quantification | 0.1 µg/l | < 10 % * | Mean |
| Selenium | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Tetrachloroethene and Trichloroethene (sum) | < 0,00005 mg/l below limit of quantification | 10 µg/l | < 0.5 % * | Mean |
| Trihalomethanes — Total | < 0,0002 mg/l below limit of quantification | 50 µg/l | < 0.4 % * | Mean |
| Uranium | <0,0001 mg/l below limit of quantification | 10 µg/l | < 1 % * | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (22)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorobutane sulfonic acid (PFBS) | 0,0000013 mg/l | — | — | Mean |
| Perfluorobutanoic acid (PFBA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorodecane sulfonic acid (PFDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorodecanoic acid (PFDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorododecane sulfonic acid (PFDoDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorododecanoic acid (PFDoDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroheptane sulfonic acid (PFHpS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroheptanoic acid (PFHpA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorohexane sulfonic acid (PFHxS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorohexanoic acid (PFHxA) | 0,0000014 mg/l | — | — | Mean |
| Perfluorononane sulfonic acid (PFNS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorononanoic acid (PFNA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorooctanesulfonic acid (PFOS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorooctanoic acid (PFOA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoropentanesulfonic acid (PFPeS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoropentanoic acid (PFPeA) | 0,0000013 mg/l | — | — | Mean |
| Perfluorotridecanesulfonic acid (PFTrDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorotridecanoic acid (PFTrDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroundecanesulfonic acid (PFUnDS) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroundecanoic acid (PFUnDA) | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Sum of 4 PFAS | < 0,000001 mg/l below limit of quantification | — | — | Mean |
| Sum of PFAS | 0,000004 mg/l | — | — | Mean |
Indicator parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,04 mg/l below limit of quantification | 0.2 mg/l | < 20 % * | Mean |
| Ammonium | < 0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Mean |
| Calcite dissolution capacity | -5,3 mg/l | 5 mg/l CaCO3 | — | Mean |
| Chloride | 26,9 mg/l | 250 mg/l | 11 % | Mean |
| Colony count 22 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colour | < 0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Mean |
| Conductivity (25 °C) | 612 µS/cm | 2,790 µS/cm | — | Mean |
| Iron | < 0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Mean |
| Manganese | < 0,001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean |
| Odour | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value |
| pH | 7,54 | 6,5–9,5 | — | Mean |
| Sodium | 14,2 mg/l | 200 mg/l | 7 % | Mean |
| Sulphate | 117 mg/l | 250 mg/l | 47 % | Mean |
| Taste | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value |
| Temperature | 14,9 °C | — | — | Mean |
| Total organic carbon (TOC) | 0,2 mg/l | ohne anormale Veränderung | — | Mean |
| Turbidity | 0,15 NTU | 1 NTU | — | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Further parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,2 mol/m³ | — | — | Mean |
| Base capacity to pH 8.2 | 0,19 mol/m³ | — | — | Mean |
| Calcium | 87 mg/l | — | — | Mean |
| Carbonate hardness | 9,0 °dH | — | — | Mean |
| Hardness range (WRMG) | hart | — | — | Single value |
| Hydrogen carbonate | 195 mg/l | — | — | Mean |
| Magnesium | 17 mg/l | — | — | Mean |
| Oxygen | 10 mg/l | — | — | Mean |
| Phosphate | < 0,05 mg/l below limit of quantification | — | — | Single value |
| Potassium | 2,8 mg/l | — | — | Mean |
| Total hardness | 16,0 °dH | — | — | Mean |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: https://web.cdn.rheinenergie.com/cms/media/documents/trinkwasseranalyse/Trinkwasseranalyse_Frechen_Wasserwerk_Tuernich_2021.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 13/07/2026
Köln linksrheinisch und Pulheim, Wasserwerke Hochkirchen und Weiler
RheinEnergieAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
18.1 °dH
Hardness range hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,000014 mg/l | — | — | Mean |
| Nitrate | 22 mg/l | 50 mg/l | 44 % | Mean |
| Lead | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean |
| Sulphate | 73 mg/l | 250 mg/l | 29 % | Mean |
| Sodium | 35 mg/l | 200 mg/l | 18 % | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (77 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 /100 ml | 0/100 ml | — | Mean |
| Intestinal enterococci | 0 /100 ml | 0/100 ml | — | Mean |
Chemical parameters (24)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Mean |
| Antimony | <0,0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Mean |
| Arsenic | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Benzene | <0,0002 mg/l below limit of quantification | 1 µg/l | < 20 % * | Mean |
| Benzo(a)pyrene | <0,000003 mg/l below limit of quantification | 10 ng/l | < 30 % * | Mean |
| Bisphenol A | <0,00003 mg/l below limit of quantification | 2.5 µg/l | < 1 % * | Mean |
| Boron | 0,08 mg/l | 1 mg/l | 8 % | Mean |
| Bromate | <0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Mean |
| Cadmium | <0,0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Mean |
| Chromium | <0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Mean |
| Copper | <0,02 mg/l below limit of quantification | 2 mg/l | < 1 % * | Mean |
| Cyanide | <0,015 mg/l below limit of quantification | 50 µg/l | < 30 % * | Mean |
| Fluoride | 0,14 mg/l | 1.5 mg/l | 9 % | Mean |
| Lead | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Mercury | <0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Nickel | <0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean |
| Nitrate | 22 mg/l | 50 mg/l | 44 % | Mean |
| Nitrite | <0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean |
| Pesticides | <0,0005 mg/l below limit of quantification | 0.1 µg/l | cannot be assessed — the limit of quantification of the measurement is above the parametric value | Mean |
| Polycyclic aromatic hydrocarbons | <0,00001 mg/l below limit of quantification | 0.1 µg/l | < 10 % * | Mean |
| Selenium | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Tetrachloroethene and Trichloroethene (sum) | <0,00005 mg/l below limit of quantification | 10 µg/l | < 0.5 % * | Mean |
| Trihalomethanes — Total | 0,00011 mg/l | 50 µg/l | 0.2 % | Mean |
| Uranium | 0,0007 mg/l | 10 µg/l | 7 % | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (22)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorobutane sulfonic acid (PFBS) | 0,0000043 mg/l | — | — | Mean |
| Perfluorobutanoic acid (PFBA) | 0,0000030 mg/l | — | — | Mean |
| Perfluorodecane sulfonic acid (PFDS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorodecanoic acid (PFDA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorododecane sulfonic acid (PFDoDS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorododecanoic acid (PFDoDA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroheptane sulfonic acid (PFHpS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroheptanoic acid (PFHpA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorohexane sulfonic acid (PFHxS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorohexanoic acid (PFHxA) | 0,0000032 mg/l | — | — | Mean |
| Perfluorononane sulfonic acid (PFNS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorononanoic acid (PFNA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorooctanesulfonic acid (PFOS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorooctanoic acid (PFOA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoropentanesulfonic acid (PFPeS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoropentanoic acid (PFPeA) | 0,0000031 mg/l | — | — | Mean |
| Perfluorotridecanesulfonic acid (PFTrDS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluorotridecanoic acid (PFTrDA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroundecanesulfonic acid (PFUnDS) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Perfluoroundecanoic acid (PFUnDA) | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Sum of 4 PFAS | <0,000001 mg/l below limit of quantification | — | — | Mean |
| Sum of PFAS | 0,000014 mg/l | — | — | Mean |
Indicator parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,04 mg/l below limit of quantification | 0.2 mg/l | < 20 % * | Mean |
| Ammonium | <0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Mean |
| Calcite dissolution capacity | -8,6 mg/l | 5 mg/l CaCO3 | — | Mean |
| Chloride | 58 mg/l | 250 mg/l | 23 % | Mean |
| Colony count 22 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colour | <0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Mean |
| Conductivity (25 °C) | 784 µS/cm | 2,790 µS/cm | — | Mean |
| Iron | <0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Mean |
| Manganese | <0,001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean |
| Odour | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value |
| pH | 7,30 | 6,5–9,5 | — | Mean |
| Sodium | 35 mg/l | 200 mg/l | 18 % | Mean |
| Sulphate | 73 mg/l | 250 mg/l | 29 % | Mean |
| Taste | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Single value |
| Temperature | 12,7 °C | — | — | Mean |
| Total organic carbon (TOC) | 0,39 mg/l | ohne anormale Veränderung | — | Mean |
| Turbidity | 0,04 NTU | 1 NTU | — | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Further parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 4,6 mol/m³ | — | — | Mean |
| Base capacity to pH 8.2 | 0,49 mol/m³ | — | — | Mean |
| Calcium | 106 mg/l | — | — | Mean |
| Carbonate hardness | 12,9 °dH | — | — | Mean |
| Hardness range (WRMG) | hart | — | — | Single value |
| Hydrogen carbonate | 280 mg/l | — | — | Mean |
| Magnesium | 14 mg/l | — | — | Mean |
| Oxygen | 8 mg/l | — | — | Mean |
| Phosphate | <0,05 mg/l below limit of quantification | — | — | Mean |
| Potassium | 4,5 mg/l | — | — | Mean |
| Total hardness | 18,1 °dH | — | — | Mean |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: https://web.cdn.rheinenergie.com/cms/media/documents/trinkwasseranalyse/Trinkwasseranalyse_Linksrheinisch.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 25/07/2026
PFAS-4
RheinEnergieAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
No core values are available for this zone yet.
Show all recorded parameters (4 — most recent value per parameter)
PFAS (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | 0,0000030 mg/l | — | — | Mean · PFAS-4 |
| Perfluorononanoic acid (PFNA) | <0,000001 mg/l below limit of quantification | — | — | Mean · PFAS-4 |
| Perfluorooctanesulfonic acid (PFOS) | 0,0000031 mg/l | — | — | Mean · PFAS-4 |
| Perfluorooctanoic acid (PFOA) | 0,0000027 mg/l | — | — | Mean · PFAS-4 |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: https://web.cdn.rheinenergie.com/cms/media/documents/trinkwasseranalyse/Trinkwasseranalyse_Koln-rechtsrheinisch-2020.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026
PFAS-20
RheinEnergieAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
No core values are available for this zone yet.
Show all recorded parameters (4 — most recent value per parameter)
PFAS (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | < 0,000001 mg/l below limit of quantification | — | — | Single value · PFAS-20 |
| Perfluorononanoic acid (PFNA) | < 0,000001 mg/l below limit of quantification | — | — | Single value · PFAS-20 |
| Perfluorooctanesulfonic acid (PFOS) | < 0,000001 mg/l below limit of quantification | — | — | Single value · PFAS-20 |
| Perfluorooctanoic acid (PFOA) | < 0,000001 mg/l below limit of quantification | — | — | Single value · PFAS-20 |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Source: koeln-1.pdf · Ausgabe 2026 · Jahresmittelwerte der Daten aus 2025 · retrieved on 11/07/2026
Frequent questions about postcode 50825
- How hard is the water in Postcode 50825?
- RheinEnergie publishes a total hardness of 18.1 °dH for the supply zone Köln linksrheinisch und Pulheim — Wasserwerke Hochkirchen und Weiler (hardness range hart). The hardness range is a classification under the German Detergents and Cleaning Products Act (soft below 8,4 °dH, medium 8,4 to 14 °dH, hard above that) and not a quality verdict — it indicates how much calcium and magnesium is dissolved in the water. Basis: Ausgabe 2026, retrieved on 11/07/2026.
- How much nitrate is in the drinking water in Postcode 50825?
- RheinEnergie publishes a nitrate value of 22 mg/l for the supply zone Köln linksrheinisch und Pulheim — Wasserwerke Hochkirchen und Weiler. The statutory parametric value is 50 mg/l; the measured value represents 44 % of the parametric value. Basis: Ausgabe 2026, retrieved on 11/07/2026.
- Who supplies the drinking water in Postcode 50825?
- RheinEnergie. The values shown here come from the supply zone Köln linksrheinisch und Pulheim — Wasserwerke Hochkirchen und Weiler and apply to the water the supplier delivers. What happens between the building connection and the tap — in old lead pipes, for example — is not covered by these analyses; information on that is provided by owners, the health authority or an examination by an accredited laboratory.
General questions — how current the data is, limit of quantification, parametric values, who is behind this site — are answered under Questions & answers.