Drinking water in Erftstadt
2 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.
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.
Entnahmestelle: HB Lommersum, Behälterausgang, Probenahmehahn (Probenahmeort: 53919 Weilerswist-Lommersum, Derkumerstraße, HB)
Verbandswasserwerk GmbHAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
21.6 °dH
Hardness range hard
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 6,2 mg/l | 50 mg/l | 12 % | Single value |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Escherichia coli (E. coli) | 0 MPN/100 ml | 0/100 ml | — | Single value |
| Sulphate | 150 mg/l | 250 mg/l | 60 % | Single value |
| Sodium | 30,9 mg/l | 200 mg/l | 15 % | Single value |
* 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 (86 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 MPN/100 ml | 0/100 ml | — | Single value |
| Intestinal enterococci | 0 KBE/100 ml | 0/100 ml | — | Single value |
Chemical parameters (58)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,0005 mg/l below limit of quantification | 3 µg/l | < 17 % * | Single value |
| 1,2-Dichloropropane | < 0,1 µg/l below limit of quantification | — | — | Single value |
| 2,4-D | < 0,00002 mg/l below limit of quantification | — | — | Single value |
| Acrylamide | < 0,00005 mg/l below limit of quantification | 0.1 µg/l | < 50 % * | Single value |
| Antimony | < 0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value |
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Atrazine | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Bentazone | < 0,00002 mg/l below limit of quantification | — | — | Single value |
| Benzene | < 0,00025 mg/l below limit of quantification | 1 µg/l | < 25 % * | Single value |
| Benzo(a)pyrene | < 0,000001 mg/l below limit of quantification | 10 ng/l | < 10 % * | Single value |
| Benzo(b)fluoranthene | < 0,000001 mg/l below limit of quantification | — | — | Single value |
| Benzo(ghi)perylene | < 0,000001 mg/l below limit of quantification | — | — | Single value |
| Benzo(k)fluoranthene | < 0,000001 mg/l below limit of quantification | — | — | Single value |
| Bisphenol A | < 0,00001 mg/l below limit of quantification | 2.5 µg/l | < 0.4 % * | Single value |
| Boron | 0,06 mg/l | 1 mg/l | 6 % | Single value |
| Bromacil | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Bromate | < 0,0025 mg/l below limit of quantification | 10 µg/l | < 25 % * | Single value |
| Bromodichloromethane | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Cadmium | < 0,0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Single value |
| Carbofuran | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Chloridazon | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Chlorotoluron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Chromium | < 0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Single value |
| Clopyralid | < 0,00005 mg/l below limit of quantification | — | — | Single value |
| Copper | < 0,001 mg/l below limit of quantification | 2 mg/l | < < 0.1 % * | Single value |
| Cyanide | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Dibromochloromethane | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Dicamba | < 0,00005 mg/l below limit of quantification | — | — | Single value |
| Dichlorprop | < 0,00002 mg/l below limit of quantification | — | — | Single value |
| Diuron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Fluoride | 0,21 mg/l | 1.5 mg/l | 14 % | Single value |
| Hexazinone | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Indeno(1,2,3-cd)pyrene | < 0,000001 mg/l below limit of quantification | — | — | Single value |
| Isoproturon | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| MCPA | < 0,00002 mg/l below limit of quantification | — | — | Single value |
| Mecoprop | < 0,00002 mg/l below limit of quantification | — | — | Single value |
| Mercury | < 0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Metazachlor | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Methabenzthiazuron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Metobromuron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Metolachlor | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Metoxuron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Monuron | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Nickel | < 0,001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Single value |
| Nitrate | 6,2 mg/l | 50 mg/l | 12 % | Single value |
| Nitrite | < 0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Single value |
| Propazine | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Selenium | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Simazine | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Terbuthylazine | < 0,000025 mg/l below limit of quantification | — | — | Single value |
| Tetrachloroethene | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Tribromomethane (bromoform) | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Trichloroethene | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Trichloromethane (chloroform) | < 0,0005 mg/l below limit of quantification | — | — | Single value |
| Trihalomethanes — Total | (n. b.) mg/l not determined | 50 µg/l | — | Single value |
| Uranium | 0,0005 mg/l | 10 µg/l | 5 % | Single value |
| Vinyl chloride | < 0,0005 mg/l below limit of quantification | 0.5 µg/l | < 100 % * | Single value |
* 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.
Indicator parameters (19)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value |
| Ammonium | < 0,06 mg/l below limit of quantification | 0.5 mg/l | < 12 % * | Single value |
| Calcite dissolution capacity | -11 mg/l | 5 mg/l CaCO3 | — | Single value |
| Chloride | 54 mg/l | 250 mg/l | 22 % | Single value |
| Coliform bacteria | 0 MPN/100 ml | 0/100 ml | — | Single value |
| Colony count 22 °C | 0 KBE/1 ml | ohne anormale Veränderung | — | Single value |
| Colony count 36 °C | 0 KBE/1 ml | ohne anormale Veränderung | — | Single value |
| Conductivity (25 °C) | 843 µS/cm | 2,790 µS/cm | — | Single value |
| Iron | 0,018 mg/l | 0.2 mg/l | 9 % | Single value |
| Manganese | 0,006 mg/l | 50 µg/l | 12 % | Single value |
| Odour | ohne | für den Verbraucher annehmbar | — | Single value |
| Oxidisability | < 0,5 mg O2/l below limit of quantification | 5 mg/l O2 | — | Single value |
| pH | 7,51 | 6,5–9,5 | — | Single value |
| Sodium | 30,9 mg/l | 200 mg/l | 15 % | Single value |
| Sulphate | 150 mg/l | 250 mg/l | 60 % | Single value |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value |
| Temperature | 13,5 °C | — | — | Single value |
| Total organic carbon (TOC) | < 1,0 mg/l below limit of quantification | ohne anormale Veränderung | — | Single value |
| Turbidity | < 0,10 FNU below limit of quantification | 1 NTU | — | Single value |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,9 mmol/l | — | — | Single value |
| Base capacity to pH 8.2 | 0,5 mmol/l | — | — | Single value |
| Calcium | 109 mg/l | — | — | Single value |
| Magnesium | 27,6 mg/l | — | — | Single value |
| Phosphate | < 0,6 mg/l below limit of quantification | — | — | Single value |
| Potassium | 5,1 mg/l | — | — | Single value |
| Total hardness | 3,86 mmol/l | — | — | Single value |
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://api.wasserportal.info/api/public/qualitaet/trinkwasseranalyse/ee899e8f-6a55-4d8f-9d4c-482d20481de8 · 03.11.2025 (Digital signiert) · Prüfzeitraum 29.09.2025 - 30.10.2025 · retrieved on 27/07/2026
Postcodes in this zone: 50374
Show 1 more supply zone
WW Dirmerzheim: Reinwassersammelleitung h. den Filtern
RWE Power AGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 21/03/2025. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | < 0,7 (± 0,1) mg/l below limit of quantification | 50 mg/l | < 1 % * | Single value |
| Lead | < 2,5 (± 0,3) µg/l below limit of quantification | 10 µg/l | < 25 % * | Single value |
| Escherichia coli (E. coli) | 0 (± 0) KBE/100 ml | 0/100 ml | — | Single value |
| Sulphate | 173 (± 20,9) mg/l | 250 mg/l | — | Single value |
| Sodium | 15,7 (± 1,0) mg/l | 200 mg/l | — | Single value |
* 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 (87 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 (± 0) KBE/100 ml | 0/100 ml | — | Single value |
| Intestinal enterococci | 0 (± 0) KBE/100 ml | 0/100 ml | — | Single value |
Chemical parameters (62)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,5 µg/l below limit of quantification | 3 µg/l | < 17 % * | Single value |
| 2,6-Dichlorobenzamide (BAM) | n.b. µg/l not determined | — | — | Single value |
| Acrylamide | < 0,025 µg/l below limit of quantification | 0.1 µg/l | < 25 % * | Single value |
| Antimony | < 2,0 (± 0,6) µg/l below limit of quantification | 5 µg/l | < 40 % * | Single value |
| Arsenic | < 0,5 (± 0,1) µg/l below limit of quantification | 10 µg/l | < 5 % * | Single value |
| Atrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Benzene | < 0,25 µg/l below limit of quantification | 1 µg/l | < 25 % * | Single value |
| Benzo(a)pyrene | < 1,0 ng/l below limit of quantification | 10 ng/l | < 10 % * | Single value |
| Benzo(b)fluoranthene | < 1,0 ng/l below limit of quantification | — | — | Single value |
| Benzo(ghi)perylene | < 1,0 ng/l below limit of quantification | — | — | Single value |
| Benzo(k)fluoranthene | < 1,0 ng/l below limit of quantification | — | — | Single value |
| Bisphenol A | n.b. mg/l not determined | 2.5 µg/l | — | Single value |
| Boron | < 0,02 (± 0,01) mg/l below limit of quantification | 1 mg/l | < 2 % * | Single value |
| Bromacil | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Bromate | < 0,005 (± 0,002) mg/l below limit of quantification | 10 µg/l | < 50 % * | Single value |
| Cadmium | < 0,1 (± 0,1) µg/l below limit of quantification | 3 µg/l | < 3 % * | Single value |
| Carbofuran | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Chloridazon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Chlorotoluron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Chromium | < 1,0 (± 0,2) µg/l below limit of quantification | 25 µg/l | < 4 % * | Single value |
| Copper | < 0,2 (± 0,1) µg/l below limit of quantification | 2 mg/l | < < 0.1 % * | Single value |
| Cyanazine | n.b. µg/l not determined | — | — | Single value |
| Cyanide | < 0,02 (± 0,01) mg/l below limit of quantification | 50 µg/l | < 40 % * | Single value |
| Desethylatrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Desisopropylatrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Diuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Epichlorohydrin | < 0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value |
| Ethofumesate | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Fenuron | n.b. µg/l not determined | — | — | Single value |
| Flufenacet | n.b. µg/l not determined | — | — | Single value |
| Fluoride | 0,08 (± 0,01) mg/l | 1.5 mg/l | — | Single value |
| Hexazinone | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Indeno(1,2,3-cd)pyrene | < 1,0 ng/l below limit of quantification | — | — | Single value |
| Isoproturon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Lead | < 2,5 (± 0,3) µg/l below limit of quantification | 10 µg/l | < 25 % * | Single value |
| Mercury | 0,02 (± 0) µg/l | 1 µg/l | — | Single value |
| Metalaxyl | n.b. µg/l not determined | — | — | Single value |
| Metamitron | n.b. µg/l not determined | — | — | Single value |
| Metazachlor | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Methabenzthiazuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metobromuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metolachlor | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metoxuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metribuzin | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Nickel | < 2,0 (± 0,3) µg/l below limit of quantification | 20 µg/l | < 10 % * | Single value |
| Nitrate | < 0,7 (± 0,1) mg/l below limit of quantification | 50 mg/l | < 1 % * | Single value |
| Nitrite | < 0,02 (± 0,01) mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value |
| Pesticides — Total | n.b. µg/l not determined | 0.5 µg/l | — | Single value |
| Polycyclic aromatic hydrocarbons | n.b. ng/l not determined | 0.1 µg/l | — | Single value |
| Prometryn | n.b. µg/l not determined | — | — | Single value |
| Propazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Propiconazole | n.b. µg/l not determined | — | — | Single value |
| Selenium | < 3,0 (± 0,6) µg/l below limit of quantification | 10 µg/l | < 30 % * | Single value |
| Simazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Tebuconazole | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Terbuthylazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Terbutryn | n.b. µg/l not determined | — | — | Single value |
| Tetrachloroethene | < 0,5 µg/l below limit of quantification | — | — | Single value |
| Triadimenol | n.b. µg/l not determined | — | — | Single value |
| Trichloroethene | < 0,5 µg/l below limit of quantification | — | — | Single value |
| Uranium | < 0,1 (± 0,1) µg/l below limit of quantification | 10 µg/l | < 1 % * | Single value |
| Vinyl chloride | < 0,5 µg/l below limit of quantification | 0.5 µg/l | < 100 % * | Single value |
* 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.
Indicator parameters (15)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 0,05 (± 0,01) mg/l below limit of quantification | 0.2 mg/l | < 25 % * | Single value |
| Ammonium | < 0,10 (± 0,02) mg/l below limit of quantification | 0.5 mg/l | < 20 % * | Single value |
| Calcite dissolution capacity | -8,4 (± 5) mg/l | 5 mg/l CaCO3 | — | Single value |
| Chloride | 50,7 (± 2,6) mg/l | 250 mg/l | — | Single value |
| Coliform bacteria | 0 (± 0) KBE/100 ml | 0/100 ml | — | Single value |
| Colour | < 0,1 (± 0,1) 1/m below limit of quantification | 0.5 m⁻¹ | — | Single value |
| Iron | < 0,02 (± 0,01) mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Single value |
| Manganese | < 0,02 (± 0,01) mg/l below limit of quantification | 50 µg/l | < 40 % * | Single value |
| Odour | geruchlos | für den Verbraucher annehmbar | — | Single value |
| pH | 7,5 (± 0,1) | 6,5–9,5 | — | Single value |
| Sodium | 15,7 (± 1,0) mg/l | 200 mg/l | — | Single value |
| Sulphate | 173 (± 20,9) mg/l | 250 mg/l | — | Single value |
| Taste | geschmacklos | für den Verbraucher annehmbar | — | Single value |
| Temperature | 14,0 (± 0,7) °C | — | — | Single value |
| Total organic carbon (TOC) | < 0,8 (± 0,1) mg/l below limit of quantification | ohne anormale Veränderung | — | Single value |
* 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 (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,85 (± 0,13) mmol/l | — | — | Single value |
| Base capacity to pH 8.2 | 0,16 (± 0,09) mmol/l | — | — | Single value |
| Calcium | 117 (± 13,5) mg/l | — | — | Single value |
| Hydrogen carbonate | 173,9 mg/l | — | — | Single value |
| Magnesium | 19,7 (± 2,7) mg/l | — | — | Single value |
| Oxygen | 10,2 (± 1,1) mg/l | — | — | Single value |
| Potassium | 3,1 (± 0,2) mg/l | — | — | Single value |
| Total hardness | 3,73 (± 0,47) mmol/l | — | — | Single value |
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://www.stw-erftstadt.de/fileadmin/Medienablage/Content/Dokumente/Wasser/Trinkwasseranalyse-20250321.pdf · 21.03.2025 · 23.10.2024 - 21.03.2025 · retrieved on 11/07/2026
Postcodes in this zone: 50374
Frequently asked questions about drinking water in Erftstadt
- How hard is the water in Erftstadt?
- Verbandswasserwerk GmbH publishes a total hardness of 3,86 mmol/l for the supply zone Entnahmestelle: HB Lommersum, Behälterausgang, Probenahmehahn (Probenahmeort: 53919 Weilerswist-Lommersum, Derkumerstraße, HB) — that corresponds to 21.6 °dH. 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: 03.11.2025 (Digital signiert), retrieved on 27/07/2026.
- How much nitrate is in the drinking water in Erftstadt?
- Verbandswasserwerk GmbH publishes a nitrate value of 6,2 mg/l for the supply zone Entnahmestelle: HB Lommersum, Behälterausgang, Probenahmehahn (Probenahmeort: 53919 Weilerswist-Lommersum, Derkumerstraße, HB). The statutory parametric value is 50 mg/l; the measured value represents 12 % of the parametric value. Basis: 03.11.2025 (Digital signiert), retrieved on 27/07/2026.
- Who supplies the drinking water in Erftstadt?
- Verbandswasserwerk GmbH. The values shown here come from the supply zone Entnahmestelle: HB Lommersum, Behälterausgang, Probenahmehahn (Probenahmeort: 53919 Weilerswist-Lommersum, Derkumerstraße, HB) 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.