Drinking water in Willich
12 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.
Calcitlösekapazität-Berechnung
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
11.5 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Calcitlösekapazität-Berechnung |
Show all recorded parameters (10 — most recent value per parameter)
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Calcitlösekapazität-Berechnung |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcite dissolution capacity | -4,9 mg/l | 5 mg/l CaCO3 | — | Single value · Calcitlösekapazität-Berechnung |
Further parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,47 mmol/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Base capacity to pH 8.2 | 0,0700 mmol/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Calcium | 49,3 mg/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Hardness range (WRMG) | mittel | — | — | Single value · Calcitlösekapazität-Berechnung |
| Magnesium | 19,7 mg/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Potassium | 6,40 mg/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Sum of alkaline earth metals | 2,04 mmol/l | — | — | Single value · Calcitlösekapazität-Berechnung |
| Total hardness | 11,5 °dH | — | — | Single value · Calcitlösekapazität-Berechnung |
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://stadtwerke-willich.de/wp-content/uploads/sites/2/2026/04/06315-1MH26_TRW_20260219_01.pdf · 11.03.2026 · 19.02.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Show 11 more supply zones
Calcitsättigungsberechnung (Seite 7)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
11.5 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Calcitsättigungsberechnung (Seite 7) |
| Sulphate | 99,2 mg/l | 250 mg/l | 40 % | Single value · Calcitsättigungsberechnung (Seite 7) |
| Sodium | 62,7 mg/l | 200 mg/l | 31 % | Single value · Calcitsättigungsberechnung (Seite 7) |
Show all recorded parameters (16 — most recent value per parameter)
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value · Calcitsättigungsberechnung (Seite 7) |
Indicator parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 50,4 mg/l | 250 mg/l | 20 % | Single value · Calcitsättigungsberechnung (Seite 7) |
| Conductivity (25 °C) | 712 µS/cm | 2,790 µS/cm | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Sodium | 62,7 mg/l | 200 mg/l | 31 % | Single value · Calcitsättigungsberechnung (Seite 7) |
| Sulphate | 99,2 mg/l | 250 mg/l | 40 % | Single value · Calcitsättigungsberechnung (Seite 7) |
| Temperature | 10,9 °C | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
Further parameters (10)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,47 mmol/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Acid capacity to pH 8.2 | - not determined | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Base capacity to pH 8.2 | 0,0700 mmol/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Calcium | 49,3 mg/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Hardness range (WRMG) | mittel | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Magnesium | 19,7 mg/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Phosphate | <0,10 mg/l below limit of quantification | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Potassium | 6,40 mg/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Sum of alkaline earth metals | 2,04 mmol/l | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
| Total hardness | 11,5 °dH | — | — | Single value · Calcitsättigungsberechnung (Seite 7) |
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://stadtwerke-willich.de/wp-content/uploads/sites/2/2026/04/06315-1MH26_TRW_20260219_01.pdf · 11.03.2026 · 19.02.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Gruppe A (Anlage 6 Teil I)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 MPN/100ml | 0/100 ml | — | Single value · Gruppe A (Anlage 6 Teil I) |
Show all recorded parameters (12 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 MPN/100ml | 0/100 ml | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Single value · Gruppe A (Anlage 6 Teil I) |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrite | 0,044 mg/l | 0.5 mg/l | 9 % | Single value · Gruppe A (Anlage 6 Teil I) |
Indicator parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 0,013 mg/l | 0.2 mg/l | 6 % | Single value · Gruppe A (Anlage 6 Teil I) |
| Clostridium perfringens (including spores) | - not determined Unit not stated in the document | 0/100 ml | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Conductivity (25 °C) | 712 µS/cm | 2,790 µS/cm | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Iron | <0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value · Gruppe A (Anlage 6 Teil I) |
| Odour | - not determined | für den Verbraucher annehmbar | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Temperature | 10,9 °C | — | — | Single value · Gruppe A (Anlage 6 Teil I) |
| Turbidity | <0,10 NTU below limit of quantification | 1 NTU | — | Single value · Gruppe A (Anlage 6 Teil I) |
* 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.
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | - not determined | — | — | Single value · Gruppe A (Anlage 6 Teil I) |
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://stadtwerke-willich.de/wp-content/uploads/sites/2/2026/04/06315-1MH26_TRW_20260219_01.pdf · 11.03.2026 · 19.02.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Wasserwerk Fellerhöfe
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value |
| Sulphate | 99,2 mg/l | 250 mg/l | 40 % | Single value |
| Sodium | 62,7 mg/l | 200 mg/l | 31 % | Single value |
Show all recorded parameters (82 — most recent value per parameter)
Chemical parameters (46)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,1 µg/l below limit of quantification | 3 µg/l | < 3 % * | Single value |
| Acrylamide | <0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value |
| Atrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bentazone | <0,02 µg/l below limit of quantification | — | — | Single value |
| Benzene | <0,10 µg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Boron | 0,051 mg/l | 1 mg/l | 5 % | Single value |
| Bromacil | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bromate | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value |
| Bromoxynil | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chloridazon | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chlorotoluron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chromium | <0,00050 mg/l below limit of quantification | 25 µg/l | < 2 % * | Single value |
| Cyanide | <0,0050 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Desethylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Desisopropylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dichlorprop | <0,03 µg/l below limit of quantification | — | — | Single value |
| Diflufenican | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dimethachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dimethenamid | <0,03 µg/l below limit of quantification | — | — | Single value |
| Diuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Ethidimuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Ethofumesate | <0,03 µg/l below limit of quantification | — | — | Single value |
| Flufenacet | <0,03 µg/l below limit of quantification | — | — | Single value |
| Fluoride | 0,08 mg/l | 1.5 mg/l | 5 % | Single value |
| Glyphosate | <0,03 µg/l below limit of quantification | — | — | Single value |
| Isoproturon | <0,03 µg/l below limit of quantification | — | — | Single value |
| Lenacil | <0,03 µg/l below limit of quantification | — | — | Single value |
| MCPA | <0,02 µg/l below limit of quantification | — | — | Single value |
| Mecoprop | <0,02 µg/l below limit of quantification | — | — | Single value |
| Mercury | <0,00010 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Metamitron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metazachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Methabenzthiazuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metolachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metribuzin | <0,03 µg/l below limit of quantification | — | — | Single value |
| Microcystin-LR | - not determined Unit not stated in the document | 1 µg/l | — | Single value |
| Nitrate | 21,4 mg/l | 50 mg/l | 43 % | Single value |
| Nitrite | 0,044 mg/l | 0.5 mg/l | 9 % | Single value |
| Pendimethalin | <0,03 µg/l below limit of quantification | — | — | Single value |
| Prosulfocarb | <0,03 µg/l below limit of quantification | — | — | Single value |
| Quinmerac | <0,03 µg/l below limit of quantification | — | — | Single value |
| Selenium | <0,0010 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Simazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Terbuthylazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Terbutryn | <0,03 µg/l below limit of quantification | — | — | Single value |
| Uranium | 0,0013 mg/l | 10 µg/l | 13 % | 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.
PFAS (21)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| HFPO-DA (GenX) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorobutane sulfonic acid (PFBS) | 0,005 µg/l | — | — | Single value |
| Perfluorobutanoic acid (PFBA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorodecane sulfonic acid (PFDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorodecanoic acid (PFDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorododecane sulfonic acid (PFDoDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorododecanoic acid (PFDoDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroheptane sulfonic acid (PFHpS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroheptanoic acid (PFHpA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorohexane sulfonic acid (PFHxS) | 0,002 µg/l | — | — | Single value |
| Perfluorohexanoic acid (PFHxA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorononane sulfonic acid (PFNS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorononanoic acid (PFNA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorooctanesulfonic acid (PFOS) | 0,002 µg/l | — | — | Single value |
| Perfluorooctanoic acid (PFOA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoropentanesulfonic acid (PFPeS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoropentanoic acid (PFPeA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorotridecanesulfonic acid (PFTrDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorotridecanoic acid (PFTrDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroundecanesulfonic acid (PFUnDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroundecanoic acid (PFUnDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
Indicator parameters (15)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 0,013 mg/l | 0.2 mg/l | 6 % | Single value |
| Ammonium | <0,020 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value |
| Chloride | 50,4 mg/l | 250 mg/l | 20 % | Single value |
| Colour | <0,10 m-1 below limit of quantification | 0.5 m⁻¹ | — | Single value |
| Conductivity (25 °C) | 712 µS/cm | 2,790 µS/cm | — | Single value |
| Iron | <0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value |
| Manganese | <0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Oxidisability | - not determined Unit not stated in the document | 5 mg/l O2 | — | Single value |
| Sodium | 62,7 mg/l | 200 mg/l | 31 % | Single value |
| Sulphate | 99,2 mg/l | 250 mg/l | 40 % | Single value |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value |
| Temperature | 10,9 °C | — | — | Single value |
| Threshold odour number (TON) | - not determined | — | — | Single value |
| Total organic carbon (TOC) | 0,53 mg/l | ohne anormale Veränderung | — | Single value |
| Turbidity | <0,10 NTU 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.
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://stadtwerke-willich.de/wp-content/uploads/sites/2/2026/04/06315-1MH26_TRW_20260219_01.pdf · 11.03.2026 · 19.02.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Wasserwerk Lank, Reinwasser, Entnahmehahn
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
10.4 °dH
Hardness range mittel
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 18,4 mg/l | 50 mg/l | 37 % | Single value |
| Escherichia coli (E. coli) | 0 MPN/100ml | 0/100 ml | — | Single value |
| Sulphate | 67,4 mg/l | 250 mg/l | 27 % | Single value |
| Sodium | 26,7 mg/l | 200 mg/l | 13 % | Single value |
Show all recorded parameters (99 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 MPN/100ml | 0/100 ml | — | Single value |
| Intestinal enterococci | - not determined Unit not stated in the document | 0/100 ml | — | Single value |
Chemical parameters (46)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,1 µg/l below limit of quantification | 3 µg/l | < 3 % * | Single value |
| Acrylamide | <0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value |
| Atrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bentazone | <0,02 µg/l below limit of quantification | — | — | Single value |
| Benzene | <0,10 µg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Boron | 0,034 mg/l | 1 mg/l | 3 % | Single value |
| Bromacil | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bromate | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value |
| Bromoxynil | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chloridazon | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chlorotoluron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chromium | <0,00050 mg/l below limit of quantification | 25 µg/l | < 2 % * | Single value |
| Cyanide | <0,0050 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Desethylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Desisopropylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dichlorprop | <0,03 µg/l below limit of quantification | — | — | Single value |
| Diflufenican | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dimethachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Dimethenamid | <0,03 µg/l below limit of quantification | — | — | Single value |
| Diuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Ethidimuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Ethofumesate | <0,03 µg/l below limit of quantification | — | — | Single value |
| Flufenacet | <0,03 µg/l below limit of quantification | — | — | Single value |
| Fluoride | 0,09 mg/l | 1.5 mg/l | 6 % | Single value |
| Glyphosate | <0,03 µg/l below limit of quantification | — | — | Single value |
| Isoproturon | <0,03 µg/l below limit of quantification | — | — | Single value |
| Lenacil | <0,03 µg/l below limit of quantification | — | — | Single value |
| MCPA | <0,02 µg/l below limit of quantification | — | — | Single value |
| Mecoprop | <0,02 µg/l below limit of quantification | — | — | Single value |
| Mercury | <0,00010 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Metamitron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metazachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Methabenzthiazuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metolachlor | <0,03 µg/l below limit of quantification | — | — | Single value |
| Metribuzin | <0,03 µg/l below limit of quantification | — | — | Single value |
| Microcystin-LR | - not determined Unit not stated in the document | 1 µg/l | — | Single value |
| Nitrate | 18,4 mg/l | 50 mg/l | 37 % | Single value |
| Nitrite | <0,020 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value |
| Pendimethalin | <0,03 µg/l below limit of quantification | — | — | Single value |
| Prosulfocarb | <0,03 µg/l below limit of quantification | — | — | Single value |
| Quinmerac | <0,03 µg/l below limit of quantification | — | — | Single value |
| Selenium | <0,0010 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Simazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Terbuthylazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Terbutryn | <0,03 µg/l below limit of quantification | — | — | Single value |
| Uranium | 0,00041 mg/l | 10 µg/l | 4 % | 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.
PFAS (21)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| HFPO-DA (GenX) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorobutane sulfonic acid (PFBS) | 0,010 µg/l | — | — | Single value |
| Perfluorobutanoic acid (PFBA) | 0,013 µg/l | — | — | Single value |
| Perfluorodecane sulfonic acid (PFDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorodecanoic acid (PFDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorododecane sulfonic acid (PFDoDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorododecanoic acid (PFDoDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroheptane sulfonic acid (PFHpS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroheptanoic acid (PFHpA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorohexane sulfonic acid (PFHxS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorohexanoic acid (PFHxA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorononane sulfonic acid (PFNS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorononanoic acid (PFNA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorooctanesulfonic acid (PFOS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorooctanoic acid (PFOA) | 0,002 µg/l | — | — | Single value |
| Perfluoropentanesulfonic acid (PFPeS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoropentanoic acid (PFPeA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorotridecanesulfonic acid (PFTrDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluorotridecanoic acid (PFTrDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroundecanesulfonic acid (PFUnDS) | <0,001 µg/l below limit of quantification | — | — | Single value |
| Perfluoroundecanoic acid (PFUnDA) | <0,001 µg/l below limit of quantification | — | — | Single value |
Indicator parameters (18)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 0,013 mg/l | 0.2 mg/l | 6 % | Single value |
| Ammonium | 0,031 mg/l | 0.5 mg/l | 6 % | Single value |
| Calcite dissolution capacity | -2,0 mg/l | 5 mg/l CaCO3 | — | Single value |
| Chloride | 43,0 mg/l | 250 mg/l | 17 % | Single value |
| Clostridium perfringens (including spores) | - not determined Unit not stated in the document | 0/100 ml | — | Single value |
| Colour | <0,10 m-1 below limit of quantification | 0.5 m⁻¹ | — | Single value |
| Conductivity (25 °C) | 516 µS/cm | 2,790 µS/cm | — | Single value |
| Iron | 0,009 mg/l | 0.2 mg/l | 5 % | Single value |
| Manganese | <0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Odour | - not determined | für den Verbraucher annehmbar | — | Single value |
| Oxidisability | - not determined Unit not stated in the document | 5 mg/l O2 | — | Single value |
| Sodium | 26,7 mg/l | 200 mg/l | 13 % | Single value |
| Sulphate | 67,4 mg/l | 250 mg/l | 27 % | Single value |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value |
| Temperature | 12,2 °C | — | — | Single value |
| Threshold odour number (TON) | - not determined | — | — | Single value |
| Total organic carbon (TOC) | 0,84 mg/l | ohne anormale Veränderung | — | Single value |
| Turbidity | 0,13 NTU | 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.
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | - not determined | — | — | Single value |
Further parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,16 mmol/l | — | — | Single value |
| Acid capacity to pH 8.2 | - not determined | — | — | Single value |
| Base capacity to pH 8.2 | 0,0400 mmol/l | — | — | Single value |
| Calcium | 52,7 mg/l | — | — | Single value |
| Hardness range (WRMG) | mittel | — | — | Single value |
| Magnesium | 13,0 mg/l | — | — | Single value |
| Phosphate | <0,10 mg/l below limit of quantification | — | — | Single value |
| Potassium | 4,01 mg/l | — | — | Single value |
| Saturation index | 0,13 | — | — | Single value |
| Sum of alkaline earth metals | 1,85 mmol/l | — | — | Single value |
| Total hardness | 10,4 °dH | — | — | 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://stadtwerke-meerbusch.de/wp-content/uploads/sites/3/2026/04/07261-1-MH26_Reinwasser_20260305_01.pdf · 20.03.2026 · Probenahme 05.03.2026 09:48, Analyse 05.03.2026 13:03 - 19.03.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Allgemeiner Teil
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Basekapazität-Messung
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Basekapazität-Messung (Seite 7)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Calcitsättigungsberechnung (Seite 8)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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 (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Saturation index | 0,18 | — | — | Single value · Calcitsättigungsberechnung (Seite 8) |
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://stadtwerke-willich.de/wp-content/uploads/sites/2/2026/04/06315-1MH26_TRW_20260219_01.pdf · 11.03.2026 · 19.02.2026 · retrieved on 11/07/2026
Postcodes in this zone: 47877
Ionenbilanz (Seite 6)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Ionenbilanz (Seite 8)
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Säurekapazität-Messung
Stadtwerke Service Meerbusch Willich GmbH & Co. KGAssigned 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.
Postcodes in this zone: 47877
Frequently asked questions about drinking water in Willich
- How hard is the water in Willich?
- Stadtwerke Service Meerbusch Willich GmbH & Co. KG publishes a total hardness of 11.5 °dH for the supply zone Calcitlösekapazität-Berechnung (hardness range mittel). 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: 11.03.2026, retrieved on 11/07/2026.
- How much nitrate is in the drinking water in Willich?
- Stadtwerke Service Meerbusch Willich GmbH & Co. KG publishes a nitrate value of 21,4 mg/l for the supply zone Calcitlösekapazität-Berechnung. The statutory parametric value is 50 mg/l; the measured value represents 43 % of the parametric value. Basis: 11.03.2026, retrieved on 11/07/2026.
- Who supplies the drinking water in Willich?
- Stadtwerke Service Meerbusch Willich GmbH & Co. KG. The values shown here come from the supply zone Calcitlösekapazität-Berechnung 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.