Drinking water in Römerswil LU
5 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
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.
Cham Hagendorn und Hünenberg
WWZ AGAssigned 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 | 14.89 mg/l | 40 mg/l | 37 % | Mean · Cham Hagendorn und Hünenberg |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Cham Hagendorn und Hünenberg |
| Sulphate | 18.38 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Sodium | 5.95 mg/l | 200 mg/l | 3 % | Mean · Cham Hagendorn und Hünenberg |
Show all recorded parameters (21 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 17 KBE/ml | 300 1/ml | — | Mean · Cham Hagendorn und Hünenberg |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Cham Hagendorn und Hünenberg |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Cham Hagendorn und Hünenberg |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 14.89 mg/l | 40 mg/l | 37 % | Mean · Cham Hagendorn und Hünenberg |
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | < 0.002 µg/l below limit of quantification | 0.3 µg/l | < 0.7 % * | Mean · Cham Hagendorn und Hünenberg |
| Perfluorooctanesulfonic acid (PFOS) | < 0.001 µg/l below limit of quantification | 0.3 µg/l | < 0.3 % * | Mean · Cham Hagendorn und Hünenberg |
| Perfluorooctanoic acid (PFOA) | < 0.001 µg/l below limit of quantification | 0.5 µg/l | < 0.2 % * | Mean · Cham Hagendorn und Hünenberg |
* 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.
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | 0.02 µg/l | 0.1 µg/l | 20 % | Mean · Cham Hagendorn und Hünenberg |
| Chlorothalonil metabolite R471811 | 0.04 µg/l | 0.1 µg/l | 40 % | Mean · Cham Hagendorn und Hünenberg |
Indicator parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 7.15 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Conductivity (25 °C) | 462.83 µS/cm | — | — | Mean · Cham Hagendorn und Hünenberg |
| Iron | 0.01 mg/l | 0.2 mg/l | 5 % | Mean · Cham Hagendorn und Hünenberg |
| Manganese | 0 mg/l | 50 µg/l | 0 % | Mean · Cham Hagendorn und Hünenberg |
| pH | 7.39 | — | — | Mean · Cham Hagendorn und Hünenberg |
| Sodium | 5.95 mg/l | 200 mg/l | 3 % | Mean · Cham Hagendorn und Hünenberg |
| Sulphate | 18.38 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Turbidity | 0.14 TE/F | — | — | Mean · Cham Hagendorn und Hünenberg |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 90.8 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Magnesium | 8.43 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Potassium | 2.66 mg/l | — | — | Mean · Cham Hagendorn und Hünenberg |
| Total hardness | 26.1 °fH | — | — | Mean · Cham Hagendorn und Hünenberg |
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.
Postcodes in this zone: 6027
Show 4 more supply zones
Hochdorf
WWZ AGAssigned 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 | 27.9 mg/l | 40 mg/l | 70 % | Mean · Hochdorf |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Hochdorf |
| Sulphate | 15.2 mg/l | — | — | Mean · Hochdorf |
| Sodium | 10 mg/l | 200 mg/l | 5 % | Mean · Hochdorf |
Show all recorded parameters (22 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 4 KBE/ml | 300 1/ml | — | Mean · Hochdorf |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Hochdorf |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Hochdorf |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 27.9 mg/l | 40 mg/l | 70 % | Mean · Hochdorf |
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | < 0.001 µg/l below limit of quantification | 0.3 µg/l | < 0.3 % * | Mean · Hochdorf |
| Perfluorooctanesulfonic acid (PFOS) | < 0.001 µg/l below limit of quantification | 0.3 µg/l | < 0.3 % * | Mean · Hochdorf |
| Perfluorooctanoic acid (PFOA) | < 0.001 µg/l below limit of quantification | 0.5 µg/l | < 0.2 % * | Mean · Hochdorf |
* 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.
Metabolites (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorothalonil metabolite R417888 | 0.03 µg/l | 0.1 µg/l | 30 % | Mean · Hochdorf |
| Chlorothalonil metabolite R471811 | 0.34 µg/l | 0.1 µg/l | 340 % Mean above the parametric value | Mean · Hochdorf |
Annual means and medians are not individual measured values, but the parametric values apply per sample. If a mean lies above it, at least one individual sample was above it — the mean does not say how many, or by how much. That is why this is not reported here as an exceedance of the parametric value. What counts remains the water supplier's publication, which each row links to.
Indicator parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 17.7 mg/l | — | — | Mean · Hochdorf |
| Conductivity (25 °C) | 750 µS/cm | — | — | Mean · Hochdorf |
| Oxidisability | 1 mg KMnO4/l | — | — | Mean · Hochdorf |
| pH | 7.17 | — | — | Mean · Hochdorf |
| Sodium | 10 mg/l | 200 mg/l | 5 % | Mean · Hochdorf |
| Sulphate | 15.2 mg/l | — | — | Mean · Hochdorf |
| Temperature | 12.5 °C | — | — | Mean · Hochdorf |
| Turbidity | 0.22 TE/F | — | — | Mean · Hochdorf |
Further parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 134.5 mg/l | — | — | Mean · Hochdorf |
| Hydrogen carbonate | 428 mg/l | — | — | Mean · Hochdorf |
| Magnesium | 13.1 mg/l | — | — | Mean · Hochdorf |
| Potassium | 1.8 mg/l | — | — | Mean · Hochdorf |
| Total hardness | 38.9 °fH | — | — | Mean · Hochdorf |
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.
Postcodes in this zone: 6027
Römerswil
WWZ AGAssigned 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 | 32.5 mg/l | 40 mg/l | 81 % | Mean · Römerswil |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Römerswil |
| Sulphate | 18.75 mg/l | — | — | Mean · Römerswil |
Show all recorded parameters (12 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 1.25 KBE/ml | 300 1/ml | — | Mean · Römerswil |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Römerswil |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Römerswil |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 32.5 mg/l | 40 mg/l | 81 % | Mean · Römerswil |
Indicator parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 19.75 mg/l | — | — | Mean · Römerswil |
| Sulphate | 18.75 mg/l | — | — | Mean · Römerswil |
| Temperature | 11.8 °C | — | — | Mean · Römerswil |
| Turbidity | 0.12 TE/F | — | — | Mean · Römerswil |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 135.5 mg/l | — | — | Mean · Römerswil |
| Hydrogen carbonate | 433 mg/l | — | — | Mean · Römerswil |
| Magnesium | 15.5 mg/l | — | — | Mean · Römerswil |
| Total hardness | 40.15 °fH | — | — | Mean · Römerswil |
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.
Postcodes in this zone: 6027
Walterswil Sihlbrugg
WWZ AGAssigned 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 | 13.37 mg/l | 40 mg/l | 33 % | Mean · Walterswil Sihlbrugg |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Walterswil Sihlbrugg |
| Sulphate | 7.3 mg/l | — | — | Mean · Walterswil Sihlbrugg |
Show all recorded parameters (14 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 7.6 KBE/ml | 300 1/ml | — | Mean · Walterswil Sihlbrugg |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Walterswil Sihlbrugg |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Walterswil Sihlbrugg |
Chemical parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Fluoride | 0.06 mg/l | 1.5 mg/l | 4 % | Mean · Walterswil Sihlbrugg |
| Nitrate | 13.37 mg/l | 40 mg/l | 33 % | Mean · Walterswil Sihlbrugg |
Indicator parameters (5)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 4.06 mg/l | — | — | Mean · Walterswil Sihlbrugg |
| Conductivity (25 °C) | 501 µS/cm | — | — | Mean · Walterswil Sihlbrugg |
| pH | 7.57 | — | — | Mean · Walterswil Sihlbrugg |
| Sulphate | 7.3 mg/l | — | — | Mean · Walterswil Sihlbrugg |
| Temperature | 11.3 °C | — | — | Mean · Walterswil Sihlbrugg |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 86.8 mg/l | — | — | Mean · Walterswil Sihlbrugg |
| Dissolved organic carbon (DOC) | 0.26 mg/l | — | — | Mean · Walterswil Sihlbrugg |
| Magnesium | 17.78 mg/l | — | — | Mean · Walterswil Sihlbrugg |
| Total hardness | 29 °fH | — | — | Mean · Walterswil Sihlbrugg |
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.
Postcodes in this zone: 6027
Zug
WWZ AGAssigned 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 | 8.3 mg/l | 40 mg/l | 21 % | Mean · Zug |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Zug |
| Sulphate | 8.5 mg/l | — | — | Mean · Zug |
| Sodium | 10.1 mg/l | 200 mg/l | 5 % | Mean · Zug |
Show all recorded parameters (18 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 11.6 KBE/ml | 300 1/ml | — | Mean · Zug |
| Escherichia coli (E. coli) | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Zug |
| Intestinal enterococci | nn not detectable Unit not stated in the document | 0/100 ml | — | Maximum · Median nn · Zug |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 8.3 mg/l | 40 mg/l | 21 % | Mean · Zug |
PFAS (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorohexane sulfonic acid (PFHxS) | < 0.001 µg/l below limit of quantification | 0.3 µg/l | < 0.3 % * | Mean · Zug |
| Perfluorooctanesulfonic acid (PFOS) | < 0.001 µg/l below limit of quantification | 0.3 µg/l | < 0.3 % * | Mean · Zug |
| Perfluorooctanoic acid (PFOA) | < 0.001 µg/l below limit of quantification | 0.5 µg/l | < 0.2 % * | Mean · Zug |
* 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 (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chloride | 12.13 mg/l | — | — | Mean · Zug |
| Conductivity (25 °C) | 439.57 µS/cm | — | — | Mean · Zug |
| Iron | 0.02 mg/l | 0.2 mg/l | 10 % | Mean · Zug |
| pH | 7.48 | — | — | Mean · Zug |
| Sodium | 10.1 mg/l | 200 mg/l | 5 % | Mean · Zug |
| Sulphate | 8.5 mg/l | — | — | Mean · Zug |
| Turbidity | 0.15 TE/F | — | — | Mean · Zug |
Further parameters (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 76.5 mg/l | — | — | Mean · Zug |
| Magnesium | 14.1 mg/l | — | — | Mean · Zug |
| Potassium | 1.7 mg/l | — | — | Mean · Zug |
| Total hardness | 24.8 °fH | — | — | Mean · Zug |
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.
Postcodes in this zone: 6027
Frequently asked questions about drinking water in Römerswil LU
- How hard is the water in Römerswil LU?
- WWZ AG publishes a total hardness of 26.1 °fH for the supply zone Cham Hagendorn und Hünenberg — that corresponds to 14.6 °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: 2025, retrieved on 07/08/2026.
- How much nitrate is in the drinking water in Römerswil LU?
- WWZ AG publishes a nitrate value of 14.89 mg/l for the supply zone Cham Hagendorn und Hünenberg. The statutory parametric value is 40 mg/l; the measured value represents 37 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
- Who supplies the drinking water in Römerswil LU?
- WWZ AG. The values shown here come from the supply zone Cham Hagendorn und Hünenberg 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.