Drinking water in 77731
For this postcode Gemeinde Willstätt 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 3 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.
ON Willstätt, Bauhof
Gemeinde WillstättAssigned 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 22/07/2025. 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.
Water hardness
Hardness range 6,3
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,0053 µg/L | — | — | Single value · Source [1] |
| Nitrate | < BG mg/L below limit of quantification | 50 mg/l | < 1 % * | Single value · Source [1] |
| Lead | < BG mg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Source [1] |
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · ON Willstätt, Bauhof · Source [2] |
| Sulphate | 13,1 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
| Sodium | 7,1 mg/L | 200 mg/l | 4 % | Single value · 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 (114 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · ON Willstätt, Bauhof · Source [2] |
| Intestinal enterococci | 0 in 100 mL | 0/100 ml | — | Single value · ON Willstätt, Bauhof · Source [2] |
Chemical parameters (62)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < BG µg/L below limit of quantification | 3 µg/l | < 3 % * | Single value · Source [1] |
| 2,6-Dichlorobenzamide (BAM) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Alachlor | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Ametryn | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Antimony | < BG mg/L below limit of quantification | 5 µg/l | < 20 % * | Single value · Source [1] |
| Arsenic | 0,006 mg/L | 10 µg/l | 60 % | Single value · Source [1] |
| Atrazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Benzene | < BG µg/L below limit of quantification | 1 µg/l | < 10 % * | Single value · Source [1] |
| Benzo(a)pyrene | < BG µg/L below limit of quantification | 10 ng/l | < 20 % * | Single value · Source [1] |
| Benzo(b)fluoranthene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Benzo(ghi)perylene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Benzo(k)fluoranthene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Bisphenol A | < BG µg/L below limit of quantification | 2.5 µg/l | < 0.2 % * | Single value · Source [1] |
| Boron | 0,03 mg/L | 1 mg/l | 3 % | Single value · Source [1] |
| Bromacil | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Cadmium | < BG mg/L below limit of quantification | 3 µg/l | < 3 % * | Single value · Source [1] |
| Carbetamide | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Chloridazon | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Chlorotoluron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Chromium | < BG mg/L below limit of quantification | 25 µg/l | < 2 % * | Single value · Source [1] |
| Copper | < BG mg/L below limit of quantification | 2 mg/l | < 0.5 % * | Single value · Source [1] |
| Cyanazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Cyanide | < BG mg/L below limit of quantification | 50 µg/l | < 20 % * | Single value · Source [1] |
| Desethylatrazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Desethylsimazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Desethylterbuthylazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Desmetryn | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Diuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Fluoride | 0,10 mg/L | 1.5 mg/l | 7 % | Single value · Source [1] |
| Hexazinone | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Indeno(1,2,3-cd)pyrene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Isoproturon | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Lead | < BG mg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Source [1] |
| Lenacil | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Linuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Mercury | < BG mg/L below limit of quantification | 1 µg/l | < 5 % * | Single value · Source [1] |
| Metalaxyl | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Metamitron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Metazachlor | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Methabenzthiazuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Metobromuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Metoxuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Metribuzin | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Monolinuron | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Nickel | 0,001 mg/L | 20 µg/l | 5 % | Single value · Source [1] |
| Nitrate | < BG mg/L below limit of quantification | 50 mg/l | < 1 % * | Single value · Source [1] |
| Nitrite | < BG mg/L below limit of quantification | 0.5 mg/l | < 2 % * | Single value · Source [1] |
| Pendimethalin | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Prometryn | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Propazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Sebuthylazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Selenium | < BG mg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Source [1] |
| Simazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Terbuthylazine | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Terbutryn | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Tetrachloroethene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Tetrachloroethene and Trichloroethene (sum) | 0,000 µg/L | 10 µg/l | 0 % | Single value · Source [1] |
| Tri-allate | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Triadimenol | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Trichloroethene | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Trifluralin | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Uranium | < BG mg/L below limit of quantification | 10 µg/l | < 1 % * | Single value · 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) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorobutanoic acid (PFBA) | 0,0022 µg/L | — | — | Single value · Source [1] |
| Perfluorodecane sulfonic acid (PFDS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorodecanoic acid (PFDA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorododecane sulfonic acid (PFDoDS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorododecanoic acid (PFDoDA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoroheptane sulfonic acid (PFHpS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoroheptanoic acid (PFHpA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorohexane sulfonic acid (PFHxS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorohexanoic acid (PFHxA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorononane sulfonic acid (PFNS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorononanoic acid (PFNA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorooctanesulfonic acid (PFOS) | 0,0031 µg/L | — | — | Single value · Source [1] |
| Perfluorooctanoic acid (PFOA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoropentanesulfonic acid (PFPeS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoropentanoic acid (PFPeA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorotridecanesulfonic acid (PFTrDS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluorotridecanoic acid (PFTrDA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoroundecanesulfonic acid (PFUnDS) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Perfluoroundecanoic acid (PFUnDA) | < BG µg/L below limit of quantification | — | — | Single value · Source [1] |
| Sum of 4 PFAS | 0,0031 µg/L | — | — | Single value · Source [1] |
| Sum of PFAS | 0,0053 µg/L | — | — | Single value · Source [1] |
Indicator parameters (16)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < BG mg/L below limit of quantification | 0.2 mg/l | < 10 % * | Single value · Source [1] |
| Ammonium | < BG mg/L below limit of quantification | 0.5 mg/l | < 2 % * | Single value · Source [1] |
| Calcite dissolution capacity | < BG mg/L below limit of quantification | 5 mg/l CaCO3 | — | Single value · Source [1] |
| Chloride | 13,0 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
| Coliform bacteria | 0 in 100 mL | 0/100 ml | — | Single value · ON Willstätt, Bauhof · Source [2] |
| Colour | ohne - | 0.5 m⁻¹ | — | Single value · Source [1] |
| Conductivity (25 °C) | 262 µS/cm | 2,790 µS/cm | — | Single value · Source [1] |
| Iron | 0,02 mg/L | 0.2 mg/l | 10 % | Single value · Source [1] |
| Manganese | < BG mg/L below limit of quantification | 50 µg/l | < 10 % * | Single value · Source [1] |
| Odour | ohne - | für den Verbraucher annehmbar | — | Single value · Source [1] |
| pH | 8,06 - | 6,5–9,5 | — | Single value · Source [1] |
| Sodium | 7,1 mg/L | 200 mg/l | 4 % | Single value · Source [1] |
| Sulphate | 13,1 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
| Taste | ohne - | für den Verbraucher annehmbar | — | Single value · Source [1] |
| Total organic carbon (TOC) | 1,2 mg/L | ohne anormale Veränderung | — | Single value · Source [1] |
| Turbidity | - FNU not determined | 1 NTU | — | Single value · 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 (12)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,01 mmol/L | — | — | Single value · Source [1] |
| Base capacity to pH 8.2 | 0,023 mmol/L | — | — | Single value · Source [1] |
| Calcite precipitation capacity | 3 mg/L | — | — | Single value · Source [1] |
| Calcium | 40,3 mg/L | — | — | Single value · Source [1] |
| Hardness range (WRMG) | 6,3 ° dH | — | — | Single value · Source [1] |
| Magnesium | 2,9 mg/L | — | — | Single value · Source [1] |
| Oxygen | 9,2 mg/L | — | — | Single value · Source [1] |
| Phosphate | 0,10 mg/L | — | — | Single value · Source [1] |
| Potassium | 1,8 mg/L | — | — | Single value · Source [1] |
| Saturation index | 0,20 - | — | — | Single value · Source [1] |
| Silicate / silicic acid | 12,6 mg/L | — | — | Single value · Source [1] |
| Spectral absorption coefficient 254 nm (SAC 254) | 1,8 1/m | — | — | Single value · 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://www.willstaett.de/ceasy/resource/?id=4589&download=1 · Untersuchungsende, Karlsruhe, den 09.05.2025 · Einzelprobe vom 07.04.2025 · retrieved on 18/08/2026 [2] https://www.willstaett.de/ceasy/resource/?id=4587&download=1 · 24.07.2025 · 22.07.2025 · retrieved on 18/08/2026
Show 3 more supply zones in this postcode
Wasserwerk Spittelschlag, Ausgang
Gemeinde WillstättAssigned 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 22/07/2025. 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.
Water hardness
Hardness range 6,0
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | < BG mg/L not detectable | 50 mg/l | — | Single value · Source [1] |
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · Wasserwerk Spittelschlag, Ausgang · Source [2] |
| Sulphate | 13,2 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
| Sodium | 7,1 mg/L | 200 mg/l | 4 % | Single value · Source [1] |
Show all recorded parameters (17 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · Wasserwerk Spittelschlag, Ausgang · Source [2] |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | < BG mg/L not detectable | 50 mg/l | — | Single value · Source [1] |
Indicator parameters (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcite dissolution capacity | 1 mg/L | 5 mg/l CaCO3 | — | Single value · Source [1] |
| Chloride | 13,2 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
| Coliform bacteria | 0 in 100 mL | 0/100 ml | — | Single value · Wasserwerk Spittelschlag, Ausgang · Source [2] |
| Conductivity (25 °C) | 259 µS/cm | 2,790 µS/cm | — | Single value · Source [1] |
| Sodium | 7,1 mg/L | 200 mg/l | 4 % | Single value · Source [1] |
| Sulphate | 13,2 mg/L | 250 mg/l | 5 % | Single value · Source [1] |
Further parameters (9)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 1,97 mmol/L | — | — | Single value · Source [1] |
| Acid capacity to pH 8.2 | - mmol/L not determined | — | — | Single value · Source [1] |
| Base capacity to pH 8.2 | 0,066 mmol/L | — | — | Single value · Source [1] |
| Calcite precipitation capacity | < BG mg/L not detectable | — | — | Single value · Source [1] |
| Calcium | 38,1 mg/L | — | — | Single value · Source [1] |
| Hardness range (WRMG) | 6,0 ° dH | — | — | Single value · Source [1] |
| Magnesium | 2,9 mg/L | — | — | Single value · Source [1] |
| Potassium | 1,7 mg/L | — | — | Single value · Source [1] |
| Saturation index | -0,10 - | — | — | Single value · 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://www.willstaett.de/ceasy/resource/?id=4588&download=1 · 31.07.2025 · 22.07.2025 · retrieved on 18/08/2026 [2] https://www.willstaett.de/ceasy/resource/?id=4587&download=1 · 24.07.2025 · 22.07.2025 · retrieved on 18/08/2026
ON Legelshurst, KiGa Urloffenstr. 5
Gemeinde WillstättAssigned 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 22/07/2025. 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 |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · ON Legelshurst, KiGa Urloffenstr. 5 |
Show all recorded parameters (3 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · ON Legelshurst, KiGa Urloffenstr. 5 |
| Intestinal enterococci | 0 in 100 mL | 0/100 ml | — | Single value · ON Legelshurst, KiGa Urloffenstr. 5 |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Coliform bacteria | 0 in 100 mL | 0/100 ml | — | Single value · ON Legelshurst, KiGa Urloffenstr. 5 |
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.willstaett.de/ceasy/resource/?id=4587&download=1 · 24.07.2025 · 22.07.2025 · retrieved on 18/08/2026
Ortsnetz Sand, KiGa Blumenstraße 15
Gemeinde WillstättAssigned 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 22/07/2025. 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 |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · Ortsnetz Sand, KiGa Blumenstraße 15 |
Show all recorded parameters (2 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 in 100 mL | 0/100 ml | — | Single value · Ortsnetz Sand, KiGa Blumenstraße 15 |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Coliform bacteria | 0 in 100 mL | 0/100 ml | — | Single value · Ortsnetz Sand, KiGa Blumenstraße 15 |
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.willstaett.de/ceasy/resource/?id=4587&download=1 · 24.07.2025 · 22.07.2025 · retrieved on 18/08/2026
Frequent questions about postcode 77731
- How hard is the water in Postcode 77731?
- Gemeinde Willstätt publishes the hardness range 6,3 for the supply zone ON Willstätt, Bauhof. 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: Untersuchungsende, Karlsruhe, den 09.05.2025, retrieved on 18/08/2026.
- How much nitrate is in the drinking water in Postcode 77731?
- Gemeinde Willstätt publishes a nitrate value of < BG mg/L for the supply zone ON Willstätt, Bauhof. The statutory parametric value is 50 mg/l; the measured value lies below it and cannot be specified more precisely below the limit of quantification. Basis: Untersuchungsende, Karlsruhe, den 09.05.2025, retrieved on 18/08/2026.
- Who supplies the drinking water in Postcode 77731?
- Gemeinde Willstätt. The values shown here come from the supply zone ON Willstätt, Bauhof 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.