Drinking water in 31135
For this postcode EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse) 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 1 underneath.
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.
WW Söse I (Nord) / Reinwasser
EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse)Assigned 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 | 7.6 mg/l | 50 mg/l | 15 % | Mean |
| Lead | <0.001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Escherichia coli (E. coli) | 0 / 100 ml | 0/100 ml | — | Maximum · Median 0 |
| Sulphate | 16.3 mg/l | 250 mg/l | 7 % | Mean |
| Sodium | 0.217 mmol/l | 200 mg/l | — | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (65 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 / 100 ml | 0/100 ml | — | Maximum · Median 0 |
| Intestinal enterococci | 0 / 100 ml | 0/100 ml | — | Maximum · Median 0 |
Chemical parameters (29)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0.0001 mg/l below limit of quantification | 3 µg/l | < 3 % * | Mean |
| 2,6-Dichlorobenzamide (BAM) | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Antimony | <0.0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Mean |
| Arsenic | <0.0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Benzene | <0.0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Benzo(a)pyrene | <0.00001 mg/l below limit of quantification | 10 ng/l | < 100 % * | Mean |
| Bisphenol A | <0.0001 mg/l below limit of quantification | 2.5 µg/l | < 4 % * | Mean |
| Boron | <0.05 mg/l below limit of quantification | 1 mg/l | < 5 % * | Mean |
| Bromate | <0.01 mg/l below limit of quantification | 10 µg/l | < 100 % * | Mean |
| Cadmium | <0.001 mg/l below limit of quantification | 3 µg/l | < 33 % * | Mean |
| Chlorite | n.b. mg/l not determined | 0.2 mg/l | — | Mean |
| Chromium | <0.001 mg/l below limit of quantification | 25 µg/l | < 4 % * | Mean |
| Copper | 0.0011 mg/l | 2 mg/l | < 0.1 % | Mean |
| Cyanide | <0.001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean |
| Dimethachlor sulfonic acid | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Fluoride | 0.04 mg/l | 1.5 mg/l | 3 % | Mean |
| Lead | <0.001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Mercury | <0.0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Metazachlor acid | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Metazachlor sulfonic acid | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Metolachlor acid | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Metolachlor sulfonic acid | <0.000025 mg/l below limit of quantification | — | — | Mean |
| Nickel | <0.001 mg/l below limit of quantification | 20 µg/l | < 5 % * | Mean |
| Nitrate | 7.6 mg/l | 50 mg/l | 15 % | Mean |
| Nitrite | 0.002 mg/l | 0.5 mg/l | 0.4 % | Mean |
| Polycyclic aromatic hydrocarbons | <0.0001 mg/l below limit of quantification | 0.1 µg/l | < 100 % * | Mean |
| Selenium | <0.0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Mean |
| Tetrachloromethane | <0.0001 mg/l below limit of quantification | — | — | Mean |
| Uranium | <0.0001 mg/l below limit of quantification | 10 µg/l | < 1 % * | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Trifluoroacetic acid (TFA) | 0.000553 mg/l | 60 µg/l UBA guide value | 0.9 % | Mean |
For trifluoroacetic acid (TFA), the German Drinking Water Ordinance does not specify a parametric value. The comparison is therefore made with the guide value of 60 µg/l issued by the Umweltbundesamt, which has replaced the earlier health-related guidance value of 3 µg/l. A guide value is not a legal maximum but a health-related classification.
Indicator parameters (19)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | 0.010 mg/l | 0.2 mg/l | 5 % | Mean |
| Ammonium | <0.03 mg/l below limit of quantification | 0.5 mg/l | < 6 % * | Mean |
| Calcite dissolution capacity | 0.8 mg/l | 5 mg/l CaCO3 | — | Mean |
| Chloride | 6.4 mg/l | 250 mg/l | 3 % | Mean |
| Clostridium perfringens (including spores) | 0 / 100 ml | 0/100 ml | — | Maximum · Median 0 |
| Coliform bacteria | 0 / 100 ml | 0/100 ml | — | Maximum · Median 0 |
| Colony count 22 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 /ml | ohne anormale Veränderung | — | Mean |
| Colour | 0.05 /m | 0.5 m⁻¹ | — | Mean |
| Iron | <0.001 mg/l below limit of quantification | 0.2 mg/l | < 0.5 % * | Mean |
| Manganese | <0.001 mg/l below limit of quantification | 50 µg/l | < 2 % * | Mean |
| pH | 9.12 | 6,5–9,5 | — | Mean |
| Sodium | 0.217 mmol/l | 200 mg/l | — | Mean |
| Sulphate | 16.3 mg/l | 250 mg/l | 7 % | Mean |
| Taste | ohne qualitativ | für den Verbraucher annehmbar | — | Mean |
| Temperature | 7.9 °C | — | — | Mean |
| Threshold odour number (TON) | 1 | — | — | Mean |
| Total organic carbon (TOC) | 1.3 mg/l | ohne anormale Veränderung | — | Mean |
| Turbidity | 0.04 FTU | 1 NTU | — | Mean |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Treatment substances (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Chlorine dioxide | n.b. mg/l not determined | — | — | Mean |
| Total chlorine | 0.13 mg/l | — | — | Mean |
Further parameters (12)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Barium | 0.04 mg/l | — | — | Mean |
| Calcium | 0.244 mmol/l | — | — | Mean |
| Carbonate hardness | 1.2 °dH | — | — | Mean |
| Hardness range (WRMG) | weich | — | — | Mean |
| Magnesium | 0.086 mmol/l | — | — | Mean |
| Oxygen | 11.5 mg/l | — | — | Mean |
| Phosphate | <0.005 mg/l below limit of quantification | — | — | Mean |
| Potassium | 0.022 mmol/l | — | — | Mean |
| Silicate / silicic acid | 2.9 mg/l | — | — | Mean |
| Sum of alkaline earth metals | 0.330 mmol/l | — | — | Mean |
| Total hardness | 1.8 °dH | — | — | Mean |
| Zinc | 0.005 mg/l | — | — | Mean |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Show 1 more supply zone in this postcode
Stadt Hildesheim und Ortschaften Einum, Achtum, Uppen, Bavenstedt, Sorsum, Neuhof und Marienrode
EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse)Assigned 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 KBE/100ml | 0/100 ml | — | Single value |
Show all recorded parameters (6 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Single value |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Single value |
Indicator parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 9,12 | 6,5–9,5 | — | Mean |
| Temperature | 7,9 | — | — | Mean |
Further parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Oxygen | 11,5 | — | — | Mean |
| Total hardness | 1,8 | — | — | Mean |
Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.
Frequent questions about postcode 31135
- How hard is the water in Postcode 31135?
- EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse) publishes a total hardness of 1.8 °dH for the supply zone WW Söse I (Nord) / Reinwasser (hardness range weich). 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: Publication by the water supplier, retrieved on 11/07/2026.
- How much nitrate is in the drinking water in Postcode 31135?
- EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse) publishes a nitrate value of 7.6 mg/l for the supply zone WW Söse I (Nord) / Reinwasser. The statutory parametric value is 50 mg/l; the measured value represents 15 % of the parametric value. Basis: Publication by the water supplier, retrieved on 11/07/2026.
- Who supplies the drinking water in Postcode 31135?
- EVI Energieversorgung Hildesheim GmbH & Co. KG (Vorlieferant: Harzwasserwerke, Talsperren Grane/Söse). The values shown here come from the supply zone WW Söse I (Nord) / Reinwasser 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.