Drinking water in Heidelberg
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.
Heidelberg Hartwasserzone südlich des Neckars (versorgt durch Wasserwerke Rauschen, Schwetzinger Hardt und Neckargruppe)
Stadtwerke Heidelberg Energie GmbH / Stadtwerke Heidelberg NetzeAssigned 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 |
|---|---|---|---|---|
| Sum of PFAS | 0,018 µg/l | 0.1 µg/l | 18 % | Mean |
| Nitrate | 14 mg/l | 50 mg/l | 28 % | Mean |
| Lead | <1 µg//l below limit of quantification | 10 µg/l | — | Mean |
| Escherichia coli (E. coli) | 0 KBE/100 ml | 0/100 ml | — | Maximum · Median 0 |
| Sulphate | 83 mg/l | 250 mg/l | 33 % | Mean |
| Sodium | 25 mg/l | 200 mg/l | 13 % | Mean |
Show all recorded parameters (66 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 KBE/100 ml | 0/100 ml | — | Maximum · Median 0 |
| Intestinal enterococci | 0 KBE/100 ml | 0/100 ml | — | Maximum · Median 0 |
Chemical parameters (22)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,9 µg/l below limit of quantification | 3 µg/l | < 30 % * | Mean |
| Antimony | <0,5 µg/l below limit of quantification | 5 µg/l | < 10 % * | Mean |
| Arsenic | <1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Benzene | <0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Mean |
| Benzo(a)pyrene | <0,003 µg/l below limit of quantification | 10 ng/l | < 30 % * | Mean |
| Bisphenol A | <0,005 µg/l below limit of quantification | 2.5 µg/l | < 0.2 % * | Mean |
| Boron | 0,06 mg/l | 1 mg/l | 6 % | Mean |
| Cadmium | <0,5 µg/l below limit of quantification | 3 µg/l | < 17 % * | Mean |
| Chromium | <2 µg/l below limit of quantification | 25 µg/l | < 8 % * | Mean |
| Copper | <0,002 mg/l below limit of quantification | 2 mg/l | < 0.1 % * | Mean |
| Cyanide | <5 µg/l below limit of quantification | 50 µg/l | < 10 % * | Mean |
| Fluoride | <0,15 mg/l below limit of quantification | 1.5 mg/l | < 10 % * | Mean |
| Lead | <1 µg//l below limit of quantification | 10 µg/l | — | Mean |
| Mercury | <0,1 µg/l below limit of quantification | 1 µg/l | < 10 % * | Mean |
| Nickel | <2 µg/l below limit of quantification | 20 µg/l | < 10 % * | Mean |
| Nitrate | 14 mg/l | 50 mg/l | 28 % | Mean |
| Nitrite | <0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Mean |
| Pesticides — Total | < Bestimmungsgrenzen µg/l not detectable | 0.5 µg/l | — | Mean |
| Polycyclic aromatic hydrocarbons | < Bestimmungsgrenzen µg/l not detectable | 0.1 µg/l | — | Mean |
| Selenium | <1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Mean |
| Trihalomethanes — Total | <0,1 µg/l below limit of quantification | 50 µg/l | < 0.2 % * | Mean |
| Uranium | 0,5 µg/l | 10 µg/l | 5 % | 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 (16)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Perfluorobutane sulfonic acid (PFBS) | 0,003 µg/l | — | — | Mean |
| Perfluorobutanoic acid (PFBA) | 0,003 µg/l | — | — | Mean |
| Perfluorodecane sulfonic acid (PFDS) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluorodecanoic acid (PFDA) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluoroheptane sulfonic acid (PFHpS) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluoroheptanoic acid (PFHpA) | 0,001 µg/l | — | — | Mean |
| Perfluorohexane sulfonic acid (PFHxS) | 0,001 µg/l | — | — | Mean |
| Perfluorohexanoic acid (PFHxA) | 0,001 µg/l | — | — | Mean |
| Perfluorononane sulfonic acid (PFNS) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluorononanoic acid (PFNA) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluorooctanesulfonic acid (PFOS) | 0,005 µg/l | — | — | Mean |
| Perfluorooctanoic acid (PFOA) | 0,002 µg/l | — | — | Mean |
| Perfluoropentanesulfonic acid (PFPeS) | <0,001 µg/l below limit of quantification | — | — | Mean |
| Perfluoropentanoic acid (PFPeA) | 0,002 µg/l | — | — | Mean |
| Sum of 4 PFAS | 0,008 µg/l | — | — | Mean |
| Sum of PFAS | 0,018 µg/l | 0.1 µg/l | 18 % | Mean |
Indicator parameters (19)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Mean |
| Ammonium | <0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Mean |
| Calcite dissolution capacity | -13,3 mg/l | 5 mg/l CaCO3 | — | Mean |
| Chloride | 42 mg/l | 250 mg/l | 17 % | Mean |
| Coliform bacteria | 0 KBE/100 ml | 0/100 ml | — | Maximum · Median 0 |
| Colony count 22 °C | 0 KBE/ml | ohne anormale Veränderung | — | Mean |
| Colony count 36 °C | 0 KBE/ ml | ohne anormale Veränderung | — | Mean |
| Colour | <0,1 1/m below limit of quantification | 0.5 m⁻¹ | — | Mean |
| Conductivity (25 °C) | 774 µS/cm | 2,790 µS/cm | — | Mean |
| Iron | 0,01 mg/l | 0.2 mg/l | 5 % | Mean |
| Manganese | <2 µg/l below limit of quantification | 50 µg/l | < 4 % * | Mean |
| Odour | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Mean |
| pH | 7,3 - | 6,5–9,5 | — | Mean |
| Sodium | 25 mg/l | 200 mg/l | 13 % | Mean |
| Sulphate | 83 mg/l | 250 mg/l | 33 % | Mean |
| Taste | ohne anormale Veränderung | für den Verbraucher annehmbar | — | Mean |
| Temperature | 13,4 °C | — | — | Mean |
| Total organic carbon (TOC) | 1 mg/l | ohne anormale Veränderung | — | Mean |
| Turbidity | <0,1 NTU below limit of quantification | 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.
Further parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 5,2 mmol/l | — | — | Mean |
| Base capacity to pH 8.2 | 0,6 mmol/l | — | — | Mean |
| Calcium | 104 mg/l | — | — | Mean |
| Hydrogen carbonate | 315 mg/l | — | — | Mean |
| Magnesium | 18 mg/l | — | — | Mean |
| Potassium | 3 mg/l | — | — | Mean |
| Sum of alkaline earth metals | 19,8 °dH | — | — | 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.
Source: https://www.swhd.de/de/Hauptnavigation/Privatkunden/Wasser/Wasseranalyse/Hartwasser-suedlich-des-Neckar.pdf · 28.01.2026 · retrieved on 11/07/2026
Postcodes in this zone: 69115 , 69117 , 69118 , 69120 , 69121 , 69124 , 69126
Show 1 more supply zone
Wasserwerk Schwetzinger Hardt
Zweckverband Wasserversorgung Kurpfalz (ZWK)Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
17.9 °dH
Hardness range hart
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | <0,005 µg/l below limit of quantification | 0.1 µg/l | < 5 % * | Single value |
| Nitrate | 1,0 mg/l | 50 mg/l | 2 % | Single value |
| Lead | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Sulphate | 48 mg/l | 250 mg/l | 19 % | Single value |
| Sodium | 6,40 mg/l | 200 mg/l | 3 % | 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 (71 — most recent value per parameter)
Chemical parameters (40)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | <0,9 µg/l below limit of quantification | 3 µg/l | < 30 % * | Single value |
| Antimony | <0,0005 mg/l below limit of quantification | 5 µg/l | < 10 % * | Single value |
| Arsenic | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Atrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bentazone | <0,03 µg/l below limit of quantification | — | — | Single value |
| Benzene | <0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Single value |
| Benzo(a)pyrene | <0,003 µg/l below limit of quantification | 10 ng/l | < 30 % * | Single value |
| Bisphenol A | <0,05 µg/l below limit of quantification | 2.5 µg/l | < 2 % * | Single value |
| Boron | 0,022 mg/l | 1 mg/l | 2 % | Single value |
| Bromacil | <0,03 µg/l below limit of quantification | — | — | Single value |
| Bromate | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Cadmium | <0,0005 mg/l below limit of quantification | 3 µg/l | < 17 % * | Single value |
| Chlorotoluron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Chromium | <0,002 mg/l below limit of quantification | 25 µg/l | < 8 % * | Single value |
| Copper | <0,002 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 |
| Desethylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Desisopropylatrazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Diuron | <0,03 µg/l below limit of quantification | — | — | Single value |
| Fluoride | <0,15 mg/l below limit of quantification | 1.5 mg/l | < 10 % * | Single value |
| Hexazinone | <0,03 µg/l below limit of quantification | — | — | Single value |
| Isoproturon | <0,03 µg/l below limit of quantification | — | — | Single value |
| Lead | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Lindane | <0,03 µg/l below limit of quantification | — | — | Single value |
| Mecoprop | <0,03 µg/l below limit of quantification | — | — | Single value |
| Mercury | <0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Nickel | <0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Single value |
| Nitrate | 1,0 mg/l | 50 mg/l | 2 % | Single value |
| Nitrite | <0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Single value |
| Pesticides — Total | <0,015 µg/l below limit of quantification | 0.5 µg/l | < 3 % * | Single value |
| Polycyclic aromatic hydrocarbons | <0,03 µg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value |
| Propazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Selenium | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Simazine | <0,03 µg/l below limit of quantification | — | — | Single value |
| Tetrachloroethene | <0,1 µg/l below limit of quantification | — | — | Single value |
| Tri-allate | <0,03 µg/l below limit of quantification | — | — | Single value |
| Trichloroethene | <0,1 µg/l below limit of quantification | — | — | Single value |
| Trihalomethanes — Total | <15 µg/l below limit of quantification | 50 µg/l | < 30 % * | Single value |
| Uranium | <0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Single value |
| Vinyl chloride | <0,15 µg/l below limit of quantification | 0.5 µg/l | < 30 % * | 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 (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of 4 PFAS | <0,001 µg/l below limit of quantification | — | — | Single value |
| Sum of PFAS | <0,005 µg/l below limit of quantification | 0.1 µg/l | < 5 % * | 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 (16)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,02 mg/l below limit of quantification | 0.2 mg/l | < 10 % * | Single value |
| Ammonium | <0,01 mg/l below limit of quantification | 0.5 mg/l | < 2 % * | Single value |
| Calcite dissolution capacity | -18,6 mg/l | 5 mg/l CaCO3 | — | Single value |
| Chloride | 9,3 mg/l | 250 mg/l | 4 % | Single value |
| Colour | 0,15 1/m | 0.5 m⁻¹ | — | Single value |
| Conductivity (25 °C) | 613 µS/cm | 2,790 µS/cm | — | Single value |
| Iron | 0,015 mg/l | 0.2 mg/l | 8 % | Single value |
| Manganese | <0,002 mg/l below limit of quantification | 50 µg/l | < 4 % * | Single value |
| Odour | ohne Abweichung | für den Verbraucher annehmbar | — | Single value |
| pH | 7,37 | 6,5–9,5 | — | Single value |
| Sodium | 6,40 mg/l | 200 mg/l | 3 % | Single value |
| Sulphate | 48 mg/l | 250 mg/l | 19 % | Single value |
| Taste | ohne Abweichung | für den Verbraucher annehmbar | — | Single value |
| Temperature | 12,40 °C | — | — | Single value |
| Total organic carbon (TOC) | 2,31 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.
Further parameters (13)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 5,52 mmol/l | — | — | Single value |
| Base capacity to pH 8.2 | 0,54 mmol/l | — | — | Single value |
| Calcite precipitation capacity | abscheidend | — | — | Single value |
| Calcium | 101 mg/l | — | — | Single value |
| Hardness range (WRMG) | hart | — | — | Single value |
| Hydrogen carbonate | 337 mg/l | — | — | Single value |
| Magnesium | 17 mg/l | — | — | Single value |
| Oxygen | 8,8 mg/l | — | — | Single value |
| Phosphate | <0,5 mg/l below limit of quantification | — | — | Single value |
| Potassium | 1,35 mg/l | — | — | Single value |
| Strontium | 0,552 mg/l | — | — | Single value |
| Total hardness | 17,9 °dH | — | — | Single value |
| Vanadium | <0,002 mg/l below limit of quantification | — | — | 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.mvv.de/fileadmin/user_upload_pk_gewk/pdf/Wasser/wasserqualitaet-schwetzingerhardt.pdf · 21.05.2026 · Untersuchungszeitraum 13.04.2026 bis 21.05.2026, Probenahmedatum 13.04.2026, Kalenderjahr 2026 · retrieved on 11/07/2026
Postcodes in this zone: 69115 , 69117 , 69118 , 69120 , 69121 , 69124 , 69126
Frequently asked questions about drinking water in Heidelberg
- How much nitrate is in the drinking water in Heidelberg?
- Stadtwerke Heidelberg Energie GmbH / Stadtwerke Heidelberg Netze publishes a nitrate value of 14 mg/l for the supply zone Heidelberg Hartwasserzone südlich des Neckars (versorgt durch Wasserwerke Rauschen, Schwetzinger Hardt und Neckargruppe). The statutory parametric value is 50 mg/l; the measured value represents 28 % of the parametric value. Basis: 28.01.2026, retrieved on 11/07/2026.
- Are PFAS detectable in the drinking water in Heidelberg?
- Stadtwerke Heidelberg Energie GmbH / Stadtwerke Heidelberg Netze publishes for the supply zone Heidelberg Hartwasserzone südlich des Neckars (versorgt durch Wasserwerke Rauschen, Schwetzinger Hardt und Neckargruppe) a sum value PFAS-20 of 0,018 µg/l. The statutory parametric value is 0.1 µg/l; the measured value represents 18 % of the parametric value. For the sum of the 20 individual substances, this parametric value has applied since 12/01/2026. Basis: 28.01.2026, retrieved on 11/07/2026.
- Who supplies the drinking water in Heidelberg?
- Stadtwerke Heidelberg Energie GmbH / Stadtwerke Heidelberg Netze. The values shown here come from the supply zone Heidelberg Hartwasserzone südlich des Neckars (versorgt durch Wasserwerke Rauschen, Schwetzinger Hardt und Neckargruppe) 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.