Drinking water in Flensburg
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
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.
Wasserwerk Ostseebad
Stadtwerke Flensburg GmbHAssigned 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 µg/l | — | — | Single value |
| Nitrate | 0,16 mg/l | 50 mg/l | 0.3 % | Single value |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Sulphate | 22 mg/l | 250 mg/l | 9 % | Single value |
| Sodium | 17 mg/l | 200 mg/l | 9 % | 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 (87 — most recent value per parameter)
Chemical parameters (52)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,2 µg/l below limit of quantification | 3 µg/l | < 7 % * | Single value |
| 1,2-Dichloropropane | < 0,1 µg/l below limit of quantification | — | — | Single value |
| 2,6-Dichlorobenzamide (BAM) | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Antimony | < 0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value |
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Atrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Bentazone | < 0,025 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 |
| Benzo(b)fluoranthene | < 0,02 µg/l below limit of quantification | — | — | Single value |
| Benzo(ghi)perylene | < 0,02 µg/l below limit of quantification | — | — | Single value |
| Benzo(k)fluoranthene | < 0,02 µg/l below limit of quantification | — | — | Single value |
| Bisphenol A | < 0,05 µg/l below limit of quantification | 2.5 µg/l | < 2 % * | Single value |
| Boron | 0,048 mg/l | 1 mg/l | 5 % | Single value |
| Bromacil | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Bromate | < 0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Single value |
| Bromodichloromethane | < 0,0003 mg/l below limit of quantification | — | — | Single value |
| Cadmium | < 0,0003 mg/l below limit of quantification | 3 µg/l | < 10 % * | Single value |
| Chloridazon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Chlorotoluron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Copper | < 0,005 mg/l below limit of quantification | 2 mg/l | < 0.3 % * | Single value |
| Cyanide | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value |
| Desethylatrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Desisopropylatrazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Dibromochloromethane | < 0,0001 mg/l below limit of quantification | — | — | Single value |
| Dimethenamid | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Diuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Flufenacet | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Fluoride | 0,17 mg/l | 1.5 mg/l | 11 % | Single value |
| Glyphosate | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Imidacloprid | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Indeno(1,2,3-cd)pyrene | < 0,02 µg/l below limit of quantification | — | — | Single value |
| Isoproturon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value |
| Mecoprop-P | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Mercury | < 0,1 µg/l below limit of quantification | 1 µg/l | < 10 % * | Single value |
| Metalaxyl | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metolachlor | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Nickel | < 0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Single value |
| Nicosulfuron | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Nitrate | 0,16 mg/l | 50 mg/l | 0.3 % | Single value |
| Nitrite | < 0,03 mg/l below limit of quantification | 0.5 mg/l | < 6 % * | Single value |
| Oxadixyl | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Selenium | < 0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value |
| Simazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Tebuconazole | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Terbuthylazine | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Tetrachloroethene | < 0,1 µg/l below limit of quantification | — | — | Single value |
| Tribromomethane (bromoform) | < 0,0001 mg/l below limit of quantification | — | — | Single value |
| Trichloroethene | < 0,1 µg/l below limit of quantification | — | — | Single value |
| Trichloromethane (chloroform) | < 0,1 µg/l below limit of quantification | — | — | Single value |
| Uranium | < 0,0005 mg/l below limit of quantification | 10 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.
PFAS (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0 µg/l | — | — | Single value |
| Trifluoroacetic acid (TFA) | < 0,5 µg/l below limit of quantification | 60 µg/l UBA guide value | < 0.8 % * | 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.
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.
Metabolites (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1H-1,2,4-Triazole | < 0,03 µg/l below limit of quantification | — | — | Single value |
| Desphenyl-chloridazon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Dimethachlor acid CGA 50266 | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Dimethachlor sulfonic acid CGA 354742 | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Dimethenamid sulfonic acid M27 | < 0,1 µg/l below limit of quantification | — | — | Single value |
| Metazachlor metabolite BH 479-11 | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metazachlor metabolite BH 479-9 | < 0,025 µg/l below limit of quantification | — | — | Single value |
| Metazachlor sulfonic acid BH 479-8 | 0,21 µg/l | — | — | Single value |
| Methyl-desphenyl-chloridazon | < 0,025 µg/l below limit of quantification | — | — | Single value |
| S-metolachlor acid CGA 51202/351916 | < 0,025 µg/l below limit of quantification | — | — | Single value |
| S-metolachlor sulfonic acid CGA 380168/354743 | 0,14 µg/l | — | — | Single 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 | < 0,03 mg/l below limit of quantification | 0.5 mg/l | < 6 % * | Single value |
| Calcite dissolution capacity | -1,31 mg/l | 5 mg/l CaCO3 | — | Single value |
| Chloride | 24 mg/l | 250 mg/l | 10 % | Single value |
| Colour | < 0,1 m^-1 below limit of quantification | 0.5 m⁻¹ | — | Single value |
| Conductivity (25 °C) | 386 µS/cm | 2,790 µS/cm | — | Single value |
| Iron | < 0,01 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Single value |
| Manganese | < 0,003 mg/l below limit of quantification | 50 µg/l | < 6 % * | Single value |
| Odour | ohne | für den Verbraucher annehmbar | — | Single value |
| pH | 7,7 | 6,5–9,5 | — | Single value |
| Sodium | 17 mg/l | 200 mg/l | 9 % | Single value |
| Sulphate | 22 mg/l | 250 mg/l | 9 % | Single value |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value |
| Temperature | 10,2 °C | — | — | Single value |
| Total organic carbon (TOC) | 1,1 mg/l | ohne anormale Veränderung | — | Single value |
| Turbidity | 0,11 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 (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,6 mmol/l | — | — | Single value |
| Calcium | 55 mg/l | — | — | Single value |
| Carbonate hardness | 7,3 °dH | — | — | Single value |
| Magnesium | 4,0 mg/l | — | — | Single value |
| Potassium | 2,0 mg/l | — | — | Single value |
| Total hardness | 8,5 °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.
Postcodes in this zone: 24937 , 24939 , 24941 , 24943 , 24944
Show 1 more supply zone
Wasserwerk Süd
Stadtwerke Flensburg GmbHAssigned 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 µg/l | 0.1 µg/l | 0 % | Single value · Wasserwerk Süd |
| Nitrate | < 0,5 mg/l below limit of quantification | 50 mg/l | < 1 % * | Single value · Wasserwerk Süd |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Sulphate | 10 mg/l | 250 mg/l | 4 % | Single value · Wasserwerk Süd |
| Sodium | 12 mg/l | 200 mg/l | 6 % | Single value · Wasserwerk Süd |
* 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 (53 — most recent value per parameter)
Chemical parameters (29)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,2 µg/l below limit of quantification | 3 µg/l | < 7 % * | Single value · Wasserwerk Süd |
| Antimony | < 0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value · Wasserwerk Süd |
| Arsenic | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Benzene | < 0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Single value · Wasserwerk Süd |
| Benzo(a)pyrene | < 0,003 µg/l below limit of quantification | 10 ng/l | < 30 % * | Single value · Wasserwerk Süd |
| Benzo(b)fluoranthene | < 0,02 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Benzo(ghi)perylene | < 0,02 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Benzo(k)fluoranthene | < 0,02 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Bisphenol A | 0,24 µg/l | 2.5 µg/l | 10 % | Single value · Wasserwerk Süd |
| Boron | 0,067 mg/l | 1 mg/l | 7 % | Single value · Wasserwerk Süd |
| Bromate | < 0,003 mg/l below limit of quantification | 10 µg/l | < 30 % * | Single value · Wasserwerk Süd |
| Bromodichloromethane | < 0,0003 mg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Cadmium | < 0,0003 mg/l below limit of quantification | 3 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Copper | < 0,005 mg/l below limit of quantification | 2 mg/l | < 0.3 % * | Single value · Wasserwerk Süd |
| Cyanide | < 0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Dibromochloromethane | < 0,0001 mg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Fluoride | 0,14 mg/l | 1.5 mg/l | 9 % | Single value · Wasserwerk Süd |
| Indeno(1,2,3-cd)pyrene | < 0,02 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Lead | < 0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Mercury | < 0,1 µg/l below limit of quantification | 1 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Nickel | < 0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Single value · Wasserwerk Süd |
| Nitrate | < 0,5 mg/l below limit of quantification | 50 mg/l | < 1 % * | Single value · Wasserwerk Süd |
| Nitrite | < 0,03 mg/l below limit of quantification | 0.5 mg/l | < 6 % * | Single value · Wasserwerk Süd |
| Selenium | < 0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · Wasserwerk Süd |
| Tetrachloroethene | < 0,1 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Tribromomethane (bromoform) | < 0,0001 mg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Trichloroethene | < 0,1 µg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Trichloromethane (chloroform) | < 0,0001 mg/l below limit of quantification | — | — | Single value · Wasserwerk Süd |
| Uranium | < 0,0005 mg/l below limit of quantification | 10 µg/l | < 5 % * | Single value · Wasserwerk Süd |
* 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 µg/l | — | — | Single value · Wasserwerk Süd |
| Sum of PFAS | 0 µg/l | 0.1 µg/l | 0 % | Single value · Wasserwerk Süd |
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 · Wasserwerk Süd |
| Ammonium | 0,13 mg/l | 0.5 mg/l | 26 % | Single value · Wasserwerk Süd |
| Calcite dissolution capacity | -5,48 mg/l | 5 mg/l CaCO3 | — | Single value · Wasserwerk Süd |
| Chloride | 17 mg/l | 250 mg/l | 7 % | Single value · Wasserwerk Süd |
| Colour | 0,1 m^-1 | 0.5 m⁻¹ | — | Single value · Wasserwerk Süd |
| Conductivity (25 °C) | 312 µS/cm | 2,790 µS/cm | — | Single value · Wasserwerk Süd |
| Iron | 0,02 mg/l | 0.2 mg/l | 10 % | Single value · Wasserwerk Süd |
| Manganese | < 0,003 mg/l below limit of quantification | 50 µg/l | < 6 % * | Single value · Wasserwerk Süd |
| Odour | ohne | für den Verbraucher annehmbar | — | Single value · Wasserwerk Süd |
| pH | 8,1 | 6,5–9,5 | — | Single value · Wasserwerk Süd |
| Sodium | 12 mg/l | 200 mg/l | 6 % | Single value · Wasserwerk Süd |
| Sulphate | 10 mg/l | 250 mg/l | 4 % | Single value · Wasserwerk Süd |
| Taste | ohne | für den Verbraucher annehmbar | — | Single value · Wasserwerk Süd |
| Temperature | 10,5 °C | — | — | Single value · Wasserwerk Süd |
| Total organic carbon (TOC) | 1,2 mg/l | ohne anormale Veränderung | — | Single value · Wasserwerk Süd |
| Turbidity | 0,10 NTU | 1 NTU | — | Single value · Wasserwerk Süd |
* 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 (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 2,5 mmol/l | — | — | Single value · Wasserwerk Süd |
| Calcium | 41 mg/l | — | — | Single value · Wasserwerk Süd |
| Carbonate hardness | 7,0 °dH | — | — | Single value · Wasserwerk Süd |
| Magnesium | 6,2 mg/l | — | — | Single value · Wasserwerk Süd |
| Potassium | 3,6 mg/l | — | — | Single value · Wasserwerk Süd |
| Total hardness | 7,2 °dH | — | — | Single value · Wasserwerk Süd |
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: 24937 , 24939 , 24941 , 24943 , 24944
Frequently asked questions about drinking water in Flensburg
- How hard is the water in Flensburg?
- Stadtwerke Flensburg GmbH publishes a total hardness of 8.5 °dH for the supply zone Wasserwerk Ostseebad (hardness range medium). 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: 19.11.2025, retrieved on 11/07/2026.
- How much nitrate is in the drinking water in Flensburg?
- Stadtwerke Flensburg GmbH publishes a nitrate value of 0,16 mg/l for the supply zone Wasserwerk Ostseebad. The statutory parametric value is 50 mg/l; the measured value represents 0.3 % of the parametric value. Basis: 19.11.2025, retrieved on 11/07/2026.
- Who supplies the drinking water in Flensburg?
- Stadtwerke Flensburg GmbH. The values shown here come from the supply zone Wasserwerk Ostseebad 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.