Drinking water in Langenfeld
There are 2 places with this name — listed below by area. 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.
Langenfeld (40764)
Hochbehälter Langenfeld
Verbandswasserwerk Langenfeld-Monheim GmbH & Co. KGAssigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
13.7 °dH
Hardness range medium
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Lead | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · Hochbehälter Langenfeld |
| Escherichia coli (E. coli) | 0 (KBE/100 ml) | 0/100 ml | — | Single value · Hochbehälter Langenfeld |
| Sulphate | 58,7 mg/l | 250 mg/l | 23 % | Single value · Hochbehälter Langenfeld |
| Sodium | 24,6 mg/l | 200 mg/l | 12 % | Single value · Hochbehälter Langenfeld |
* 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 (43 — 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 | — | Single value · Hochbehälter Langenfeld |
| Intestinal enterococci | 0 (KBE/100 ml) | 0/100 ml | — | Single value · Hochbehälter Langenfeld |
Chemical parameters (13)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Antimony | <0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value · Hochbehälter Langenfeld |
| Arsenic | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · Hochbehälter Langenfeld |
| Benzo(a)pyrene | <0,000002 mg/l below limit of quantification | 10 ng/l | < 20 % * | Single value · Hochbehälter Langenfeld |
| Bisphenol A | <0,000005 mg/l below limit of quantification | 2.5 µg/l | < 0.2 % * | Single value · Hochbehälter Langenfeld |
| Cadmium | <0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Single value · Hochbehälter Langenfeld |
| Copper | <0,002 mg/l below limit of quantification | 2 mg/l | < 0.1 % * | Single value · Hochbehälter Langenfeld |
| Epichlorohydrin | <0,00003 mg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value · Hochbehälter Langenfeld |
| Lead | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · Hochbehälter Langenfeld |
| Nickel | <0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Single value · Hochbehälter Langenfeld |
| Nitrite | <0,02 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value · Hochbehälter Langenfeld |
| Polycyclic aromatic hydrocarbons | 0 mg/l | 0.1 µg/l | 0 % | Single value · Hochbehälter Langenfeld |
| Trihalomethanes — Total | - mg/l not determined | 50 µg/l | — | Single value · Hochbehälter Langenfeld |
| Vinyl chloride | <0,00005 mg/l below limit of quantification | 0.5 µg/l | < 10 % * | Single value · Hochbehälter Langenfeld |
* 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 (19)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,01 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Single value · Hochbehälter Langenfeld |
| Ammonium | <0,02 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value · Hochbehälter Langenfeld |
| Calcite dissolution capacity | -6,3 mg/l | 5 mg/l CaCO3 | — | Single value · Hochbehälter Langenfeld |
| Chloride | 36,1 mg/l | 250 mg/l | 14 % | Single value · Hochbehälter Langenfeld |
| Coliform bacteria | 0 (KBE/100 ml) | 0/100 ml | — | Single value · Hochbehälter Langenfeld |
| Colony count 22 °C | 0 KBE/ml | ohne anormale Veränderung | — | Single value · Hochbehälter Langenfeld |
| Colony count 36 °C | 0 KBE/ml | ohne anormale Veränderung | — | Single value · Hochbehälter Langenfeld |
| Colour | <0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Single value · Hochbehälter Langenfeld |
| Conductivity (25 °C) | 571 µS/cm | 2,790 µS/cm | — | Single value · Hochbehälter Langenfeld |
| Iron | <0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value · Hochbehälter Langenfeld |
| Manganese | <0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value · Hochbehälter Langenfeld |
| Odour | ohne, geruchlos - | für den Verbraucher annehmbar | — | Single value · Hochbehälter Langenfeld |
| pH | 7,86 - | 6,5–9,5 | — | Single value · Hochbehälter Langenfeld |
| Sodium | 24,6 mg/l | 200 mg/l | 12 % | Single value · Hochbehälter Langenfeld |
| Sulphate | 58,7 mg/l | 250 mg/l | 23 % | Single value · Hochbehälter Langenfeld |
| Taste | ohne, unauffällig - | für den Verbraucher annehmbar | — | Single value · Hochbehälter Langenfeld |
| Temperature | 10,9 °C | — | — | Single value · Hochbehälter Langenfeld |
| Total organic carbon (TOC) | 0,58 mg/l | ohne anormale Veränderung | — | Single value · Hochbehälter Langenfeld |
| Turbidity | <0,1 NTU below limit of quantification | 1 NTU | — | Single value · Hochbehälter Langenfeld |
* 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 (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | - mg/l not determined | — | — | Single value · Hochbehälter Langenfeld |
Further parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,29 mmol/l | — | — | Single value · Hochbehälter Langenfeld |
| Base capacity to pH 8.2 | 0,11 mmol/l | — | — | Single value · Hochbehälter Langenfeld |
| Calcium | 68,6 mg/l | — | — | Single value · Hochbehälter Langenfeld |
| Carbonate hardness | 9,22 °dH | — | — | Single value · Hochbehälter Langenfeld |
| Magnesium | 17,7 mg/l | — | — | Single value · Hochbehälter Langenfeld |
| Phosphate | 2,45 mg/l | — | — | Single value · Hochbehälter Langenfeld |
| Potassium | 3,04 mg/l | — | — | Single value · Hochbehälter Langenfeld |
| Total hardness | 13,7 °dH | — | — | Single value · Hochbehälter Langenfeld |
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.stw-langenfeld.de/wasser/ · März 2025 · retrieved on 11/07/2026
Postcodes in this zone: 40764
Show 1 more supply zone
Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.
Water hardness
14.5 °dH
Hardness range hard
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,000041 mg/l | — | — | Single value · TWA Monheim |
| Nitrate | 20,9 mg/l | 50 mg/l | 42 % | Single value · TWA Monheim |
| Lead | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · TWA Monheim |
| Escherichia coli (E. coli) | 0 (KBE/100 ml) | 0/100 ml | — | Single value · TWA Monheim |
| Sulphate | 65,3 mg/l | 250 mg/l | 26 % | Single value · TWA Monheim |
| Sodium | 23,8 mg/l | 200 mg/l | 12 % | Single value · TWA Monheim |
* 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 (61 — 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 | — | Single value · TWA Monheim |
| Intestinal enterococci | 0 (KBE/100 ml) | 0/100 ml | — | Single value · TWA Monheim |
Chemical parameters (27)
| 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 % * | Single value · TWA Monheim |
| Antimony | <0,001 mg/l below limit of quantification | 5 µg/l | < 20 % * | Single value · TWA Monheim |
| Arsenic | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · TWA Monheim |
| Benzene | <0,00005 mg/l below limit of quantification | 1 µg/l | < 5 % * | Single value · TWA Monheim |
| Benzo(a)pyrene | <0,000002 mg/l below limit of quantification | 10 ng/l | < 20 % * | Single value · TWA Monheim |
| Bisphenol A | <0,000005 mg/l below limit of quantification | 2.5 µg/l | < 0.2 % * | Single value · TWA Monheim |
| Boron | 0,067 mg/l | 1 mg/l | 7 % | Single value · TWA Monheim |
| Bromate | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · TWA Monheim |
| Cadmium | <0,0002 mg/l below limit of quantification | 3 µg/l | < 7 % * | Single value · TWA Monheim |
| Chromium | <0,0005 mg/l below limit of quantification | 25 µg/l | < 2 % * | Single value · TWA Monheim |
| Copper | 0,004 mg/l | 2 mg/l | 0.2 % | Single value · TWA Monheim |
| Cyanide | <0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value · TWA Monheim |
| Epichlorohydrin | <0,00003 mg/l below limit of quantification | 0.1 µg/l | < 30 % * | Single value · TWA Monheim |
| Fluoride | 0,1 mg/l | 1.5 mg/l | 7 % | Single value · TWA Monheim |
| Lead | <0,002 mg/l below limit of quantification | 10 µg/l | < 20 % * | Single value · TWA Monheim |
| Mercury | <0,0001 mg/l below limit of quantification | 1 µg/l | < 10 % * | Single value · TWA Monheim |
| Nickel | <0,002 mg/l below limit of quantification | 20 µg/l | < 10 % * | Single value · TWA Monheim |
| Nitrate | 20,9 mg/l | 50 mg/l | 42 % | Single value · TWA Monheim |
| Nitrite | <0,02 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value · TWA Monheim |
| Pesticides | n.n. mg/l not detectable | 0.1 µg/l | — | Single value · TWA Monheim |
| Pesticides — Total | - mg/l not determined | 0.5 µg/l | — | Single value · TWA Monheim |
| Polycyclic aromatic hydrocarbons | 0 mg/l | 0.1 µg/l | 0 % | Single value · TWA Monheim |
| Selenium | <0,001 mg/l below limit of quantification | 10 µg/l | < 10 % * | Single value · TWA Monheim |
| Tetrachloroethene and Trichloroethene (sum) | 0,00064 mg/l | 10 µg/l | 6 % | Single value · TWA Monheim |
| Trihalomethanes — Total | 0 mg/l | 50 µg/l | 0 % | Single value · TWA Monheim |
| Uranium | <0,0001 mg/l below limit of quantification | 10 µg/l | < 1 % * | Single value · TWA Monheim |
| Vinyl chloride | <0,00005 mg/l below limit of quantification | 0.5 µg/l | < 10 % * | Single value · TWA Monheim |
* 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 | 0,000010 mg/l | — | — | Single value · TWA Monheim |
| Sum of PFAS | 0,000041 mg/l | — | — | Single value · TWA Monheim |
Indicator parameters (19)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | <0,01 mg/l below limit of quantification | 0.2 mg/l | < 5 % * | Single value · TWA Monheim |
| Ammonium | <0,02 mg/l below limit of quantification | 0.5 mg/l | < 4 % * | Single value · TWA Monheim |
| Calcite dissolution capacity | -1,6 mg/l | 5 mg/l CaCO3 | — | Single value · TWA Monheim |
| Chloride | 43,5 mg/l | 250 mg/l | 17 % | Single value · TWA Monheim |
| Coliform bacteria | 0 (KBE/100 ml) | 0/100 ml | — | Single value · TWA Monheim |
| Colony count 22 °C | 0 KBE/ml | ohne anormale Veränderung | — | Single value · TWA Monheim |
| Colony count 36 °C | 0 KBE/ml | ohne anormale Veränderung | — | Single value · TWA Monheim |
| Colour | <0,1 m-1 below limit of quantification | 0.5 m⁻¹ | — | Single value · TWA Monheim |
| Conductivity (25 °C) | 613 µS/cm | 2,790 µS/cm | — | Single value · TWA Monheim |
| Iron | <0,005 mg/l below limit of quantification | 0.2 mg/l | < 3 % * | Single value · TWA Monheim |
| Manganese | <0,005 mg/l below limit of quantification | 50 µg/l | < 10 % * | Single value · TWA Monheim |
| Odour | ohne, geruchlos - | für den Verbraucher annehmbar | — | Single value · TWA Monheim |
| pH | 7,77 - | 6,5–9,5 | — | Single value · TWA Monheim |
| Sodium | 23,8 mg/l | 200 mg/l | 12 % | Single value · TWA Monheim |
| Sulphate | 65,3 mg/l | 250 mg/l | 26 % | Single value · TWA Monheim |
| Taste | ohne, unauffällig - | für den Verbraucher annehmbar | — | Single value · TWA Monheim |
| Temperature | 12,3 °C | — | — | Single value · TWA Monheim |
| Total organic carbon (TOC) | 0,26 mg/l | ohne anormale Veränderung | — | Single value · TWA Monheim |
| Turbidity | <0,1 NTU below limit of quantification | 1 NTU | — | Single value · TWA Monheim |
* 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.
Radiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Gross alpha activity | <0,025 BQ7l below limit of quantification | — | — | Single value · TWA Monheim |
| Radon-222 | <10 Bq/l below limit of quantification | 100 Bq/l | — | Single value · TWA Monheim |
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | - mg/l not determined | — | — | Single value · TWA Monheim |
Further parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Acid capacity to pH 4.3 | 3,37 mmol/l | — | — | Single value · TWA Monheim |
| Base capacity to pH 8.2 | 0,14 mmol/l | — | — | Single value · TWA Monheim |
| Calcium | 61,1 mg/l | — | — | Single value · TWA Monheim |
| Carbonate hardness | 9,44 °dH | — | — | Single value · TWA Monheim |
| Magnesium | 25,6 mg/l | — | — | Single value · TWA Monheim |
| Phosphate | 2,33 mg/l | — | — | Single value · TWA Monheim |
| Potassium | 3,70 mg/l | — | — | Single value · TWA Monheim |
| Total hardness | 14,5 °dH | — | — | Single value · TWA Monheim |
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.stw-langenfeld.de/wasser/ · März 2025 · retrieved on 11/07/2026
Postcodes in this zone: 40764
Frequently asked questions about drinking water in Langenfeld
- How hard is the water in Langenfeld?
- Verbandswasserwerk Langenfeld-Monheim GmbH & Co. KG publishes a total hardness of 13.7 °dH for the supply zone Hochbehälter Langenfeld (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: Publication by the water supplier, retrieved on 11/07/2026.
- Who supplies the drinking water in Langenfeld?
- Verbandswasserwerk Langenfeld-Monheim GmbH & Co. KG. The values shown here come from the supply zone Hochbehälter Langenfeld 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.
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For postcode 91474 there is no verified assignment yet.