How hard is the water in Heiden?

Wasserversorgung Heiden publishes a total hardness of 23 °fH for the supply zone Heiden — that corresponds to 12.9 °dH. 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: 2025, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Heiden?

Wasserversorgung Heiden publishes a nitrate value of 4.7 mg/l for the supply zone Heiden. The statutory parametric value is 40 mg/l; the measured value represents 12 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.

Who supplies the drinking water in Heiden?

Wasserversorgung Heiden. The values shown here come from the supply zone Heiden 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.

Drinking water in Heiden

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.

Heiden (46359)

Borken

Stadtwerke Borken

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values Borken
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	2,29 mg/l	50 mg/l	5 %	Mean · Borken
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean · Borken
Sulphate	46,9 mg/l	250 mg/l	19 %	Mean · Borken
Sodium	12,0 mg/l	200 mg/l	6 %	Mean · Borken

* 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 (19 — most recent value per parameter)

Chemical parameters (5)

Chemical parameters – Borken
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,09 mg/l	1.5 mg/l	6 %	Mean · Borken
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean · Borken
Nitrate	2,29 mg/l	50 mg/l	5 %	Mean · Borken
Nitrite	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean · Borken
Uranium	0,00075 mg/l	10 µg/l	8 %	Mean · Borken

Indicator parameters (9)

Indicator parameters – Borken
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean · Borken
Ammonium	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean · Borken
Chloride	28,0 mg/l	250 mg/l	11 %	Mean · Borken
Conductivity (25 °C)	553 µS/cm	2,790 µS/cm	—	Mean · Borken
pH	7,6 -	6,5–9,5	—	Mean · Borken
Sodium	12,0 mg/l	200 mg/l	6 %	Mean · Borken
Sulphate	46,9 mg/l	250 mg/l	19 %	Mean · Borken
Temperature	11,3 °C	—	—	Mean · Borken
Total organic carbon (TOC)	0,79 mg/l	ohne anormale Veränderung	—	Mean · Borken

Further parameters (5)

Further parameters – Borken
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	3,76 mmol/l	—	—	Mean · Borken
Base capacity to pH 8.2	0,19 mmop/l	—	—	Mean · Borken
Calcium	95,4 mg/l	—	—	Mean · Borken
Magnesium	4,1 mg/l	—	—	Mean · Borken
Total hardness	2,55 (14,3) mmol/l (°dH)	—	—	Mean · Borken

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.stadtwerke-borken.de/netze/wasserqualitaet · Jahr 2025 · retrieved on 11/07/2026

Postcodes in this zone: 46359

Show 1 more supply zone

Borken, Heiden und Raesfeld (ohne Erle)

Stadtwerke Borken

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Key values Borken, Heiden und Raesfeld (ohne Erle)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	2,29 mg/l	50 mg/l	5 %	Mean
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean
Sulphate	46,9 mg/l	250 mg/l	19 %	Mean
Sodium	12,0 mg/l	200 mg/l	6 %	Mean

Show all recorded parameters (19 — most recent value per parameter)

Chemical parameters (5)

Chemical parameters – Borken, Heiden und Raesfeld (ohne Erle)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,09 mg/l	1.5 mg/l	6 %	Mean
Lead	<0,002 mg/l below limit of quantification	10 µg/l	< 20 % *	Mean
Nitrate	2,29 mg/l	50 mg/l	5 %	Mean
Nitrite	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean
Uranium	0,00075 mg/l	10 µg/l	8 %	Mean

Indicator parameters (9)

Indicator parameters – Borken, Heiden und Raesfeld (ohne Erle)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	<0,010 mg/l below limit of quantification	0.2 mg/l	< 5 % *	Mean
Ammonium	<0,020 mg/l below limit of quantification	0.5 mg/l	< 4 % *	Mean
Chloride	28,0 mg/l	250 mg/l	11 %	Mean
Conductivity (25 °C)	553 µS/cm	2,790 µS/cm	—	Mean
pH	7,6 -	6,5–9,5	—	Mean
Sodium	12,0 mg/l	200 mg/l	6 %	Mean
Sulphate	46,9 mg/l	250 mg/l	19 %	Mean
Temperature	11,3 °C	—	—	Mean
Total organic carbon (TOC)	0,79 mg/l	ohne anormale Veränderung	—	Mean

Further parameters (5)

Further parameters – Borken, Heiden und Raesfeld (ohne Erle)
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	3,76 mmol/l	—	—	Mean
Base capacity to pH 8.2	0,19 mmop/l	—	—	Mean
Calcium	95,4 mg/l	—	—	Mean
Magnesium	4,1 mg/l	—	—	Mean
Total hardness	2,55 (14,3) mmol/l (°dH)	—	—	Mean

Source: https://www.stadtwerke-borken.de/netze/wasserqualitaet · Mittelwerte für das Jahr 2025 · retrieved on 25/07/2026

Postcodes in this zone: 46359

Heiden (9410)

Heiden

Wasserversorgung Heiden

Assigned via the water supplier — the exact supply zone boundary within the postcode is not yet linked.

Water hardness

12.9 °dH

Hardness range medium

Key values Heiden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.7 mg/l	40 mg/l	12 %	Mean · Heiden
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Heiden
Sulphate	17.53 mg/l	—	—	Mean · Heiden
Sodium	7.7 mg/l	200 mg/l	4 %	Mean · Heiden

Show all recorded parameters (17 — most recent value per parameter)

Microbiology (3)

Microbiology – Heiden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aerobic mesophilic bacteria	9 KBE/ml	300 1/ml	—	Mean · Heiden
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Heiden
Intestinal enterococci	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Heiden

Chemical parameters (1)

Chemical parameters – Heiden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.7 mg/l	40 mg/l	12 %	Mean · Heiden

Indicator parameters (9)

Indicator parameters – Heiden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	10.6 mg/l	—	—	Mean · Heiden
Conductivity (25 °C)	426 µS/cm	—	—	Mean · Heiden
Iron	0.006 mg/l	0.2 mg/l	3 %	Mean · Heiden
Manganese	0 mg/l	50 µg/l	0 %	Mean · Heiden
pH	7.59	—	—	Mean · Heiden
Sodium	7.7 mg/l	200 mg/l	4 %	Mean · Heiden
Sulphate	17.53 mg/l	—	—	Mean · Heiden
Temperature	12.5 °C	—	—	Mean · Heiden
Turbidity	0.08 TE/F	—	—	Mean · Heiden

Further parameters (4)

Further parameters – Heiden
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	67 mg/l	—	—	Mean · Heiden
Dissolved organic carbon (DOC)	0.71 mg/l	—	—	Mean · Heiden
Magnesium	13 mg/l	—	—	Mean · Heiden
Total hardness	23 °fH	—	—	Mean · Heiden

Source: https://trinkwasser.ch/de/versorger/1595/wasserversorgung-heiden/3509/heiden · 2025 · 2025 · retrieved on 07/08/2026

Postcodes in this zone: 9410

Frequently asked questions about drinking water in Heiden

How hard is the water in Heiden?: Wasserversorgung Heiden publishes a total hardness of 23 °fH for the supply zone Heiden — that corresponds to 12.9 °dH. 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: 2025, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Heiden?: Wasserversorgung Heiden publishes a nitrate value of 4.7 mg/l for the supply zone Heiden. The statutory parametric value is 40 mg/l; the measured value represents 12 % of the parametric value. Basis: 2025, retrieved on 07/08/2026.
Who supplies the drinking water in Heiden?: Wasserversorgung Heiden. The values shown here come from the supply zone Heiden 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.