How hard is the water in Postcode 58769?

Stadtwerke Iserlohn (SauerlandWasser) publishes a total hardness of 2,65 mmol/l for the supply zone Iserlohn — that corresponds to 14.9 °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: Mai 2026, retrieved on 25/07/2026.

How much nitrate is in the drinking water in Postcode 58769?

Stadtwerke Iserlohn (SauerlandWasser) publishes a nitrate value of 15,0 mg/l for the supply zone Iserlohn. The statutory parametric value is 50 mg/l; the measured value represents 30 % of the parametric value. Basis: Mai 2026, retrieved on 25/07/2026.

Who supplies the drinking water in Postcode 58769?

Stadtwerke Iserlohn (SauerlandWasser). The values shown here come from the supply zone Iserlohn 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 58769

For this postcode the responsible water supplier 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 5 underneath.

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.

Iserlohn

Stadtwerke Iserlohn (SauerlandWasser)

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

Water hardness

14.9 °dH

Hardness range hard

Key values Iserlohn
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	15,0 mg/l	50 mg/l	30 %	Maximum · Iserlohn
Sulphate	67,4 mg/l	250 mg/l	27 %	Maximum · Iserlohn
Sodium	23,4 mg/l	200 mg/l	12 %	Maximum · Iserlohn

Show all recorded parameters (12 — most recent value per parameter)

Chemical parameters (2)

Chemical parameters – Iserlohn
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,09 mg/l	1.5 mg/l	6 %	Maximum · Iserlohn
Nitrate	15,0 mg/l	50 mg/l	30 %	Maximum · Iserlohn

Indicator parameters (4)

Indicator parameters – Iserlohn
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	35,8 mg/l	250 mg/l	14 %	Maximum · Iserlohn
pH	7,85	6,5–9,5	—	Maximum · Iserlohn
Sodium	23,4 mg/l	200 mg/l	12 %	Maximum · Iserlohn
Sulphate	67,4 mg/l	250 mg/l	27 %	Maximum · Iserlohn

Treatment substances (2)

Treatment substances – Iserlohn
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorine dioxide	not determined	—	—	Single value · Iserlohn
Ozone	not determined	—	—	Single value · Iserlohn

Further parameters (4)

Further parameters – Iserlohn
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	88,8 mg/l	—	—	Maximum · Iserlohn
Magnesium	10,5 mg/l	—	—	Maximum · Iserlohn
Potassium	3,1 mg/l	—	—	Maximum · Iserlohn
Total hardness	2,65 mmol/l	—	—	Maximum · Iserlohn

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-iserlohn.de/wasser/ · Mai 2026 · retrieved on 25/07/2026

Show 5 more supply zones in this postcode

iserlohn gesamt

Stadtwerke Iserlohn (SauerlandWasser)

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

No date is given for these values. The water supplier publishes the analysis without a sampling date and without a report date. When the water was examined is not apparent from the source — we do not add a date and we do not estimate one. What is stated is therefore only when we retrieved the document.

Water hardness

12.2 °dH

Hardness range medium

Key values iserlohn gesamt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value
Sodium	19,3 mg/l	200 mg/l	10 %	Single value

Show all recorded parameters (12 — most recent value per parameter)

Chemical parameters (2)

Chemical parameters – iserlohn gesamt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,06 mg/l	1.5 mg/l	4 %	Single value
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value

Indicator parameters (4)

Indicator parameters – iserlohn gesamt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	34,4 mg/l	250 mg/l	14 %	Single value
pH	7,75	6,5–9,5	—	Single value
Sodium	19,3 mg/l	200 mg/l	10 %	Single value
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value

Treatment substances (2)

Treatment substances – iserlohn gesamt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chlorine dioxide	not determined	—	—	Single value
Ozone	not determined	—	—	Single value

Further parameters (4)

Further parameters – iserlohn gesamt
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	72,5 mg/l	—	—	Single value
Magnesium	8,7 mg/l	—	—	Single value
Potassium	2,3 mg/l	—	—	Single value
Total hardness	2,17 mmol/l	—	—	Single value

Source: https://www.stadtwerke-iserlohn.de/wasser/ · retrieved on 11/07/2026

Nachrodt, Einsal, Opperhusen

Stadtwerke Iserlohn (SauerlandWasser)

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

Water hardness

12.2 °dH

Hardness range medium

Key values Nachrodt, Einsal, Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value · Nachrodt, Einsal, Opperhusen
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value · Nachrodt, Einsal, Opperhusen
Sodium	19,3 mg/l	200 mg/l	10 %	Single value · Nachrodt, Einsal, Opperhusen

Show all recorded parameters (10 — most recent value per parameter)

Chemical parameters (2)

Chemical parameters – Nachrodt, Einsal, Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,06 mg/l	1.5 mg/l	4 %	Single value · Nachrodt, Einsal, Opperhusen
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value · Nachrodt, Einsal, Opperhusen

Indicator parameters (4)

Indicator parameters – Nachrodt, Einsal, Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	34,4 mg/l	250 mg/l	14 %	Single value · Nachrodt, Einsal, Opperhusen
pH	7,75	6,5–9,5	—	Single value · Nachrodt, Einsal, Opperhusen
Sodium	19,3 mg/l	200 mg/l	10 %	Single value · Nachrodt, Einsal, Opperhusen
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value · Nachrodt, Einsal, Opperhusen

Further parameters (4)

Further parameters – Nachrodt, Einsal, Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	72,5 mg/l	—	—	Single value · Nachrodt, Einsal, Opperhusen
Magnesium	8,7 mg/l	—	—	Single value · Nachrodt, Einsal, Opperhusen
Potassium	2,3 mg/l	—	—	Single value · Nachrodt, Einsal, Opperhusen
Total hardness	2,17 mmol/l	—	—	Single value · Nachrodt, Einsal, Opperhusen

Source: https://www.stadtwerke-iserlohn.de/wasser/ · Stand: Mai 2026 · retrieved on 25/07/2026

Nachrodt, Einsal und Opperhusen

Stadtwerke Iserlohn (SauerlandWasser)

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

Water hardness

12.2 °dH

Hardness range medium

Key values Nachrodt, Einsal und Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value · Nachrodt, Einsal und Opperhusen
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value · Nachrodt, Einsal und Opperhusen
Sodium	19,3 mg/l	200 mg/l	10 %	Single value · Nachrodt, Einsal und Opperhusen

Show all recorded parameters (10 — most recent value per parameter)

Chemical parameters (2)

Chemical parameters – Nachrodt, Einsal und Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,06 mg/l	1.5 mg/l	4 %	Single value · Nachrodt, Einsal und Opperhusen
Nitrate	14,0 mg/l	50 mg/l	28 %	Single value · Nachrodt, Einsal und Opperhusen

Indicator parameters (4)

Indicator parameters – Nachrodt, Einsal und Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	34,4 mg/l	250 mg/l	14 %	Single value · Nachrodt, Einsal und Opperhusen
pH	7,75	6,5–9,5	—	Single value · Nachrodt, Einsal und Opperhusen
Sodium	19,3 mg/l	200 mg/l	10 %	Single value · Nachrodt, Einsal und Opperhusen
Sulphate	54,4 mg/l	250 mg/l	22 %	Single value · Nachrodt, Einsal und Opperhusen

Further parameters (4)

Further parameters – Nachrodt, Einsal und Opperhusen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	72,5 mg/l	—	—	Single value · Nachrodt, Einsal und Opperhusen
Magnesium	8,7 mg/l	—	—	Single value · Nachrodt, Einsal und Opperhusen
Potassium	2,3 mg/l	—	—	Single value · Nachrodt, Einsal und Opperhusen
Total hardness	2,17 mmol/l	—	—	Single value · Nachrodt, Einsal und Opperhusen

Source: https://www.stadtwerke-iserlohn.de/wasser/ · Mai 2026 · Stand: Mai 2026 · retrieved on 25/07/2026

Treckinghausen

Stadtwerke Lüdenscheid

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

These values are more than a year old. The most recent analysis the water supplier has published for this zone dates from 31/12/2017. We have no newer values — which is why we show the latest available ones rather than none at all. They say nothing about how the water has changed since then.

Key values Treckinghausen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4,2 mg / l	50 mg/l	—	Mean
Lead	<0,001 mg / l below limit of quantification	10 µg/l	—	Mean
Sulphate	9 mg / l	250 mg/l	—	Mean
Sodium	7,1 mg / l	200 mg/l	—	Mean

Show all recorded parameters (27 — most recent value per parameter)

Microbiology (1)

Microbiology – Treckinghausen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Intestinal enterococci	0 / 100 ml	0/100 ml	—	Maximum · Median 0

Chemical parameters (5)

Chemical parameters – Treckinghausen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0,06 mg/l	1.5 mg/l	4 %	Mean
Lead	<0,001 mg / l below limit of quantification	10 µg/l	—	Mean
Nitrate	4,2 mg / l	50 mg/l	—	Mean
Nitrite	<0,01 mg / l below limit of quantification	0.5 mg/l	—	Mean
Uranium	<0,0001 mg / l below limit of quantification	10 µg/l	—	Mean

Indicator parameters (12)

Indicator parameters – Treckinghausen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	0,01 mg / l	0.2 mg/l	—	Mean
Ammonium	<0,04 mg / l below limit of quantification	0.5 mg/l	—	Mean
Chloride	13 mg / l	250 mg/l	—	Mean
Clostridium perfringens (including spores)	0 / 100 ml	0/100 ml	—	Maximum · Median 0
Iron	<0,01 mg / l below limit of quantification	0.2 mg/l	—	Mean
Manganese	<0,005 mg / l below limit of quantification	50 µg/l	—	Mean
Odour	geruchlos	für den Verbraucher annehmbar	—	Single value
Sodium	7,1 mg / l	200 mg/l	—	Mean
Sulphate	9 mg / l	250 mg/l	—	Mean
Temperature	6,8 °C	—	—	Mean
Total organic carbon (TOC)	0,8 mg/l	ohne anormale Veränderung	—	Mean
Turbidity	0,08 FNU	1 NTU	—	Mean

Further parameters (9)

Further parameters – Treckinghausen
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	0,5 mmol / l	—	—	Mean
Base capacity to pH 8.2	nicht untersucht, da pH-Wert ≥ 8,2 mmol / l not determined	—	—	Single value
Calcium	12,0 mg / l	—	—	Mean
Dissolved organic carbon (DOC)	0,8 mg/l	—	—	Mean
Magnesium	2,3 mg / l	—	—	Mean
Phosphate	<0,01 mg / l below limit of quantification	—	—	Mean
Potassium	0,7 mg / l	—	—	Mean
Silicate / silicic acid	2,5 mg / l	—	—	Mean
Sum of alkaline earth metals	0,4 mmol / l	—	—	Mean

Source: https://www.stadtwerke-meinerzhagen.de/de/Produkte/Wasser/Wasseranalyse/Wasseranalyse/Trinkwasseranalyse-Stadtwerke-Luedenscheid.pdf · Jahresmittelwert 2017 · retrieved on 14/07/2026

Altena

Stadtwerke Altena

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

Key values Altena
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	12 mg/l	50 mg/l	24 %	Single value

Source: https://www.stadtwerke-altena.de/wasser/wasserqualitaet.html · retrieved on 11/07/2026

Frequent questions about postcode 58769

How hard is the water in Postcode 58769?: Stadtwerke Iserlohn (SauerlandWasser) publishes a total hardness of 2,65 mmol/l for the supply zone Iserlohn — that corresponds to 14.9 °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: Mai 2026, retrieved on 25/07/2026.
How much nitrate is in the drinking water in Postcode 58769?: Stadtwerke Iserlohn (SauerlandWasser) publishes a nitrate value of 15,0 mg/l for the supply zone Iserlohn. The statutory parametric value is 50 mg/l; the measured value represents 30 % of the parametric value. Basis: Mai 2026, retrieved on 25/07/2026.
Who supplies the drinking water in Postcode 58769?: Stadtwerke Iserlohn (SauerlandWasser). The values shown here come from the supply zone Iserlohn 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.