How hard is the water in Niederkassel?

Stadtwerke Niederkassel publishes the hardness range 11,8 for the supply zone Niederkassel. 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 Niederkassel?

Stadtwerke Niederkassel. The values shown here come from the supply zone Niederkassel 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 Niederkassel

One supply zone, water supplier: Stadtwerke Niederkassel.

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.

Niederkassel

Stadtwerke Niederkassel

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

Hardness range 11,8

Key values Niederkassel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	26,0 Unit not stated in the document	50 mg/l	—	Single value · Niederkassel
Lead	n.n. not detectable Unit not stated in the document	10 µg/l	—	Single value · Niederkassel
Sodium	17,0 Unit not stated in the document	200 mg/l	—	Single value · Niederkassel

Show all recorded parameters (20 — most recent value per parameter)

Chemical parameters (10)

Chemical parameters – Niederkassel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Arsenic	n.n. not detectable Unit not stated in the document	10 µg/l	—	Single value · Niederkassel
Cadmium	n.n. not detectable Unit not stated in the document	3 µg/l	—	Single value · Niederkassel
Chromium	n.n. not detectable Unit not stated in the document	25 µg/l	—	Single value · Niederkassel
Cyanide	n.n. not detectable Unit not stated in the document	50 µg/l	—	Single value · Niederkassel
Fluoride	n.n. not detectable Unit not stated in the document	1.5 mg/l	—	Single value · Niederkassel
Lead	n.n. not detectable Unit not stated in the document	10 µg/l	—	Single value · Niederkassel
Mercury	n.n. not detectable Unit not stated in the document	1 µg/l	—	Single value · Niederkassel
Nickel	n.n. not detectable Unit not stated in the document	20 µg/l	—	Single value · Niederkassel
Nitrate	26,0 Unit not stated in the document	50 mg/l	—	Single value · Niederkassel
Nitrite	n.n. not detectable Unit not stated in the document	0.5 mg/l	—	Single value · Niederkassel

Indicator parameters (6)

Indicator parameters – Niederkassel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	n.n. not detectable Unit not stated in the document	0.2 mg/l	—	Single value · Niederkassel
Ammonium	n.n. not detectable Unit not stated in the document	0.5 mg/l	—	Single value · Niederkassel
Chloride	26,0 Unit not stated in the document	250 mg/l	—	Single value · Niederkassel
Iron	n.n. not detectable Unit not stated in the document	0.2 mg/l	—	Single value · Niederkassel
Manganese	n.n. not detectable Unit not stated in the document	50 µg/l	—	Single value · Niederkassel
Sodium	17,0 Unit not stated in the document	200 mg/l	—	Single value · Niederkassel

Further parameters (4)

Further parameters – Niederkassel
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	62,0	—	—	Single value · Niederkassel
Hardness range (WRMG)	2 bzw. mittel	—	—	Single value · Niederkassel
Magnesium	11,0	—	—	Single value · Niederkassel
Potassium	2,9	—	—	Single value · Niederkassel

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-niederkassel.de/fileadmin/dateien/Dokumente_Downloadcenter/Auszug_amtliche_Trinkwasseranalyse.pdf · retrieved on 11/07/2026

Postcodes in this zone: 53859

Frequently asked questions about drinking water in Niederkassel

How hard is the water in Niederkassel?: Stadtwerke Niederkassel publishes the hardness range 11,8 for the supply zone Niederkassel. 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 Niederkassel?: Stadtwerke Niederkassel. The values shown here come from the supply zone Niederkassel 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.