How hard is the water in Ottrau?

Gemeinde Ottrau publishes a total hardness of 4.2 °dH for the supply zone Ottrau/Immichenhain (hardness range weich). 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: 24.10.2024, retrieved on 14/07/2026.

Who supplies the drinking water in Ottrau?

Gemeinde Ottrau. The values shown here come from the supply zone Ottrau/Immichenhain 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 Ottrau

One supply zone, water supplier: Gemeinde Ottrau.

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.

Ottrau/Immichenhain

Gemeinde Ottrau

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 24/10/2024. 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.

Water hardness

4.2 °dH

Hardness range weich

Key values Ottrau/Immichenhain
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sodium	4,7 mg/l	200 mg/l	2 %	Single value · Ottrau/Immichenhain

Show all recorded parameters (5 — most recent value per parameter)

Indicator parameters (1)

Indicator parameters – Ottrau/Immichenhain
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sodium	4,7 mg/l	200 mg/l	2 %	Single value · Ottrau/Immichenhain

Further parameters (4)

Further parameters – Ottrau/Immichenhain
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	13,8 mg/l	—	—	Single value · Ottrau/Immichenhain
Hardness range (WRMG)	weich	—	—	Single value · Ottrau/Immichenhain
Magnesium	6,2 mg/l	—	—	Single value · Ottrau/Immichenhain
Total hardness	4,21 °dH	—	—	Single value · Ottrau/Immichenhain

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.ottrau.de/rathaus-politik/informationen/wasserwerte/ · 24.10.2024 · retrieved on 14/07/2026

Postcodes in this zone: 34633

Frequently asked questions about drinking water in Ottrau

How hard is the water in Ottrau?: Gemeinde Ottrau publishes a total hardness of 4.2 °dH for the supply zone Ottrau/Immichenhain (hardness range weich). 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: 24.10.2024, retrieved on 14/07/2026.
Who supplies the drinking water in Ottrau?: Gemeinde Ottrau. The values shown here come from the supply zone Ottrau/Immichenhain 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.