How hard is the water in Bizau?

Castel San Pietro publishes a total hardness of 17.4 °fH for the supply zone Castel San Pietro — that corresponds to 9.7 °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: 2021, retrieved on 07/08/2026.

How much nitrate is in the drinking water in Bizau?

Castel San Pietro publishes a nitrate value of 4.6 mg/l for the supply zone Castel San Pietro. The statutory parametric value is 40 mg/l; the measured value represents 12 % of the parametric value. Basis: 2021, retrieved on 07/08/2026.

Who supplies the drinking water in Bizau?

Castel San Pietro. The values shown here come from the supply zone Castel San Pietro 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 Bizau

One supply zone, water supplier: Castel San Pietro.

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.

Castel San Pietro

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 31/12/2021. 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

9.7 °dH

Hardness range medium

Key values Castel San Pietro
Parameter	Value	Parametric value	Share of the parametric value	Reference
Nitrate	4.6 mg/l	40 mg/l	12 %	Mean · Castel San Pietro
Escherichia coli (E. coli)	0 KBE/100ml	0/100 ml	—	Maximum · Median 0 · Castel San Pietro
Sulphate	37 mg/l	—	—	Mean · Castel San Pietro
Sodium	1.2 mg/l	200 mg/l	0.6 %	Mean · Castel San Pietro

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

Microbiology (3)

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

Chemical parameters (2)

Chemical parameters – Castel San Pietro
Parameter	Value	Parametric value	Share of the parametric value	Reference
Fluoride	0.2 mg/l	1.5 mg/l	13 %	Mean · Castel San Pietro
Nitrate	4.6 mg/l	40 mg/l	12 %	Mean · Castel San Pietro

Indicator parameters (9)

Indicator parameters – Castel San Pietro
Parameter	Value	Parametric value	Share of the parametric value	Reference
Chloride	8.8 mg/l	—	—	Mean · Castel San Pietro
Conductivity (25 °C)	337 µS/cm	—	—	Mean · Castel San Pietro
Iron	0.17 mg/l	0.2 mg/l	85 %	Mean · Castel San Pietro
Manganese	0.01 mg/l	50 µg/l	20 %	Mean · Castel San Pietro
pH	8.05	—	—	Mean · Castel San Pietro
Sodium	1.2 mg/l	200 mg/l	0.6 %	Mean · Castel San Pietro
Sulphate	37 mg/l	—	—	Mean · Castel San Pietro
Temperature	12.5 °C	—	—	Mean · Castel San Pietro
Turbidity	0.5 TE/F	—	—	Mean · Castel San Pietro

Further parameters (6)

Further parameters – Castel San Pietro
Parameter	Value	Parametric value	Share of the parametric value	Reference
Calcium	56.4 mg/l	—	—	Mean · Castel San Pietro
Dissolved organic carbon (DOC)	0.7 mg/l	—	—	Mean · Castel San Pietro
Hydrogen carbonate	192 mg/l	—	—	Mean · Castel San Pietro
Magnesium	8.5 mg/l	—	—	Mean · Castel San Pietro
Potassium	0.4 mg/l	—	—	Mean · Castel San Pietro
Total hardness	17.4 °fH	—	—	Mean · Castel San Pietro

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://trinkwasser.ch/de/versorger/737/castel-san-pietro/503/castel-san-pietro · 2021 · 2021 · retrieved on 07/08/2026

Postcodes in this zone: 6874

Frequently asked questions about drinking water in Bizau

How hard is the water in Bizau?: Castel San Pietro publishes a total hardness of 17.4 °fH for the supply zone Castel San Pietro — that corresponds to 9.7 °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: 2021, retrieved on 07/08/2026.
How much nitrate is in the drinking water in Bizau?: Castel San Pietro publishes a nitrate value of 4.6 mg/l for the supply zone Castel San Pietro. The statutory parametric value is 40 mg/l; the measured value represents 12 % of the parametric value. Basis: 2021, retrieved on 07/08/2026.
Who supplies the drinking water in Bizau?: Castel San Pietro. The values shown here come from the supply zone Castel San Pietro 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.