Drinking water in Jona
6 supply zones — values can differ depending on the district. Below is the zone with the most documented parameters, the others collapsed underneath. To determine the exact match, look up the postcode.
How to read the share of the parametric value
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.
Rapperswil-Jona: Druckzone Bollingen
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Druckzone Bollingen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Bollingen |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 20 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Druckzone Bollingen |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Bollingen |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Bollingen |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Druckzone Bollingen |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.6 | — | — | Mean · Rapperswil-Jona: Druckzone Bollingen |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 90 mg/l | — | — | Mean · Rapperswil-Jona: Druckzone Bollingen |
| Magnesium | 17 mg/l | — | — | Mean · Rapperswil-Jona: Druckzone Bollingen |
| Total hardness | 33 °fH | — | — | Mean · Rapperswil-Jona: Druckzone Bollingen |
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.
Postcodes in this zone: 8645
Show 5 more supply zones
Rapperswil-Jona: Druckzone Weid
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15 mg/l | 40 mg/l | 38 % | Mean · Rapperswil-Jona: Druckzone Weid |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Weid |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 5 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Druckzone Weid |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Weid |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Druckzone Weid |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15 mg/l | 40 mg/l | 38 % | Mean · Rapperswil-Jona: Druckzone Weid |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.4 | — | — | Mean · Rapperswil-Jona: Druckzone Weid |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 54 mg/l | — | — | Mean · Rapperswil-Jona: Druckzone Weid |
| Magnesium | 7 mg/l | — | — | Mean · Rapperswil-Jona: Druckzone Weid |
| Total hardness | 35 °fH | — | — | Mean · Rapperswil-Jona: Druckzone Weid |
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.
Postcodes in this zone: 8645
Rapperswil-Jona: Obere Druckzone Ost
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15 mg/l | 40 mg/l | 38 % | Mean · Rapperswil-Jona: Obere Druckzone Ost |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone Ost |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 4 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Obere Druckzone Ost |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone Ost |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone Ost |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 15 mg/l | 40 mg/l | 38 % | Mean · Rapperswil-Jona: Obere Druckzone Ost |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.4 | — | — | Mean · Rapperswil-Jona: Obere Druckzone Ost |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 54 mg/l | — | — | Mean · Rapperswil-Jona: Obere Druckzone Ost |
| Magnesium | 7 mg/l | — | — | Mean · Rapperswil-Jona: Obere Druckzone Ost |
| Total hardness | 30 °fH | — | — | Mean · Rapperswil-Jona: Obere Druckzone Ost |
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.
Postcodes in this zone: 8645
Rapperswil-Jona: Obere Druckzone West
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 4 mg/l | 40 mg/l | 10 % | Mean · Rapperswil-Jona: Obere Druckzone West |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone West |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 4 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Obere Druckzone West |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone West |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Obere Druckzone West |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 4 mg/l | 40 mg/l | 10 % | Mean · Rapperswil-Jona: Obere Druckzone West |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.7 | — | — | Mean · Rapperswil-Jona: Obere Druckzone West |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 54 mg/l | — | — | Mean · Rapperswil-Jona: Obere Druckzone West |
| Magnesium | 7 mg/l | — | — | Mean · Rapperswil-Jona: Obere Druckzone West |
| Total hardness | 18 °fH | — | — | Mean · Rapperswil-Jona: Obere Druckzone West |
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.
Postcodes in this zone: 8645
Rapperswil-Jona: Untere Druckzone Ost
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Untere Druckzone Ost |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone Ost |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 20 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Untere Druckzone Ost |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone Ost |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone Ost |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Untere Druckzone Ost |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.6 | — | — | Mean · Rapperswil-Jona: Untere Druckzone Ost |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 90 mg/l | — | — | Mean · Rapperswil-Jona: Untere Druckzone Ost |
| Magnesium | 17 mg/l | — | — | Mean · Rapperswil-Jona: Untere Druckzone Ost |
| Total hardness | 33 °fH | — | — | Mean · Rapperswil-Jona: Untere Druckzone Ost |
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.
Postcodes in this zone: 8645
Rapperswil-Jona: Untere Druckzone West
Genossenschaft Wasserversorgung Rapperswil-JonaAssigned 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 31/12/2023. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Untere Druckzone West |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone West |
Show all recorded parameters (8 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | 20 KBE/ml | 300 1/ml | — | Mean · Rapperswil-Jona: Untere Druckzone West |
| Escherichia coli (E. coli) | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone West |
| Intestinal enterococci | 0 KBE/100ml | 0/100 ml | — | Maximum · Median 0 · Rapperswil-Jona: Untere Druckzone West |
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 10 mg/l | 40 mg/l | 25 % | Mean · Rapperswil-Jona: Untere Druckzone West |
Indicator parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| pH | 7.6 | — | — | Mean · Rapperswil-Jona: Untere Druckzone West |
Further parameters (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 90 mg/l | — | — | Mean · Rapperswil-Jona: Untere Druckzone West |
| Magnesium | 17 mg/l | — | — | Mean · Rapperswil-Jona: Untere Druckzone West |
| Total hardness | 33 °fH | — | — | Mean · Rapperswil-Jona: Untere Druckzone West |
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.
Postcodes in this zone: 8645
Frequently asked questions about drinking water in Jona
- How hard is the water in Jona?
- Genossenschaft Wasserversorgung Rapperswil-Jona publishes a total hardness of 33 °fH for the supply zone Rapperswil-Jona: Druckzone Bollingen — that corresponds to 18.5 °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: 2023, retrieved on 07/08/2026.
- How much nitrate is in the drinking water in Jona?
- Genossenschaft Wasserversorgung Rapperswil-Jona publishes a nitrate value of 10 mg/l for the supply zone Rapperswil-Jona: Druckzone Bollingen. The statutory parametric value is 40 mg/l; the measured value represents 25 % of the parametric value. Basis: 2023, retrieved on 07/08/2026.
- Who supplies the drinking water in Jona?
- Genossenschaft Wasserversorgung Rapperswil-Jona. The values shown here come from the supply zone Rapperswil-Jona: Druckzone Bollingen 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.