Drinking water in 1803 (Switzerland)
The drinking water in Postcode 1803 has a total hardness of 7.6 °dH. Nitrate reaches 2.9 mg/L, the statutory parametric value is 40 mg/l. Measured in supply zone Eau du Léman of SIGE (Service Intercommunal de Gestion), retrieved on 19/08/2026.
For this postcode SIGE (Service Intercommunal de Gestion) 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 10 underneath.
The values come from the SVGW platform trinkwasser.ch. Water utilities report there voluntarily; the SVGW does not verify the data. For each parameter, the minimum, maximum, average and median of one year are published; hardness in French degrees (°fH). On 20 August 2026 the SVGW objected in writing to the use of this data for maunawai.info: we do not show values from this source, but only name the parameters measured there. Analyses we obtained directly from the water supplier are shown in full.
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.
Eau du Léman
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 2.9 mg/L | 40 mg/l | 7 % | Median · Eau du Léman |
Show all recorded parameters (2 — most recent value per parameter)
Chemical parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 2.9 mg/L | 40 mg/l | 7 % | Median · Eau du Léman |
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 13.5 °F | — | — | Mean · Eau du Léman |
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.
Show 10 more supply zones in this postcode
Grande source des Avants
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 24.8 °F | — | — | Mean · Grande source des Avants |
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.
Réseau inférieur de Montreux
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 19.0 °F | — | — | Mean · Réseau inférieur de Montreux |
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.
Réseau inférieur de Vevey
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 15.3 °F | — | — | Mean · Réseau inférieur de Vevey |
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.
Réseau moyen de Montreux
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 30.6 °F | — | — | Mean · Réseau moyen de Montreux |
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.
Réseau supérieur de Montreux
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 22.3 °F | — | — | Mean · Réseau supérieur de Montreux |
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.
Réseau supérieur de Vevey
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 24.5 °F | — | — | Mean · Réseau supérieur de Vevey |
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 de Cheset
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 21.4 °F | — | — | Mean · Source de Cheset |
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 du Bouveret supérieur
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 15.8 °F | — | — | Mean · Source du Bouveret supérieur |
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 du Confin du Renard
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 29.4 °F | — | — | Mean · Source du Confin du Renard |
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 tunnel autoroute A9
SIGE (Service Intercommunal de Gestion)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 31/12/2024. 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.
No core values are available for this zone yet.
Show all recorded parameters (1 — most recent value per parameter)
Further parameters (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Total hardness | 29.7 °F | — | — | Mean · Source tunnel autoroute A9 |
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.
Frequent questions about postcode 1803
- How hard is the water in Postcode 1803?
- SIGE (Service Intercommunal de Gestion) publishes a total hardness of 13.5 °F for the supply zone Eau du Léman — that corresponds to 7.6 °dH. Hardness indicates how much calcium and magnesium are dissolved in the water. It is not a quality assessment: there is no parametric value for hardness. Basis: Avril 2025, retrieved on 19/08/2026.
- How much nitrate is in the drinking water in Postcode 1803?
- SIGE (Service Intercommunal de Gestion) publishes a nitrate value of 2.9 mg/L for the supply zone Eau du Léman. The statutory parametric value is 40 mg/l; the measured value represents 7 % of the parametric value. Basis: Avril 2025, retrieved on 19/08/2026.
- Who supplies the drinking water in Postcode 1803?
- SIGE (Service Intercommunal de Gestion). The values shown here come from the supply zone Eau du Léman 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.