Drinking water in 4125 (Switzerland)
For this postcode IWB (Industrielle Werke Basel) / Gemeindeverwaltung Riehen 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 2 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.
Brunnen Erlensträsschen / Polizeiposten (TRH10007)
IWB (Industrielle Werke Basel) / Gemeindeverwaltung RiehenAssigned 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 26/05/2025. 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 |
|---|---|---|---|---|
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
Show all recorded parameters (6 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | n.n. KBE/mL not detectable | 300 1/ml | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
| Intestinal enterococci | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
Indicator parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Coliform bacteria | n.n. KBE/100mL not detectable | — | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
| Temperature | 13.7 °C | — | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | 0.06 mg Cl2/L | 0.1 mg/l | — | Single value · Brunnen Erlensträsschen / Polizeiposten (TRH10007) |
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 2 more supply zones in this postcode
Unterdorfbrunnen (TRH10003)
IWB (Industrielle Werke Basel) / Gemeindeverwaltung RiehenAssigned 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 26/05/2025. 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 |
|---|---|---|---|---|
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Unterdorfbrunnen (TRH10003) |
Show all recorded parameters (6 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | n.n. KBE/mL not detectable | 300 1/ml | — | Single value · Unterdorfbrunnen (TRH10003) |
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Unterdorfbrunnen (TRH10003) |
| Intestinal enterococci | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Unterdorfbrunnen (TRH10003) |
Indicator parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Coliform bacteria | n.n. KBE/100mL not detectable | — | — | Single value · Unterdorfbrunnen (TRH10003) |
| Temperature | 16.9 °C | — | — | Single value · Unterdorfbrunnen (TRH10003) |
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | 0.04 mg Cl2/L | 0.1 mg/l | — | Single value · Unterdorfbrunnen (TRH10003) |
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.
Vorstadtbrunnen / Tramschleife (TRH10004)
IWB (Industrielle Werke Basel) / Gemeindeverwaltung RiehenAssigned 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 26/05/2025. 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 |
|---|---|---|---|---|
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
Show all recorded parameters (6 — most recent value per parameter)
Microbiology (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aerobic mesophilic bacteria | n.n. KBE/mL not detectable | 300 1/ml | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
| Escherichia coli (E. coli) | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
| Intestinal enterococci | n.n. KBE/100mL not detectable | 0/100 ml | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
Indicator parameters (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Coliform bacteria | n.n. KBE/100mL not detectable | — | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
| Temperature | 15.5 °C | — | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
Treatment substances (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Free chlorine | 0.05 mg Cl2/L | 0.1 mg/l | — | Single value · Vorstadtbrunnen / Tramschleife (TRH10004) |
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 4125
- Who supplies the drinking water in Postcode 4125?
- IWB (Industrielle Werke Basel) / Gemeindeverwaltung Riehen. The values shown here come from the supply zone Brunnen Erlensträsschen / Polizeiposten (TRH10007) 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.