Italy · Comune
Drinking water in Gerenzano
One supply zone, published by ALFA S.r.l.. The values come from the publications of the Italian water suppliers (gestori), which D.Lgs. 18/2023 requires of them from 12 January 2026. Italian parametric values apply: trihalomethanes 30 instead of 50 µg/l, chromium 25 µg/l, uranium 30 instead of 10 µg/l; for hardness there is no maximum value, it is given in French degrees (°F).
Comune di Gerenzano
ALFA S.r.l.| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,002 ug/l | 0.1 µg/l | 2 % | Median · Comune di Gerenzano · Source [2] |
| Nitrate | 23 mg/l | 50 mg/l | 46 % | Median · Comune di Gerenzano · Source [1] |
| Lead | < 1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Escherichia coli (E. coli) | 0 UFC/100ml | 0/100 ml | — | Maximum · Median 0 · Comune di Gerenzano · Source [1] |
| Sulphate | 10 mg/l | 250 mg/l | 4 % | Median · Comune di Gerenzano · Source [1] |
| Sodium | 8 mg/l | 200 mg/l | 4 % | Median · Comune di Gerenzano · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Show all recorded parameters (57 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | 0 UFC/100ml | 0/100 ml | — | Maximum · Median 0 · Comune di Gerenzano · Source [1] |
| Intestinal enterococci | 0 UFC/100ml | 0/100 ml | — | Maximum · Median 0 · Comune di Gerenzano · Source [1] |
Chemical parameters (32)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0,9 µg/l below limit of quantification | 3 µg/l | < 30 % * | Maximum · Comune di Gerenzano · Source [1] |
| Alachlor | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Antimony | < 1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Arsenic | 2 µg/l | 10 µg/l | 20 % | Median · Comune di Gerenzano · Source [1] |
| Atrazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Bentazone | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Benzene | < 0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Maximum · Comune di Gerenzano · Source [1] |
| Boron | 0,1 mg/l | 1.5 mg/l | 7 % | Maximum · Comune di Gerenzano · Source [1] |
| Bromodichloromethane | < 1 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Cadmium | < 1,0 µg/l below limit of quantification | 5 µg/l | < 20 % * | Maximum · Comune di Gerenzano · Source [1] |
| Chlorate | < 0,05 mg/l below limit of quantification | 0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid | — | Maximum · Comune di Gerenzano · Source [2] |
| Chlorite | < 0,05 mg/l below limit of quantification | 0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid | — | Maximum · Comune di Gerenzano · Source [2] |
| Chromium | < 5 µg/l below limit of quantification | 50 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Copper | < 0,2 mg/l below limit of quantification | 2 mg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Dibromochloromethane | < 1 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Fluoride | 0,1 mg/l | 1.5 mg/l | 7 % | Median · Comune di Gerenzano · Source [2] |
| Lead | < 1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Molinate | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Nickel | < 2 µg/l below limit of quantification | 20 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Nitrate | 23 mg/l | 50 mg/l | 46 % | Median · Comune di Gerenzano · Source [1] |
| Nitrite | < 0,05 mg/l below limit of quantification | 0.5 mg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Pesticides — Total | 0,06 µg/l | 0.5 µg/l | 12 % | Median · Comune di Gerenzano · Source [1] |
| Propazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Selenium | < 1 µg/l below limit of quantification | 20 µg/l | < 5 % * | Maximum · Comune di Gerenzano · Source [1] |
| Simazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Terbuthylazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Tetrachloroethene | 2 µg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Tetrachloroethene and Trichloroethene (sum) | 4 µg/l | 10 µg/l | 40 % | Median · Comune di Gerenzano · Source [1] |
| Tribromomethane (bromoform) | < 1 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Trichloroethene | 2 µg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Trichloromethane (chloroform) | < 1 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Trihalomethanes — Total | < 1 µg/l below limit of quantification | 30 µg/l | < 3 % * | Maximum · Comune di Gerenzano · Source [3] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
PFAS (4)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| HFPO-DA (GenX) | < 0,0010 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [2] |
| Perfluorodecane sulfonic acid (PFDS) | < 0,0010 µg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [2] |
| Sum of 4 PFAS | 0,0017 ug/l | 20 ng/l | 9 % | Median · Comune di Gerenzano · Source [2] |
| Sum of PFAS | 0,002 ug/l | 0.1 µg/l | 2 % | Median · Comune di Gerenzano · Source [2] |
Indicator parameters (11)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 20 µg/l below limit of quantification | 0.2 mg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| Ammonium | < 0,10 mg/l below limit of quantification | 0.5 mg/l | < 20 % * | Maximum · Comune di Gerenzano · Source [1] |
| Chloride | 6 mg/l | 250 mg/l | 2 % | Median · Comune di Gerenzano · Source [1] |
| Coliform bacteria | 0 UFC/100ml | 0/100 ml | — | Maximum · Median 0 · Comune di Gerenzano · Source [1] |
| Colony count 22 °C | 2 UFC/1ml | senza variazioni anomale | — | Median · Comune di Gerenzano · Source [1] |
| Iron | 9 µg/l | 0.2 mg/l | 5 % | Median · Comune di Gerenzano · Source [2] |
| Manganese | < 5 µg/l below limit of quantification | 50 µg/l | < 10 % * | Maximum · Comune di Gerenzano · Source [1] |
| pH | 7,6 pH_unit | 6,5–9,5 | — | Median · Comune di Gerenzano · Source [1] |
| Sodium | 8 mg/l | 200 mg/l | 4 % | Median · Comune di Gerenzano · Source [1] |
| Sulphate | 10 mg/l | 250 mg/l | 4 % | Median · Comune di Gerenzano · Source [1] |
| Turbidity | 0,23 NTU | accettabile per i consumatori, senza variazioni anomale | — | Median · Comune di Gerenzano · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
Further parameters (8)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Barium | < 2 mg/l below limit of quantification | — | — | Maximum · Comune di Gerenzano · Source [1] |
| Calcium | 40 mg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Dry residue | 199 mg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Magnesium | 8 mg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Potassium | 1 mg/l | — | — | Median · Comune di Gerenzano · Source [1] |
| Total hardness | 13,3 ° f | — | — | Median · Comune di Gerenzano · Source [1] |
| Vanadium | < 10 µg/l below limit of quantification | 0.14 mg/l | < 7 % * | Maximum · Comune di Gerenzano · Source [1] |
| Zinc | 11 µg/l | — | — | Median · Comune di Gerenzano · Source [1] |
* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.
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.
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.
Legal basis: Art. 18 D.Lgs. 18/2023 as amended by D.Lgs. 102/2025 (transposition of EU Directive 2020/2184). The values are not official — the publication of the Gestore, to which every row links, remains authoritative. Assignment of the comune: information in the analysis document, resolved against the municipality list of ISTAT (territorial status 01.01.2026, CC BY 4.0).