Italy · Comune
Drinking water in Castellanza
One supply zone, published by Gruppo CAP (CAP Holding S.p.A.). 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 Castellanza
Gruppo CAP (CAP Holding S.p.A.)| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Sum of PFAS | 0,02 µg/l | 0.1 µg/l | 20 % | Median · Comune di Castellanza · Source [2] |
| Nitrate | 10 mg/l | 50 mg/l | 20 % | Median · Comune di Castellanza · Source [2] |
| Lead | < 2 µg/l below limit of quantification | 10 µg/l | < 20 % * | Maximum · Comune di Castellanza · Source [2] |
| Sulphate | 16 mg/l | 250 mg/l | 6 % | Median · Comune di Castellanza · Source [2] |
| Sodium | 8 mg/l | 200 mg/l | 4 % | Median · Comune di Castellanza · Source [2] |
* 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 (51 — most recent value per parameter)
Microbiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Intestinal enterococci | 0 UFC/100ml | 0/100 ml | — | Maximum · Median 0 · Comune di Castellanza · Source [2] |
Chemical parameters (31)
| 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 Castellanza · Source [2] |
| Alachlor | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Antimony | < 1,0 µg/l below limit of quantification | 10 µg/l | < 10 % * | Maximum · Comune di Castellanza · Source [2] |
| Arsenic | 2 µg/l | 10 µg/l | 20 % | Median · Comune di Castellanza · Source [2] |
| Atrazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Bentazone | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Benzene | < 0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Maximum · Comune di Castellanza · Source [2] |
| Boscalid | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Bromodichloromethane | < 0,9 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Chlorite | < 0,02 mg/l below limit of quantification | 0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid | — | Maximum · Comune di Castellanza · Source [2] |
| Chromium | < 5 µg/l below limit of quantification | 25 µg/l | < 20 % * | Maximum · Comune di Castellanza · Source [2] |
| Copper | < 5 µg/l below limit of quantification | 2 mg/l | < 0.3 % * | Maximum · Comune di Castellanza · Source [2] |
| Fluoride | < 0,20 mg/l below limit of quantification | 1.5 mg/l | < 13 % * | Maximum · Comune di Castellanza · Source [2] |
| Imidacloprid | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Lead | < 2 µg/l below limit of quantification | 10 µg/l | < 20 % * | Maximum · Comune di Castellanza · Source [2] |
| Mercury | < 0,3 µg/l below limit of quantification | 1 µg/l | < 30 % * | Maximum · Comune di Castellanza · Source [1] |
| Molinate | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Nitrate | 10 mg/l | 50 mg/l | 20 % | Median · Comune di Castellanza · Source [2] |
| Nitrite | 0,02 mg/l | 0.5 mg/l | 4 % | Maximum · Comune di Castellanza · Source [2] |
| Pesticides — Total | 0,01 µg/l | 0.5 µg/l | 2 % | Maximum · Comune di Castellanza · Source [1] |
| Polycyclic aromatic hydrocarbons | < 0,012 µg/l below limit of quantification | 0.1 µg/l | < 12 % * | Maximum · Comune di Castellanza · Source [1] |
| Propazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Selenium | < 1 µg/l below limit of quantification | 20 µg/l | < 5 % * | Maximum · Comune di Castellanza · Source [2] |
| Simazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Terbuthylazine | < 0,01 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [1] |
| Tetrachloroethene | < 0,9 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Tetrachloroethene and Trichloroethene (sum) | < 1 µg/l below limit of quantification | 10 µg/l | < 10 % * | Maximum · Comune di Castellanza · Source [2] |
| Trichloroethene | < 0,9 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Trichloromethane (chloroform) | < 0,9 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Trihalomethanes — Total | < 1 µg/l below limit of quantification | 30 µg/l | < 3 % * | Maximum · Comune di Castellanza · Source [2] |
| Uranium | 2 µg/l | 30 µg/l | 7 % | Median · Comune di Castellanza · Source [2] |
* 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 (3)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| HFPO-DA (GenX) | < 0,0010 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Perfluorodecane sulfonic acid (PFDS) | < 0,0010 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Sum of PFAS | 0,02 µg/l | 0.1 µg/l | 20 % | Median · Comune di Castellanza · Source [2] |
Indicator parameters (8)
| 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 Castellanza · Source [2] |
| Ammonium | < 0,10 mg/l below limit of quantification | 0.5 mg/l | < 20 % * | Maximum · Comune di Castellanza · Source [2] |
| Chloride | 7 mg/l | 250 mg/l | 3 % | Median · Comune di Castellanza · Source [2] |
| Colony count 22 °C | 7 UFC/100ml | senza variazioni anomale | — | Median · Comune di Castellanza · Source [2] |
| pH | 7,9 unita pH | 6,5–9,5 | — | Median · Comune di Castellanza · Source [2] |
| Sodium | 8 mg/l | 200 mg/l | 4 % | Median · Comune di Castellanza · Source [2] |
| Sulphate | 16 mg/l | 250 mg/l | 6 % | Median · Comune di Castellanza · Source [2] |
| Turbidity | 0,15 NTU | accettabile per i consumatori, senza variazioni anomale | — | Maximum · Comune di Castellanza · Source [2] |
* 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.
Radiology (1)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Radon-222 | 5,8 Bq/l | — | — | Maximum · Comune di Castellanza · Source [2] |
Further parameters (7)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Barium | < 0,1 µg/l below limit of quantification | — | — | Maximum · Comune di Castellanza · Source [2] |
| Calcium | 40 mg/l | — | — | Median · Comune di Castellanza · Source [2] |
| Dry residue | 174 mg/l | — | — | Median · Comune di Castellanza · Source [2] |
| Hydrogen carbonate | 305 mg/l | — | — | Median · Comune di Castellanza · Source [1] |
| Potassium | 1 mg/l | — | — | Median · Comune di Castellanza · Source [2] |
| Vanadium | < 5 µg/l below limit of quantification | 0.14 mg/l | < 4 % * | Maximum · Comune di Castellanza · Source [2] |
| Zinc | 32 µg/l | — | — | Median · Comune di Castellanza · Source [2] |
* 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).