Italy · Comune
Drinking water in Alserio
One supply zone, published by Como Acqua 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 Alserio Fontana P.zza Mazzini
Como Acqua S.r.l.| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Nitrate | 26 mg/L | 50 mg/l | 52 % | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Lead | < 1 µg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Escherichia coli (E. coli) | < 1 MPN/100ml below limit of quantification | 0/100 ml | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Sulphate | 19 mg/L | 250 mg/l | 8 % | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Sodium | < 15 mg/L below limit of quantification | 200 mg/l | < 8 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
* 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 (44 — most recent value per parameter)
Microbiology (2)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Escherichia coli (E. coli) | < 1 MPN/100ml below limit of quantification | 0/100 ml | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Intestinal enterococci | < 1 UFC/100 mL below limit of quantification | 0/100 ml | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
Chemical parameters (21)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| 1,2-dichloroethane | < 0.2 µg/L below limit of quantification | 3 µg/l | < 7 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Antimony | < 1 µg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Arsenic | < 1 µg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Benzene | < 0.2 µg/L below limit of quantification | 1 µg/l | < 20 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Boron | < 0.05 mg/L below limit of quantification | 1.5 mg/l | < 3 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Cadmium | < 1.0 µg/L below limit of quantification | 5 µg/l | < 20 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Chlorate | < 0.05 mg/L below limit of quantification | 0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Chlorite | < 0.05 mg/L below limit of quantification | 0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Chromium | < 5 µg/L below limit of quantification | 25 µg/l | < 20 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Copper | < 0.05 mg/L below limit of quantification | 2 mg/l | < 3 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Fluoride | < 0.20 mg/L below limit of quantification | 1.5 mg/l | < 13 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Lead | < 1 µg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Mercury | < 0.25 µg/L below limit of quantification | 1 µg/l | < 25 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Nickel | < 5 µg/L below limit of quantification | 20 µg/l | < 25 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Nitrate | 26 mg/L | 50 mg/l | 52 % | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Nitrite | < 0.05 mg/L below limit of quantification | 0.5 mg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Selenium | < 5 µg/L below limit of quantification | 20 µg/l | < 25 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Tetrachloroethene and Trichloroethene (sum) | < 1 µg/L below limit of quantification | 10 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Trihalomethanes — Total | < 4 µg/L below limit of quantification | 30 µg/l | < 13 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Uranium | < 1 µg/L below limit of quantification | 30 µg/l | < 3 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Vinyl chloride | < 0.08 µg/L below limit of quantification | 0.5 µg/l | < 16 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
* 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.
Indicator parameters (15)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Aluminium | < 10 µg/L below limit of quantification | 0.2 mg/l | < 5 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Ammonium | < 0.02 mg/L below limit of quantification | 0.5 mg/l | < 4 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Chloride | 16 mg/L | 250 mg/l | 6 % | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Coliform bacteria | < 1 MPN/100ml below limit of quantification | 0/100 ml | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Colony count 22 °C | 3 UFC/1ml | senza variazioni anomale | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Colour | Accettabile | accettabile per i consumatori, senza variazioni anomale | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Conductivity (25 °C) | 565 µS/cm a 20°C | 2,500 µS/cm | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Iron | < 10 µg/L below limit of quantification | 0.2 mg/l | < 5 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Manganese | < 5 µg/L below limit of quantification | 50 µg/l | < 10 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Odour | Accettabile | accettabile per i consumatori, senza variazioni anomale | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| pH | 7.88 Unità pH | 6,5–9,5 | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Sodium | < 15 mg/L below limit of quantification | 200 mg/l | < 8 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Sulphate | 19 mg/L | 250 mg/l | 8 % | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Taste | Accettabile | accettabile per i consumatori, senza variazioni anomale | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Turbidity | 0.19 NTU | accettabile per i consumatori, senza variazioni anomale | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
* 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 (6)
| Parameter | Value | Parametric value | Share of the parametric value | Reference |
|---|---|---|---|---|
| Calcium | 92 mg/L | — | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Dry residue | 351 mg/L | — | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Magnesium | 14 mg/L | — | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Potassium | < 5 mg/L below limit of quantification | — | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Total hardness | 29 °F | — | — | Single value · Comune di Alserio Fontana P.zza Mazzini |
| Vanadium | < 10 µg/L below limit of quantification | 0.14 mg/l | < 7 % * | Single value · Comune di Alserio Fontana P.zza Mazzini |
* 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).