Table 1 Guideline Values of different analytes in drinking water recommended by various international regulatory agencies.
S.N. | Analyte | Unit | BIS limit (D.L.–P.L.) | Italian Law D.L. 31/2001 drinking water34 | Italian Law DM 29/12/2003 mineral water35 | EU directive 1998/83/EC drinking water36 | EU directive 2003/40/EC mineral water37 | US-EPA guideline value | WHO guideline value |
|---|---|---|---|---|---|---|---|---|---|
1 | pH | – | 6.5–8.5 | > 6.5– < 9.5 (g.v.) | – | > 6.5– < 9.5 (g.v.) | – | > 6.5– < 8.5 | – |
2 | EC | µS cm-1 | – | 2500 (g.v.) | – | 2500 (g.v.) | – | - | 1500 |
3 | TDS | mg l−1 | 500–2000 | 1000 | |||||
4 | Al | μg l−1 | 30–200 | 200 (g.v.) | – | 200 (g.v.) | – | – | 200* |
5 | Cr | 50–NR | 50 | 50 | 50 | 50 | 100 | 50 | |
6 | Mn | 100–300 | 50 (g.v.) | 500 | 50 (g.v.) | 500 | – | 400 | |
7 | Co | – | – | – | – | – | – | ||
8 | Ni | 20–NR | – | 20 | 20 | 20 | – | 70 | |
9 | Cu | 50–1500 | 1000 | 1000 | 2000 | 1000 | 1300 | 2000 | |
10 | Zn | 5000–15,000 | – | – | – | – | – | 4000* | |
11 | Cd | 3–NR | 5 | 3 | 5 | 3 | 5 | 3 | |
12 | Pb | 10–NR | 10 | 10 | 10 | 10 | 15 | 10 |
