Table 1 Water quality standards by BIS, UNECE and WHO.
From: Physicochemical and biological analysis of river Yamuna at Palla station from 2009 to 2019
Parameters | Class | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
IS 2296:1992 | UNECE 199427 | WHO | |||||||||
A | B | C | D | E | I | II | III | IV | V | ||
DO (%) un-stratified water | – | – | – | – | – | 90–70 | 70–50 | 50–30 | 30–10 | < 10 | – |
DO (mg/l) | ≥ 6 | ≥ 5 | ≥ 4 | ≥ 4 | – | > 7 | 7–6 | 6–4 | 4–3 | < 3 | 5 |
BOD (mg/l) | ≤ 2 | ≤ 3 | ≤ 4 | – | – | – | – | – | – | – | – |
COD (mg/l) | – | – | – | – | – | < 3 | 3–10 | 10–20 | 20–30 | > 30 | 10 |
TDS (mg/l) | ≤ 500 | – | ≤ 1500 | – | ≤ 2100 | – | – | – | – | – | 500 |
Total alkalinity (mg/l) | 200 | – | – | – | – | > 200 | 200–100 | 100–20 | 20–10 | < 10 | 200 |
Total coliform (MPN/100 ml) max | 50 | 500 | 5000 | – | – | – | – | – | – | – | 0 |
