Table 2.
Water quality standards for Class A surface water vs. drinking water.
| Parameters | Standard Values | |
|---|---|---|
| Surface Water Bodies | Drinking Water | |
| Class A * | Quality Standards | |
| pH | 6.5–8.5 | 6.0–8.5 |
| DO (mg/L) | ≥6.5 | ** |
| BOD (mg/L) | ≤1 | -- |
| Solids (mg/L) | ≤25 (suspended solids) | ≤ 500 (total dissolved solids) |
| E. coli | ≤50 | ≤6 |
| (CFU/100 mL) | ||
| NH3-N (mg/L) | ≤0.1 | ≤0.1 |
| TP (mg/L) | ≤0.02 | -- |
* Class A water bodies may be used for Class 1 public water, swimming and as other class water bodies. Class 1 public water means water sources that have been disinfected and can be used as public water supplies. ** Not specified.