所屬科目:水質檢驗
| 水質/項目 | 未(稍)受污染 | 輕度污染 | 中度污染 | 嚴重污染 |
| 溶氧量(DO) (mg/L) | DO≧6.5 | 6.5>DO≧4.6 | 4.5≧DO≧2.0 | DO<2.0 |
| 生化需氧量(BOD5) (mg/L) | BOD5≦3.0 | 3.0<BOD5≦4.9 | 5.0≦BOD5≦15.0 | BOD5>15.0 |
| 懸浮固體(SS) (mg/L) | SS≦20.0 | 20.0<SS≦49.9 | 50.0≦SS≦100 | SS>100 |
| 氨氮(NH3-N) (mg/L) | NH3-N≦0.50 | 0.50<NH3-N≦0.99 | 1.00≦NH3-N≦3.00 | NH3-N>3.00 |
| 點數 | 1 | 3 | 6 | 10 |
| 污染指數積分值 (S) | S≦2.0 | 2.0<S≦3.0 | 3.1≦S≦6.0 | S>6.0 |