Water body classification according to resolution 357/2005 from CONAMA
| . | . | Water body class . | |||
|---|---|---|---|---|---|
| Parameter . | Unity/Use . | 1 . | 2 . | 3 . | 4 . |
| Turbidity | NTU | ≤40 | 100 | 100 | – |
| BOD | mg L−1 | ≤3 | ≤5 | ≤10 | – |
| DO | mg L−1 | ≥6 | ≥5 | ≥4 | ≥2 |
| E. coli | (UFC/100 ml) | ≤200 | ≤1000 | ≤2,500 (recreation); ≤1000 (animal consumption); ≤4,000 (other uses) | – |
| Ammoniacal-N | mg L−1 | 3.7 (pH ≤ 7.5); 2.0 (7.5 < pH≤8.0); 1.0 (8.0 < pH ≤ 8.5); 0.5 (pH > 8.5) | 3.7 (pH ≤ 7.5); 2.0 (7.5 < pH ≤ 8.0); 1.0 (8.0 < pH ≤ 8.5); 0.5 (pH > 8.5) | 13.3 (pH ≤ 7.5); 5.6 (7.5 < pH ≤ 8.0); 2.2 (8.0 < pH ≤ 8.5); 1.0 (pH > 8.5) | – |
| Total nitrogen | mg L−1 | ≤2.18 | ≤2.18 | – | – |
| Nitrate | mg L−1 | ≤10 | ≤10 | ≤10 | – |
| Total phosphorus | mg L−1 | ≤0.1 | ≤0.1 | ≤0.15 | – |
| Human consumption use | After simplified treatment | After conventional treatment | After conventional or advanced treatment | Use for navigation and landscaping | |
| . | . | Water body class . | |||
|---|---|---|---|---|---|
| Parameter . | Unity/Use . | 1 . | 2 . | 3 . | 4 . |
| Turbidity | NTU | ≤40 | 100 | 100 | – |
| BOD | mg L−1 | ≤3 | ≤5 | ≤10 | – |
| DO | mg L−1 | ≥6 | ≥5 | ≥4 | ≥2 |
| E. coli | (UFC/100 ml) | ≤200 | ≤1000 | ≤2,500 (recreation); ≤1000 (animal consumption); ≤4,000 (other uses) | – |
| Ammoniacal-N | mg L−1 | 3.7 (pH ≤ 7.5); 2.0 (7.5 < pH≤8.0); 1.0 (8.0 < pH ≤ 8.5); 0.5 (pH > 8.5) | 3.7 (pH ≤ 7.5); 2.0 (7.5 < pH ≤ 8.0); 1.0 (8.0 < pH ≤ 8.5); 0.5 (pH > 8.5) | 13.3 (pH ≤ 7.5); 5.6 (7.5 < pH ≤ 8.0); 2.2 (8.0 < pH ≤ 8.5); 1.0 (pH > 8.5) | – |
| Total nitrogen | mg L−1 | ≤2.18 | ≤2.18 | – | – |
| Nitrate | mg L−1 | ≤10 | ≤10 | ≤10 | – |
| Total phosphorus | mg L−1 | ≤0.1 | ≤0.1 | ≤0.15 | – |
| Human consumption use | After simplified treatment | After conventional treatment | After conventional or advanced treatment | Use for navigation and landscaping | |
–: without limit defined. Source: CONAMA (2005).