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Sewage treatment plant, Mabton, Washington. NPDES permit WA0020648, in force until Jul 31, 2031. Last 12 months: no values over a limit, 55 required values missing, 2 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Temperature, water deg. centigrade | monthly average minimum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 4 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | weekly average | ≤ 3 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 10 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 24.2 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 36.3 lb/d | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | average | ≤ 72.6 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 108.8 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | average | ≤ 3.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum | ≤ 6.1 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average minimum | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | monthly average minimum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 100 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Alkalinity, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Hardness, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| E. coli | single reading | report only (#/100mL) (alert, not enforceable) | all year | 002 |
| Oil & grease, non-polar material | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | monthly average minimum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | monthly average minimum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average minimum | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | monthly total | report only (MGD) (alert, not enforceable) | all year | IN1 |
Cited limits by parameter: Washington's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WA0020648 · MCP: https://passage-data.com/mcp