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Sewage treatment plant, Clarkston, Washington. NPDES permit WA0021113 expired Apr 30, 2021; its limits still apply. Last 12 months: no values over a limit, 11 required values missing. 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 | maximum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 8.5 SU | all year | 001 |
| pH | daily maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 550 lb/d | all year | 001 |
| Solids, total suspended | monthly average | ≤ 550 lb/d | all year | 001 |
| Solids, total suspended | monthly average | ≤ 550 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | monthly average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | monthly average | report only (MGD) (alert, not enforceable) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 459 lb/d | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| BOD, 5-day, 20 deg. C | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| BOD, 5-day, 20 deg. C | single reading | report only (lb/d) (alert, not enforceable) | all year | 001Q |
| BOD, 5-day, 20 deg. C | single reading | report only (lb/d) (alert, not enforceable) | all year | 001Q |
| Alkalinity, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Alkalinity, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Phosphorus, dissolved reactive [drp as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Phosphorus, dissolved reactive [drp as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Hardness, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Hardness, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001Q |
| Temperature, water deg. centigrade | maximum | report only (deg C) (alert, not enforceable) | all year | IN1 |
| Temperature, water deg. centigrade | maximum | report only (deg C) (alert, not enforceable) | all year | IN1 |
| pH | maximum | report only (SU) (alert, not enforceable) | all year | IN1 |
| pH | maximum | report only (SU) (alert, not enforceable) | all year | IN1 |
| pH | minimum | report only (SU) (alert, not enforceable) | all year | IN1 |
| pH | minimum | report only (SU) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | 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 | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (MGD) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | single reading | report only (mg/L) (alert, not enforceable) | all year | IN1Q |
| BOD, 5-day, 20 deg. C | single reading | report only (mg/L) (alert, not enforceable) | all year | IN1Q |
| BOD, 5-day, 20 deg. C | single reading | report only (lb/d) (alert, not enforceable) | all year | IN1Q |
| BOD, 5-day, 20 deg. C | single reading | report only (lb/d) (alert, not enforceable) | all year | IN1Q |
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/WA0021113 · MCP: https://passage-data.com/mcp