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Sewage treatment plant, Cowiche, Washington. NPDES permit WA0052396 expired Mar 31, 2013; its limits still apply. Last 12 months: no values over a limit, 1 required value missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | ≤ 20.74 deg C | all year | 001 |
| Temperature, water deg. centigrade | monthly average | ≤ 20.74 deg C | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 2.88 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 2.88 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 8 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 8 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 73.4 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 73.4 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 110 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 110 lb/d | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Alkalinity, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 73.4 lb/d | all year | 001 |
| Solids, total suspended | monthly average | ≤ 73.4 lb/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 110 lb/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 110 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | single reading | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | single reading | report only (lb/d) (alert, not enforceable) | all year | 001 |
| Hardness, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Hardness, total [as CaCO3] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | single reading | report only (mg/L) | Sep, Oct | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 90 % | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 90 % | all year | 001 |
| SOPP | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| SOPP | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Thiabendazole | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Thiabendazole | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Coliform, fecal general | geometric mean | ≤ 50 #/100mL | all year | 001 |
| Coliform, fecal general | geometric mean | ≤ 50 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 100 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 100 #/100mL | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 001 |
| Flow | average | report only (MGD) (alert, not enforceable) | 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 |
| Solids, suspended percent removal | monthly average minimum | ≥ 90 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 90 % | all year | 001 |
| Redox [oxidation reduction potential] | maximum | report only (mv) (alert, not enforceable) | all year | IN1 |
| Redox [oxidation reduction potential] | maximum | report only (mv) (alert, not enforceable) | all year | IN1 |
| Conductivity | maximum | report only (umho/cm) (alert, not enforceable) | all year | IN1 |
| Conductivity | maximum | report only (umho/cm) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | average | 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 | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | average | 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] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Nitrogen, ammonia total [as N] | maximum | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | IN1 |
| Flow | average | report only (MGD) (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 |
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/WA0052396 · MCP: https://passage-data.com/mcp