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Sewage treatment plant, major discharger, Des Moines, Washington. NPDES permit WA0020958 expired Nov 30, 2020; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 2252 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 2252 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 3378 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 3378 lb/d | all year | 001 |
| Solids, total suspended | average | ≤ 30 mg/L | 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 | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | average | ≤ 2252 lb/d | all year | 001 |
| Solids, total suspended | average | ≤ 2252 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 3378 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 3378 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, dissolved reactive [drp as P] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, dissolved reactive [drp as P] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | average | ≤ 360 ug/L | all year | 001 |
| Chlorine, total residual | average | ≤ 360 ug/L | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 001 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 001 |
| pH, minimum | daily minimum | ≥ 6 SU | all year | 001 |
| pH, minimum | daily minimum | ≥ 6 SU | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 400 #/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 | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | BPB |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | BPB |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | BPB |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | BPB |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | BPB |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | BPB |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | BPB |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | BPB |
| Rainfall | total | report only (in) (alert, not enforceable) | all year | BPB |
| Rainfall | total | report only (in) (alert, not enforceable) | all year | BPB |
| Duration | total | report only (hr) (alert, not enforceable) | all year | BPB |
| Duration | total | report only (hr) (alert, not enforceable) | all year | BPB |
| Chlorine, total residual | maximum | report only (ug/L) (alert, not enforceable) | all year | BPB |
| Chlorine, total residual | maximum | report only (ug/L) (alert, not enforceable) | all year | BPB |
| Volume, total | total | report only (Mgal) (alert, not enforceable) | all year | BPB |
| Volume, total | total | report only (Mgal) (alert, not enforceable) | all year | BPB |
| pH, maximum | maximum | report only (SU) (alert, not enforceable) | all year | BPB |
| pH, maximum | maximum | report only (SU) (alert, not enforceable) | all year | BPB |
| pH, minimum | minimum | report only (SU) (alert, not enforceable) | all year | BPB |
| pH, minimum | minimum | report only (SU) (alert, not enforceable) | all year | BPB |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | all year | BPB |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | all year | BPB |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | BPB |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | BPB |
| 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 |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | IN1 |
| Solids, total suspended | average | 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 | 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/WA0020958 · MCP: https://passage-data.com/mcp