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Sewerage Systems, Stanwood, Washington. NPDES permit WA0029904 expired Mar 31, 2026; its terms still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | average | 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 |
| Flow rate | average | report only (gal/min) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | maximum | report only (mg/L) (alert, not enforceable) | 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 | average | ≤ 38 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 56 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 | ≤ 38 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 56 lb/d | all year | 001 |
| Oil and grease, hexane extr method | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oil and grease, hexane extr method | maximum | 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, ammonia total [as N] | maximum | 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] | maximum | 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] | maximum | 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] | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | average | ≤ 33 ug/L | all year | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, total dissolved | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total dissolved | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 72 #/100mL | all year | 001 |
| Coliform, fecal general | weekly geometric mean | ≤ 285 #/100mL | 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 |
| 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 | 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 | 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 | 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 | maximum | report only (lb/d) (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 |
| Oxygen, dissolved [DO] | maximum | report only (mg/L) (alert, not enforceable) | all year | RST |
| BOD, 5-day, 20 deg. C | average | ≤ 30 mg/L | all year | RST |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | RST |
| pH | daily minimum | ≥ 6 SU | all year | RST |
| pH | daily maximum | ≤ 9 SU | all year | RST |
| Solids, total suspended | average | ≤ 30 mg/L | all year | RST |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | RST |
| Chlorine, total residual | average | report only (mg/L) (alert, not enforceable) | all year | RST |
| Chlorine, total residual | maximum | report only (mg/L) (alert, not enforceable) | all year | RST |
| Coliform, total general | 7-day median | ≤ 23 #/100mL | all year | RST |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | RST |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | RST |
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/WA0029904 · MCP: https://passage-data.com/mcp