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Sewage treatment plant, Shelton, Washington. NPDES permit WA0038377 expired Dec 31, 2022; its limits still apply. Last 12 months: over a limit 3 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Solids, suspended percent removal, monthly average minimum | 78 | ≥ 85 % | 47% |
| March 2026 | Solids, suspended percent removal, monthly average minimum | 74 | ≥ 85 % | 73% |
| March 2026 | Solids, total suspended, weekly average | 49 | ≤ 45 mg/L | 9% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | average | report only (deg C) (alert, not enforceable) | Jul, Dec | 001 |
| Temperature, water deg. centigrade | average | report only (deg C) (alert, not enforceable) | Jul, Dec | 001 |
| Oxygen, dissolved [DO] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | annual average | 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 | 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 | ≤ 41 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | average | ≤ 41 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 62 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 62 lb/d | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 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 | 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 | ≤ 41 lb/d | all year | 001 |
| Solids, total suspended | average | ≤ 41 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 62 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 62 lb/d | all year | 001 |
| Oil & Grease | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oil & Grease | annual 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, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 001 |
| Chlorine, total residual | average | ≤ .5 mg/L | all year | 001 |
| Chlorine, total residual | average | ≤ .5 mg/L | all year | 001 |
| Chlorine, total residual | weekly average | ≤ .75 mg/L | all year | 001 |
| Chlorine, total residual | weekly average | ≤ .75 mg/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 |
| Solids, total dissolved | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total dissolved | annual average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Flow | average | report only (gal/d) (alert, not enforceable) | all year | 001 |
| Flow | average | report only (gal/d) (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 | INF |
| BOD, 5-day, 20 deg. C | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | maximum | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | INF |
| BOD, 5-day, 20 deg. C | maximum | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | maximum | report only (mg/L) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | INF |
| Solids, total suspended | maximum | report only (lb/d) (alert, not enforceable) | all year | INF |
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/WA0038377 · MCP: https://passage-data.com/mcp