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Federal facility (Sewerage Systems), Oak Harbor, Washington. NPDES permit WA0026760 expired Dec 26, 2023; its limits still apply. Last 12 months: no values over a limit, 2 required values missing, 1 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 214 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 309 lb/d | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | annual maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | annual maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | annual maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | annual maximum | report only (ug/L) | all year | 002 |
| Oil and grease | annual maximum | report only (mg/L) | all year | 002 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | 002 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 400 #/100mL | all year | 002 |
| Floating solids, waste or visible foam-visual | monthly maximum | ≤ 0 N=0;Y=1 | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 500 ug/L | all year | 002 |
| Chlorine, total residual | weekly average | ≤ 750 ug/L | all year | 002 |
| Chlorine, total residual | annual maximum | report only (ug/L) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 2.37 lb/d | all year | 002 |
| Chlorine, total residual | weekly average | ≤ 3.56 lb/d | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Solids, total dissolved | annual maximum | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 118 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 190 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | 002 |
| Tide stage | total | report only (ft) | all year | GW1 |
| pH | instantaneous minimum | report only (SU) | all year | GW1 |
| pH | instantaneous maximum | report only (SU) | all year | GW1 |
| Salinity | instantaneous maximum | report only (ppk) | all year | GW1 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | GW1 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | GW1 |
| Fecal coliform, MPN, EC med, 44.5 C | instantaneous maximum | report only (#/100mL) | all year | GW1 |
| Depth to water level ft below landsurface | total | report only (ft) | all year | GW1 |
| Tide stage | total | report only (ft) | all year | GW2 |
| pH | instantaneous minimum | report only (SU) | all year | GW2 |
| pH | instantaneous maximum | report only (SU) | all year | GW2 |
| Salinity | instantaneous maximum | report only (ppk) | all year | GW2 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | GW2 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | GW2 |
| Fecal coliform, MPN, EC med, 44.5 C | instantaneous maximum | report only (#/100mL) | all year | GW2 |
| Depth to water level ft below landsurface | total | report only (ft) | all year | GW2 |
| Tide stage | total | report only (ft) | all year | GW3 |
| pH | instantaneous minimum | report only (SU) | all year | GW3 |
| pH | instantaneous maximum | report only (SU) | all year | GW3 |
| Salinity | instantaneous maximum | report only (ppk) | all year | GW3 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | GW3 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | GW3 |
| Fecal coliform, MPN, EC med, 44.5 C | instantaneous maximum | report only (#/100mL) | all year | GW3 |
| Depth to water level ft below landsurface | total | report only (ft) | all year | GW3 |
| Tide stage | total | report only (ft) | all year | GW4 |
| pH | instantaneous minimum | report only (SU) | all year | GW4 |
| pH | instantaneous maximum | report only (SU) | all year | GW4 |
| Salinity | instantaneous maximum | report only (ppk) | all year | GW4 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | GW4 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | GW4 |
| Fecal coliform, MPN, EC med, 44.5 C | instantaneous maximum | report only (#/100mL) | all year | GW4 |
| Depth to water level ft below landsurface | total | report only (ft) | all year | GW4 |
| Tide stage | total | report only (ft) | all year | GW5 |
| pH | instantaneous minimum | report only (SU) | all year | GW5 |
| pH | instantaneous maximum | report only (SU) | all year | GW5 |
| Salinity | instantaneous maximum | report only (ppk) | all year | GW5 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | GW5 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | GW5 |
| Fecal coliform, MPN, EC med, 44.5 C | instantaneous maximum | report only (#/100mL) | all year | GW5 |
| Depth to water level ft below landsurface | total | report only (ft) | all year | GW5 |
Cited limits by parameter: Washington's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/WA0026760 · MCP: https://passage-data.com/mcp