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Sewage treatment plant, major discharger, Edmonds, Washington. NPDES permit WA0024031 expired Feb 29, 2024; its limits still apply. Last 12 months: no values over a limit, 6 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily minimum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Temperature, water deg. centigrade | daily minimum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | single reading | report only (mg/L) (alert, not enforceable) | 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 | ≤ 1851 lb/d | all year | 001 |
| Solids, total suspended | average | ≤ 1851 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 2777 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 2777 lb/d | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrite + Nitrate total [as N] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, total [as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, dissolved reactive [drp as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Phosphorus, dissolved reactive [drp as P] | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Cyanide, total [as CN] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Cyanide, total [as CN] | single reading | report only (ug/L) (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 |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Total phenols | single reading | report only (ug/L) | all year | 001 |
| Phenolics, total | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Phenolics, total | single reading | report only (ug/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | average | ≤ 278 ug/L | all year | 001 |
| Chlorine, total residual | average | ≤ 278 ug/L | 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 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Solids, total dissolved | single reading | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | 001 |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | 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 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 1543 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 1543 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 2469 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 2469 lb/d | 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 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 001 |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | 001B |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | 001B |
| Cyanide, total [as CN] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Cyanide, total [as CN] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Beryllium, total [as Be] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Beryllium, total [as Be] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Cadmium, total [as Cd] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Cadmium, total [as Cd] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Chromium, total [as Cr] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Chromium, total [as Cr] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Lead, total dry weight [as Pb] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Lead, total dry weight [as Pb] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Thallium, total [as Tl] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Thallium, total [as Tl] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Nickel, total [as Ni] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Nickel, total [as Ni] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Silver, total [as Ag] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Silver, total [as Ag] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Zinc in bottom deposits [dry wgt] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Zinc in bottom deposits [dry wgt] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Antimony, total [as Sb] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Antimony, total [as Sb] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Selenium, total [as Se] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Selenium, total [as Se] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Total phenols | single reading | report only (mg/kg) | all year | 001B |
| Phenolics, total | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Phenolics, total | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Arsenic total, dry weight, sludge | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Arsenic total, dry weight, sludge | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Mercury, tot in bot deposits [dry wgt] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Mercury, tot in bot deposits [dry wgt] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Copper, sludge, total, dry weight [as Cu] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| Copper, sludge, total, dry weight [as Cu] | single reading | report only (mg/kg) (alert, not enforceable) | all year | 001B |
| 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 |
| pH | single reading | report only (SU) (alert, not enforceable) | all year | IN1 |
| pH | single reading | report only (SU) (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 |
| Oil and grease [soxhlet extr.] tot. | single reading | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Oil and grease [soxhlet extr.] tot. | single reading | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| Cyanide, total [as CN] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Cyanide, total [as CN] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Arsenic, total [as As] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Beryllium, total [as Be] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Cadmium, total [as Cd] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Chromium, total [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Copper, total [as Cu] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Lead, total [as Pb] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Thallium, total [as Tl] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Nickel, total [as Ni] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Silver, total [as Ag] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Zinc, total [as Zn] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Antimony, total [as Sb] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Selenium, total [as Se] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Chromium, hexavalent dissolved [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Chromium, hexavalent dissolved [as Cr] | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Total phenols | single reading | report only (ug/L) | all year | IN1 |
| Phenolics, total | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Phenolics, total | single reading | report only (ug/L) (alert, not enforceable) | all year | IN1 |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | IN1 |
| Mercury, total [as Hg] | single reading | report only (ng/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | average | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (mg/L) (alert, not enforceable) | all year | IN1 |
Cited limits by parameter: Washington's rules and the federal ones.
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