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Sewage treatment plant, Carnation, Washington. NPDES permit WA0032182 expired Oct 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | ≤ 33 deg C | Jun–Sep | 001 |
| Oxygen, dissolved [DO] | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) (alert, not enforceable) | 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 | ≤ 120 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 180 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] | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | average | ≤ 4.1 lb/d | Aug–Oct | 001 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | maximum | 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 |
| Nitrogen, inorganic total | average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, inorganic total | weekly 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 |
| Phosphorus, dissolved reactive [drp as P] | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 741 ug/L | all year | 001 |
| E. coli | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | all year | 001 |
| E. coli | weekly geometric mean | report only (#/100mL) (alert, not enforceable) | all year | 001 |
| pH, maximum | daily maximum | ≤ 9 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 | weekly geometric mean | ≤ 400 #/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 |
| 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] | average | ≤ 20.1 lb/d | Aug–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 100 lb/d | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 160 lb/d | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Oxygen, dissolved [DO] | average | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Solids, total suspended | average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | average | ≤ 120 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 180 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | average | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrogen, ammonia total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrogen, ammonia total [as N] | average | ≤ 4.1 lb/d | Aug–Oct | 002 |
| Nitrogen, ammonia total [as N] | average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 002 |
| Nitrogen, Kjeldahl, total [as N] | average | ≤ 3 mg/L | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrite + Nitrate total [as N] | maximum | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Nitrogen, inorganic total | average | ≤ 14.8 mg/L | all year | 002 |
| Nitrogen, inorganic total | weekly average | ≤ 22.2 mg/L | all year | 002 |
| Phosphorus, total [as P] | average | ≤ 4.7 mg/L | all year | 002 |
| Phosphorus, total [as P] | maximum | report only (mg/L) (alert, not enforceable) | all year | 002 |
| Phosphorus, dissolved reactive [drp as P] | maximum | report only (mg/L) (alert, not enforceable) | all year | 002 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 002 |
| pH, minimum | daily minimum | ≥ 6 SU | all year | 002 |
| Coliform, total general | daily maximum | ≤ 23 #/100mL | all year | 002 |
| Flow | average | ≤ .321 MGD | all year | 002 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | 002 |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 17 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 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] | average | ≤ 20.1 lb/d | Aug–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | average | ≤ 100 lb/d | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 160 lb/d | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Carbonaceous oxygen demand, % removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 19 ug/L | all year | 002V |
| Turbidity | daily maximum | ≤ .5 NTU | all year | DPM |
| Turbidity | average | ≤ .2 NTU | all year | DPM |
| Ultraviolet light dosage | average | report only (mW-sec/cm2) (alert, not enforceable) | all year | DPM |
| Ultraviolet light dosage | minimum | report only (mW-sec/cm2) (alert, not enforceable) | all year | DPM |
| 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 | 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 |
| 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 | 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 |
| Flow | average | report only (MGD) (alert, not enforceable) | all year | INF |
| Flow | maximum | report only (MGD) (alert, not enforceable) | all year | INF |
| BOD, carbonaceous [5 day, 20 C] | average | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, carbonaceous [5 day, 20 C] | maximum | report only (mg/L) (alert, not enforceable) | all year | INF |
| BOD, carbonaceous [5 day, 20 C] | average | report only (lb/d) (alert, not enforceable) | all year | INF |
| BOD, carbonaceous [5 day, 20 C] | 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/WA0032182 · MCP: https://passage-data.com/mcp