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Sewage treatment plant, Metaline Falls, Washington. NPDES permit WA0991009 expired May 31, 2023; its limits 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 | maximum | 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 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 11.5 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 11.5 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 17.2 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 17.2 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Apr, May, Jun, Oct, Nov | 001 |
| pH | daily minimum | ≥ 6.5 SU | Apr, May, Jun, Oct, Nov | 001 |
| pH | maximum | report only (SU) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| pH | maximum | report only (SU) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| pH | daily maximum | ≤ 8.5 SU | Apr, May, Jun, Oct, Nov | 001 |
| pH | daily maximum | ≤ 8.5 SU | Apr, May, Jun, Oct, Nov | 001 |
| pH | minimum | report only (SU) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| pH | minimum | report only (SU) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Alkalinity, total [as CaCO3] | maximum | report only (mg/L) (alert, not enforceable) | May, Nov | 001 |
| Alkalinity, total [as CaCO3] | maximum | report only (mg/L) (alert, not enforceable) | May, Nov | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | monthly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | weekly average | report only (mg/L) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | monthly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 10.6 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | monthly average | ≤ 10.6 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | weekly average | report only (lb/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 15.9 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| Solids, total suspended | weekly average | ≤ 15.9 lb/d | Apr, May, Jun, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum | 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] | monthly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Hardness, total [as CaCO3] | maximum | report only (mg/L) (alert, not enforceable) | May, Nov | 001 |
| Hardness, total [as CaCO3] | maximum | report only (mg/L) (alert, not enforceable) | May, Nov | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 50 #/100mL | Apr, May, Jun, Oct, Nov | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | ≤ 50 #/100mL | Apr, May, Jun, Oct, Nov | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | monthly geometric mean | report only (#/100mL) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 100 #/100mL | Apr, May, Jun, Oct, Nov | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | ≤ 100 #/100mL | Apr, May, Jun, Oct, Nov | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | report only (#/100mL) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Fecal coliform, MPN, EC med, 44.5 C | weekly geometric mean | report only (#/100mL) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Chlorine, total residual | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| Chlorine, total residual | maximum | report only (mg/L) (alert, not enforceable) | all year | 001 |
| BOD, percent removal [total] | monthly average | report only (%) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, percent removal [total] | monthly average | report only (%) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | Apr, May, Jun, Oct, Nov | 001 |
| BOD, percent removal [total] | monthly average minimum | ≥ 85 % | Apr, May, Jun, Oct, Nov | 001 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | Apr, May, Jun, Oct, Nov | 001 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | Apr, May, Jun, Oct, Nov | 001 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, suspended percent removal | monthly average | report only (%) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, suspended percent removal | monthly average | report only (%) (alert, not enforceable) | Jan, Feb, Mar, Jul, Aug, Sep, Dec | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Apr, May, Jun, Oct, Nov | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | Apr, May, Jun, Oct, Nov | 001 |
| Rainfall duration | monthly total | report only (hr) (alert, not enforceable) | all year | 002 |
| Rainfall duration | monthly total | report only (hr) (alert, not enforceable) | all year | 002 |
| Duration of discharge | monthly total | report only (hr) (alert, not enforceable) | all year | 002 |
| Duration of discharge | monthly total | report only (hr) (alert, not enforceable) | all year | 002 |
| 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 | 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 |
| 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 | 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 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | maximum | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | monthly average | report only (gal/d) (alert, not enforceable) | all year | IN1 |
| Flow | annual average | report only (gal/d) (alert, not enforceable) | Dec | IN2 |
| Flow | annual average | report only (gal/d) (alert, not enforceable) | Dec | IN2 |
Cited limits by parameter: Washington's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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