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Sewage treatment plant, major discharger, Lewiston, Idaho. NPDES permit ID0022055 expired Jan 31, 2021; 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 weekly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Conductivity | instantaneous maximum | report only (umho/cm) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Conductivity | instantaneous maximum | report only (umho/cm) | Jul–Sep | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly 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 | monthly average | ≤ 1430 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 2145 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1430 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 2145 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | annual maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | annual maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | report only (ug/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Carbon, dissolved organic [as C] | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Carbon, dissolved organic [as C] | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Cyanide, weak acid, dissociable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Cyanide, weak acid, dissociable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Hardness, total [as CaCO3] | instantaneous minimum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Hardness, total [as CaCO3] | instantaneous minimum | report only (mg/L) | Jul–Sep | 001 |
| Hardness, total [as CaCO3] | instantaneous maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Hardness, total [as CaCO3] | instantaneous maximum | report only (mg/L) | Jul–Sep | 001 |
| Arsenic, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Arsenic, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Selenium, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Selenium, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Nickel, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Nickel, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Silver total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Silver total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Zinc, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Zinc, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Lead, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Lead, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Copper, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Copper, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Oil and grease | annual maximum | report only (mg/L) | all year | 001 |
| Chromium, trivalent total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Chromium, trivalent total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 CFU/100mL | all year | 001 |
| E. coli, MTEC-MF | instantaneous maximum | ≤ 406 CFU/100mL | all year | 001 |
| Floating solids, waste or visible foam-visual | monthly maximum | ≤ 0 N=0;Y=1 | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | annual maximum | report only (ug/L) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 340 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 700 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 14.29 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 33.33 lb/d | all year | 001 |
| Solids, total dissolved | annual maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Mercury, total recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| Chromium, hexavalent tot recoverable | instantaneous maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 001 |
| Chromium, hexavalent tot recoverable | instantaneous maximum | report only (ug/L) | Jul–Sep | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | REC |
| pH | instantaneous minimum | report only (SU) | all year | REC |
| pH | instantaneous maximum | report only (SU) | all year | REC |
| Alkalinity, total [as CaCO3] | instantaneous minimum | report only (mg/L) | all year | REC |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | REC |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | REC |
| Nitrogen, Kjeldahl, total [as N] | instantaneous maximum | report only (mg/L) | all year | REC |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | REC |
| Phosphate, ortho [as PO4] | instantaneous maximum | report only (mg/L) | all year | REC |
| Phosphorus, total [as P] | instantaneous maximum | report only (mg/L) | all year | REC |
| Hardness, total [as CaCO3] | instantaneous minimum | report only (mg/L) | all year | REC |
| Hardness, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | REC |
Cited limits by parameter: Idaho's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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