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Sewage treatment plant, major discharger, Idaho Falls, Idaho. NPDES permit ID0021261 expired Oct 31, 2017; its limits still apply. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | daily maximum | 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 | ≤ 4250 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 6380 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 |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | 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 | ≤ 4250 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 6380 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.8 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.4 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.1 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.3 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 539 lb/d | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 482 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1999 lb/d | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1744 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 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 |
| 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 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 391 lb/d | all year | 001 |
| Phosphorus, total [as P] | annual average | ≤ 236 lb/d | Dec | 001 |
| Phosphorus, total [as P] | weekly average | ≤ 586 lb/d | all year | 001 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Chromium, total [as Cr] | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Silver total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| Oil and grease | monthly average | report only (mg/L) | all year | 001 |
| Oil and grease | daily maximum | report only (mg/L) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (ug/L) | all year | 001 |
| Phosphate, ortho [as P] | daily maximum | report only (ug/L) | 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 | monthly average | ≤ 90 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 200 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 12.8 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 28.4 lb/d | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | instantaneous maximum | ≤ 406 #/100mL | all year | 001 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | monthly average | report only (ug/L) | Jun, Dec | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | Jun, Dec | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Toxicity, Chronic | monthly average | report only (tox chronic) | Jun, Dec | 001 |
| Toxicity, Chronic | monthly average | report only (tox chronic) | May, Dec | 001 |
| Toxicity, Chronic | daily maximum | report only (tox chronic) | Jun, Dec | 001 |
| Toxicity, Chronic | daily maximum | report only (tox chronic) | May, Dec | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | REC |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | REC |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC |
| Oxygen, dissolved [DO] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Oxygen, dissolved [DO] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| pH | instantaneous minimum | report only (SU) | all year | REC |
| pH | instantaneous maximum | report only (SU) | 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] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Alkalinity, total [as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, ammonia total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, ammonia total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, nitrite total [as N] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, nitrite total [as N] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, nitrate total [as N] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, nitrate total [as N] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Phosphorus, total [as P] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Phosphorus, total [as P] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Hardness, total [as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Hardness, total [as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | REC |
| Copper, dissolved [as Cu] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Copper, dissolved [as Cu] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Phosphate, ortho [as P] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Phosphate, ortho [as P] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Mercury, total recoverable | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
| Mercury, total recoverable | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | REC |
Cited limits by parameter: Idaho's rules and the federal ones.
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