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Sewage treatment plant, major discharger, Pocatello, Idaho. NPDES permit ID0021784 expired Aug 31, 2017; its limits still apply. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 1693.4 lb/d | ≤ 1300 lb/d | 30% |
| July 2026 | Nitrogen, ammonia total [as N], daily maximum | 28.8 mg/L | ≤ 13 mg/L | 122% |
| July 2026 | Phosphorus, total [as P], monthly average | 49.9 lb/d | ≤ 25.1 lb/d | 99% |
| July 2026 | Phosphorus, total [as P], weekly average | 231.6 lb/d | ≤ 58.7 lb/d | 295% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year |
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 3000 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 4500 lb/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year |
| pH | instantaneous minimum | ≥ 6.5 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Alkalinity, total [as CaCO3] | monthly maximum | report only (mg/L) | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 3000 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 4500 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.3 mg/L | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jul–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.4 mg/L | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Jul–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 630 lb/d | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 500 lb/d | Jul–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1640 lb/d | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1300 lb/d | Jul–Oct |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | ≤ 25.1 lb/d | all year |
| Phosphorus, total [as P] | weekly average | ≤ 58.7 lb/d | all year |
| Cyanide, total [as CN] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Cyanide, total [as CN] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | Apr, Oct |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | Apr, Oct |
| Arsenic, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Arsenic, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Selenium, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Selenium, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Chromium, dissolved [as Cr] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Chromium, dissolved [as Cr] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Nickel, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Nickel, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Silver total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Silver total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Zinc, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Zinc, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Cadmium, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Cadmium, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Lead, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Lead, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Copper, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Copper, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Molybdenum, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Molybdenum, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Chromium, hexavalent dissolved [as Cr] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Chromium, hexavalent dissolved [as Cr] | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Oil and grease | annual maximum | report only (mg/L) | Apr, Oct |
| Phosphate, ortho [as P] | monthly average | report only (ug/L) | all year |
| Phosphate, ortho [as P] | monthly maximum | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year |
| Chlorine, total residual | monthly average | ≤ 50 ug/L | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ 50 ug/L | Jul–Oct |
| Chlorine, total residual | daily maximum | ≤ 50 ug/L | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ 50 ug/L | Jul–Oct |
| Chlorine, total residual | monthly average | ≤ 5 lb/d | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Chlorine, total residual | monthly average | ≤ 5 lb/d | Jul–Oct |
| Chlorine, total residual | daily maximum | ≤ 5 lb/d | Jan, Feb, Mar, Apr, May, Jun, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ 5 lb/d | Jul–Oct |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | all year |
| E. coli | instantaneous maximum | ≤ 576 MPN/100mL | all year |
| Toxicity [chronic], Ceriodaphnia dubia | annual maximum | report only (tox chronic) | May, Nov |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | annual maximum | report only (tox chronic) | May, Nov |
| Solids, total dissolved | monthly average | report only (mg/L) | all year |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year |
| Mercury, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| Mercury, total recoverable | semi-annual maximum | report only (ug/L) | Apr, Oct |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
Cited limits by parameter: Idaho'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/ID0021784 · MCP: https://passage-data.com/mcp