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Sewage treatment plant, Shoshone, Idaho. NPDES permit ID0023728 expired Apr 30, 2024; its limits still apply. Last 12 months: over a limit 3 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, 5-day, 20 deg. C, monthly average | 36.8 mg/L | ≤ 30 mg/L | 23% |
| October 2025 | BOD, 5-day, 20 deg. C, weekly average | 50 mg/L | ≤ 45 mg/L | 11% |
| November 2025 | Solids, total suspended, weekly average | 49 mg/L | ≤ 45 mg/L | 9% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | 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 | ≤ 130 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 200 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average minimum | ≥ 85 % | 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 | ≤ 130 lb/d | all year | 001 |
| Solids, total suspended | annual average | ≤ 75.2 lb/d | Dec | 001 |
| Solids, total suspended | weekly average | ≤ 200 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average minimum | ≥ 85 % | 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 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 11 lb/d | all year | 001 |
| Phosphorus, total [as P] | annual average | ≤ 6.12 lb/d | Dec | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli, MTEC-MF | instantaneous maximum | report only (#/100mL) | all year | 001 |
| Floating solids, waste or visible foam-visual | quarterly 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 | monthly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .05 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .13 mg/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .09 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .22 lb/d | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | RWD |
| pH | instantaneous minimum | report only (SU) | all year | RWD |
| pH | instantaneous maximum | report only (SU) | all year | RWD |
| Alkalinity, total [as CaCO3] | monthly average | report only (mg/L) | all year | RWD |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | RWD |
| Calcium, dissolved [as Ca] | monthly average | report only (mg/L) | all year | RWD |
| Magnesium, dissolved [as Mg] | monthly average | report only (mg/L) | all year | RWD |
| Sodium, dissolved [as Na] | monthly average | report only (mg/L) | all year | RWD |
| Potassium, dissolved [as K] | monthly average | report only (mg/L) | all year | RWD |
| Copper, dissolved [as Cu] | monthly average | report only (ug/L) | all year | RWD |
| Chloride | monthly average | report only (mg/L) | all year | RWD |
| Sulfate | monthly average | report only (mg/L) | all year | RWD |
| Temperature, water deg. centigrade | maximum daily average | report only (deg C) | all year | RWU |
| Streamflow | instantaneous minimum | report only (cfs) | all year | RWU |
| Streamflow | instantaneous maximum | report only (cfs) | all year | RWU |
| pH | instantaneous minimum | report only (SU) | all year | RWU |
| pH | instantaneous maximum | report only (SU) | all year | RWU |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | RWU |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | RWU |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | RWU |
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/ID0023728 · MCP: https://passage-data.com/mcp