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Sewage treatment plant, Cascade, Idaho. NPDES permit ID0023167 expired Feb 28, 2025; its limits still apply. Last 12 months: over a limit 2 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Solids, suspended percent removal, monthly average minimum | 68 % | ≥ 85 % | 113% |
| April 2026 | Solids, total suspended, weekly average | 67.98 mg/L | ≤ 45 mg/L | 51% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 | ≤ 180 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 270 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 | ≤ 180 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 270 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50.3 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 81.1 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 302.1 lb/d | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | 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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 180 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 270 lb/d | all year | 002 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 180 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 270 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.5 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50.3 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 81.1 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 302.1 lb/d | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 #/100mL | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| pH | instantaneous minimum | report only (SU) | all year | 101 |
| pH | instantaneous maximum | report only (SU) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 101 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 101 |
| E. coli, MTEC-MF | monthly geometric mean | report only (#/100mL) | all year | 101 |
| E. coli, MTEC-MF | daily maximum | report only (#/100mL) | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | maximum daily average | report only (MGD) | all year | 101 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | REC1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC1 |
| pH | instantaneous minimum | report only (SU) | all year | REC1 |
| pH | instantaneous maximum | report only (SU) | all year | REC1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | REC1 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | REC1 |
| E. coli, MTEC-MF | monthly geometric mean | report only (#/100mL) | all year | REC1 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | REC2 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC2 |
| E. coli, MTEC-MF | monthly geometric mean | report only (#/100mL) | all year | REC2 |
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/ID0023167 · MCP: https://passage-data.com/mcp