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Sewage treatment plant, major discharger, Boise, Idaho. NPDES permit ID0020443, in force until Jun 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3 mg/L | Oct | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 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 | ≤ 3753 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 5630 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 | weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | 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 | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Apr–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Apr–Sep | 001 |
| Solids, total suspended | monthly average | ≤ 2500 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 3400 lb/d | Apr–Sep | 001 |
| Solids, total suspended | weekly average | ≤ 3750 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 5000 lb/d | Apr–Sep | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (ug/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (ug/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (ug/L) | all year | 001 |
| Phosphorus, total [as P] | daily 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] | annual average | report only (lb/d) | all year | 001 |
| Cyanide, weak acid, dissociable | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 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 recoverable | monthly average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | monthly average | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Silver total recoverable | monthly average | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Silver total recoverable | daily maximum | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Apr, Jun, Sep, Dec | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Phosphorus, total [as P] [per season] | annual average | report only (lb/season) | Dec | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 15 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | 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 |
| E. coli | monthly geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | instantaneous maximum | ≤ 406 #/100mL | all year | 001 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | semi-annual 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 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (Ratio) | Apr, Dec | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (Ratio) | Jun, Sep | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (Ratio) | Apr, Dec | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (Ratio) | Jun, Sep | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average | report only (Ratio) | Jun, Sep | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average | report only (Ratio) | Apr, Dec | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily maximum | report only (Ratio) | Jun, Sep | 001 |
| IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily maximum | report only (Ratio) | Apr, Dec | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (Ratio) | Apr, Dec | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (Ratio) | Jun, Sep | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (Ratio) | Apr, Dec | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (Ratio) | Jun, Sep | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average | report only (Ratio) | Jun, Sep | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | monthly average | report only (Ratio) | Apr, Dec | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily maximum | report only (Ratio) | Jun, Sep | 001 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | daily maximum | report only (Ratio) | Apr, Dec | 001 |
| Toxicity, Chronic | monthly average | ≤ 4 toxic | Jun, Sep | 001 |
| Toxicity, Chronic | monthly average | ≤ 2.6 toxic | Apr, Dec | 001 |
| Toxicity, Chronic | daily maximum | ≤ 11.6 toxic | Jun, Sep | 001 |
| Toxicity, Chronic | daily maximum | ≤ 5.3 toxic | Apr, Dec | 001 |
| Static 96Hr Chronic Selen. Capricornutum | monthly average | report only (toxic) | Jun, Sep | 001 |
| Static 96Hr Chronic Selen. Capricornutum | monthly average | report only (toxic) | Apr, Dec | 001 |
| Static 96Hr Chronic Selen. Capricornutum | daily maximum | report only (toxic) | Jun, Sep | 001 |
| Static 96Hr Chronic Selen. Capricornutum | daily maximum | report only (toxic) | Apr, Dec | 001 |
| Temperature, water deg. centigrade | maximum daily average | report only (deg C) | all year | REC1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | REC1 |
| Turbidity | annual maximum | report only (NTU) | Apr, Jun, Sep, Dec | REC1 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | REC1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | REC1 |
| pH | daily maximum | report only (SU) | all year | REC1 |
| pH | instantaneous minimum | report only (SU) | all year | REC1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | REC1 |
| Oil & Grease | annual maximum | report only (mg/L) | Apr, Jun, Sep, Dec | REC1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (ug/L) | all year | REC1 |
| Nitrite + Nitrate total [as N] | annual maximum | report only (mg/L) | Apr, Jun, Sep, Dec | REC1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | REC1 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | REC1 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | REC1 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | REC1 |
| Selenium, total recoverable | quarterly maximum | report only (ug/L) | Apr, Jun, Sep, Dec | REC1 |
| Cadmium, dissolved [as Cd] | daily maximum | report only (ug/L) | all year | REC1 |
| Chromium, dissolved [as Cr] | quarterly maximum | report only (ug/L) | Apr, Jun, Sep, Dec | REC1 |
| Copper, dissolved [as Cu] | daily maximum | report only (ug/L) | all year | REC1 |
| Lead, dissolved [as Pb] | daily maximum | report only (ug/L) | all year | REC1 |
| Nickel, dissolved [as Ni] | quarterly maximum | report only (ug/L) | Apr, Jun, Sep, Dec | REC1 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | REC1 |
| Zinc, dissolved [as Zn] | daily maximum | report only (ug/L) | all year | REC1 |
| E. coli | daily maximum | report only (#/100mL) | all year | REC1 |
| Nitrogen, Kjeldahl Total | annual maximum | report only (mg/L) | Apr, Jun, Sep, Dec | REC1 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | REC1 |
| Temperature, water deg. centigrade | maximum daily average | report only (deg C) | all year | REC2 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | REC2 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | all year | REC2 |
| pH | instantaneous maximum | report only (SU) | all year | REC2 |
| pH | instantaneous minimum | report only (SU) | all year | REC2 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | REC2 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | REC2 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | REC2 |
| Copper, dissolved [as Cu] | monthly average | report only (ug/L) | all year | REC2 |
| Copper, dissolved [as Cu] | daily maximum | report only (ug/L) | all year | REC2 |
| Zinc, dissolved [as Zn] | daily maximum | report only (ug/L) | all year | REC2 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | REC2 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | REC2 |
| Phosphorus, total [as P] | annual average | ≤ 405 lb/d | Dec | SUM |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Phosphorus, total [as P], annual average | 275 lb/d (Dec) | tighter | — | — |
Cited limits by parameter: Idaho's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/ID0020443 · MCP: https://passage-data.com/mcp