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Sewage treatment plant, Alturas, California. NPDES permit CA0078921 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 23 times (last August 2026), 3 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Aluminum, total recoverable, monthly average | 869 ug/L | ≤ 290 ug/L | 200% |
| October 2025 | Aluminum, total recoverable, weekly average | 869 ug/L | ≤ 370 ug/L | 135% |
| October 2025 | BOD, 5-day, 20 deg. C, monthly average | 40 mg/L | ≤ 30 mg/L | 33% |
| October 2025 | Copper, total recoverable, monthly average | 6.96 ug/L | ≤ 6.7 ug/L | 4% |
| November 2025 | Aluminum, total recoverable, monthly average | 1030 ug/L | ≤ 290 ug/L | 255% |
| November 2025 | Aluminum, total recoverable, weekly average | 1030 ug/L | ≤ 370 ug/L | 178% |
| November 2025 | BOD, 5-day, percent removal, monthly average minimum | 75 % | ≥ 85 % | 67% |
| November 2025 | Solids, suspended percent removal, monthly average minimum | 69 % | ≥ 85 % | 107% |
| December 2025 | %Effect Static Renewal 7Day Chronic Pimephales promelas, monthly median | 75 % effect | ≤ 25 % effect | 200% |
| December 2025 | Aluminum, total recoverable, monthly average | 974 ug/L | ≤ 290 ug/L | 236% |
| December 2025 | Aluminum, total recoverable, weekly average | 974 ug/L | ≤ 370 ug/L | 163% |
| December 2025 | Solids, total suspended, monthly average | 37.4 mg/L | ≤ 30 mg/L | 25% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 30.8 mg/L | ≤ 30 mg/L | 3% |
| April 2026 | Copper, total recoverable, daily maximum | 17.7 ug/L | ≤ 15 ug/L | 18% |
| April 2026 | Copper, total recoverable, monthly average | 17.7 ug/L | ≤ 6.7 ug/L | 164% |
| May 2026 | Aluminum, total recoverable, monthly average | 1020 ug/L | ≤ 290 ug/L | 252% |
| May 2026 | Aluminum, total recoverable, weekly average | 1020 ug/L | ≤ 370 ug/L | 176% |
| June 2026 | Aluminum, total recoverable, monthly average | 849 ug/L | ≤ 290 ug/L | 193% |
| June 2026 | Aluminum, total recoverable, weekly average | 849 ug/L | ≤ 370 ug/L | 129% |
| July 2026 | Aluminum, total recoverable, monthly average | 1000 ug/L | ≤ 290 ug/L | 245% |
| July 2026 | Aluminum, total recoverable, weekly average | 1000 ug/L | ≤ 370 ug/L | 170% |
| August 2026 | Aluminum, total recoverable, monthly average | 1300 ug/L | ≤ 290 ug/L | 348% |
| August 2026 | Aluminum, total recoverable, weekly average | 1300 ug/L | ≤ 370 ug/L | 251% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | 001 |
| Turbidity | monthly average | report only (NTU) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | all year | 001 |
| Specific conductance | monthly average | report only (umho/cm) | all year | 001 |
| Specific conductance | annual average | ≤ 1030 umho/cm | all year | 001 |
| Specific conductance | annual average | ≤ 1030 umho/cm | all year | 001 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 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 | weekly average | ≤ 15 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 37 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 155 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 220 lb/d | all year | 001 |
| Nitrogen, nitrite total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 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 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | 001 |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/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 | ≤ 18 ug/L | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ 22 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 26 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 40 ug/L | all year | 001 |
| Aluminum, total recoverable | monthly average | ≤ 290 ug/L | all year | 001 |
| Aluminum, total recoverable | monthly average | ≤ 2500 ug/L | all year | 001 |
| Aluminum, total recoverable | weekly average | ≤ 370 ug/L | all year | 001 |
| Aluminum, total recoverable | weekly average | ≤ 4600 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 6.7 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 15 ug/L | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | monthly average | ≤ 10.6 ug/L | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | ≤ 16.6 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 | 4-day average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | 1-hour average | ≤ .019 mg/L | all year | 001 |
| Nitrite Plus Nitrate Total | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrite Plus Nitrate Total | weekly average | ≤ 15 mg/L | all year | 001 |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | 001 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | 30-day maximum | ≤ 240 MPN/100mL | all year | 001 |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | 001 |
| Coliform, total general | daily maximum | ≤ 500 MPN/100mL | 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 |
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | monthly median | ≤ 25 % effect | all year | 001 |
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | monthly median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly median | ≤ 25 % effect | all year | 001 |
| % Survival Static Renewal 96Hr Acute Pimephales promelas | minimum | ≥ 70 % survival | all year | 001 |
| % Survival Static Renewal 96Hr Acute Pimephales promelas | minimum median | ≥ 90 % survival | all year | 001 |
| % Survival Flow Through 96Hr Acute Pimephales promelas | minimum | ≥ 70 % survival | all year | 001 |
| % Survival Flow Through 96Hr Acute Pimephales promelas | minimum median | ≥ 90 % survival | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | ≤ 16 toxic | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | ≤ 16 toxic | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | ≤ 16 toxic | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | ≤ 16 toxic | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | ≤ 16 toxic | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | ≤ 16 toxic | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
Cited limits by parameter: California'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/CA0078921 · MCP: https://passage-data.com/mcp