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Sewage treatment plant, Mount Shasta, California. NPDES permit CA0078051, in force until May 31, 2028. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Zinc, total recoverable, monthly average | 37.9 ug/L | ≤ 26 ug/L | 46% |
| February 2026 | Zinc, total recoverable, daily maximum | 61.3 ug/L | ≤ 46 ug/L | 33% |
| February 2026 | Zinc, total recoverable, monthly average | 61.3 ug/L | ≤ 26 ug/L | 136% |
| March 2026 | Copper, total recoverable, monthly average | 13.6 ug/L | ≤ 10 ug/L | 36% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 001 |
| Turbidity | instantaneous maximum | report only (NTU) | all year | 001 |
| Specific conductance | daily maximum | report only (umho/cm) | 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 | ≤ 15 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.7 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 8.9 mg/L | all year | 001 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 22 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | 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] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Potassium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Potassium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 26 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 46 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 10 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 18 ug/L | all year | 001 |
| Manganese, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total recoverable | daily maximum | report only (mg/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 |
| Bicarbonate as [CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Bicarbonate as [CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Carbonate ion [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Carbonate ion [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Hydroxide | daily maximum | report only (mg/L) | all year | 001 |
| Hydroxide | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | 001 |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | 001 |
| Coliform, total general | instantaneous maximum | ≤ 240 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 | median | ≤ 25 % effect | all year | 001 |
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | median | ≤ 25 % effect | all year | 001 |
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | daily maximum | report only (% effect) | all year | 001 |
| %Effect Static 4 Day Chronic Raphidocelis subcapitata | daily maximum | report only (% effect) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (% effect) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (% effect) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | median | ≤ 25 % effect | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (% effect) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (% effect) | all year | 001 |
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | minimum | ≥ 70 % survival | all year | 001 |
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | minimum median | ≥ 90 % survival | all year | 001 |
| % Survival Flow Through 96Hr Acute Oncorhynchus mykiss | minimum | ≥ 70 % survival | all year | 001 |
| % Survival Flow Through 96Hr Acute Oncorhynchus mykiss | minimum median | ≥ 90 % survival | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | median | ≤ 2 tox chronic | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | median | ≤ 2 tox chronic | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | median | ≤ 2 tox chronic | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | median | ≤ 2 tox chronic | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | median | ≤ 2 tox chronic | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | median | ≤ 2 tox chronic | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | daily maximum | report only (tox chronic) | 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 |
| pH | minimum | report only (SU) | all year | INF |
| pH | maximum | report only (SU) | 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/CA0078051 · MCP: https://passage-data.com/mcp