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Sewage treatment plant, Dunsmuir, California. NPDES permit CA0078441, in force until Mar 31, 2029. Last 12 months: over a limit 2 times (last December 2025), 13 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, weekly average | 21 mg/L | ≤ 15 mg/L | 40% |
| December 2025 | Zinc, total recoverable, monthly average | 70.5 ug/L | ≤ 65 ug/L | 8% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | EFF1 |
| Turbidity | daily maximum | report only (NTU) | all year | EFF1 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | EFF1 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | EFF1 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | EFF1 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | EFF1 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | EFF1 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF1 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | EFF1 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 mg/L | all year | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 44 mg/L | all year | EFF1 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | EFF1 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | EFF1 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 18 mg/L | all year | EFF1 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 39 mg/L | all year | EFF1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | EFF1 |
| Carbon, dissolved organic [as C] | daily maximum | report only (ug/L) | all year | EFF1 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF1 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Potassium, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | EFF1 |
| Iron, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Zinc, total recoverable | monthly average | ≤ 65 ug/L | all year | EFF1 |
| Zinc, total recoverable | daily maximum | ≤ 100 ug/L | all year | EFF1 |
| Copper, total recoverable | monthly average | ≤ 18 ug/L | all year | EFF1 |
| Copper, total recoverable | daily maximum | ≤ 32 ug/L | all year | EFF1 |
| Manganese, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Dichlorobromomethane | monthly average | ≤ 17 ug/L | all year | EFF1 |
| Dichlorobromomethane | daily maximum | ≤ 43 ug/L | all year | EFF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | EFF1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | EFF1 |
| Chlorine, total residual | 4-day average | ≤ .011 mg/L | all year | EFF1 |
| Chlorine, total residual | 1-hour average | ≤ .019 mg/L | all year | EFF1 |
| Coliform, total general | instantaneous maximum | ≤ 240 MPN/100mL | all year | EFF1 |
| Coliform, total general | 7-day median | ≤ 2.2 MPN/100mL | all year | EFF1 |
| Coliform, total general | 30-day maximum | ≤ 23 MPN/100mL | all year | EFF1 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | EFF1 |
| %Effect Statre 4Day Chronic Selen. Capr. | daily maximum | ≤ 50 % effect | all year | EFF1 |
| Pass/Fail Static 96Hr Chronic Selen. Capricornutum | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Pass/Fail Static 96Hr Chronic Selen. Capricornutum | monthly median | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr O mykiss | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr O mykiss | monthly median | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Acute Mthd Survival Endpt, %Effect, Median TSTaHo R/nR Pass/Fail, StatR96hr O mykiss | daily maximum | ≤ 50 % effect | all year | EFF1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF1 |
| pH | instantaneous minimum | report only (SU) | all year | INF1 |
| pH | instantaneous maximum | report only (SU) | all year | INF1 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF1 |
Cited limits by parameter: California's rules and the federal ones.
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