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Sewage treatment plant, Cottonwood, California. NPDES permit CA0081507, in force until May 31, 2029. Last 12 months: over a limit 4 times (last August 2026), 5 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Chlorine, total residual, 1-hour average | 2.5 mg/L | ≤ .019 mg/L | 13058% |
| April 2026 | Chlorine, total residual, 4-day average | 10.1 mg/L | ≤ .011 mg/L | 91718% |
| April 2026 | pH, instantaneous minimum | 6.2 SU | ≥ 6.5 SU | — |
| August 2026 | Dichlorobromomethane, monthly average | 21 ug/L | ≤ 14 ug/L | 50% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | EFF1 |
| Turbidity | monthly average | report only (NTU) | all year | EFF1 |
| Turbidity | daily maximum | report only (NTU) | all year | EFF1 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | EFF1 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (mg/L) | 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 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 30 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 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | EFF1 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | all year | EFF1 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.4 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 | ≤ 72 mg/L | all year | EFF1 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 138 mg/L | all year | EFF1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/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 | ≤ 37 ug/L | all year | EFF1 |
| Zinc, total recoverable | monthly average | ≤ 101 ug/L | all year | EFF1 |
| Zinc, total recoverable | daily maximum | ≤ 68 ug/L | all year | EFF1 |
| Zinc, total recoverable | daily maximum | ≤ 172 ug/L | all year | EFF1 |
| Copper, total recoverable | monthly average | ≤ 14 ug/L | all year | EFF1 |
| Copper, total recoverable | monthly average | ≤ 24 ug/L | all year | EFF1 |
| Copper, total recoverable | daily maximum | ≤ 25 ug/L | all year | EFF1 |
| Copper, total recoverable | daily maximum | ≤ 55 ug/L | all year | EFF1 |
| Manganese, total recoverable | daily maximum | report only (mg/L) | all year | EFF1 |
| Dichlorobromomethane | monthly average | ≤ 8.8 ug/L | all year | EFF1 |
| Dichlorobromomethane | monthly average | ≤ 14 ug/L | all year | EFF1 |
| Dichlorobromomethane | daily maximum | ≤ 22 ug/L | all year | EFF1 |
| Dichlorobromomethane | daily maximum | ≤ 37 ug/L | all year | EFF1 |
| Dibromochloromethane | monthly average | ≤ 5 ug/L | all year | EFF1 |
| Dibromochloromethane | daily maximum | ≤ 15 ug/L | all year | EFF1 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | EFF1 |
| Diazinon | daily maximum | report only (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 |
| Diazinon + Chlorpyrifos | monthly average | ≤ 1 ug/L | all year | EFF1 |
| Diazinon + Chlorpyrifos | weekly average | ≤ 1 ug/L | all year | EFF1 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | EFF1 |
| Coliform, total general | 30-day maximum | ≤ 240 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 |
| 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 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | monthly median | ≤ 0 pass=0;fail=1 | all year | EFF1 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | daily maximum | ≤ 50 % effect | all year | EFF1 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | INF1 |
| 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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