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Sewage treatment plant, major discharger, Mountain House, California. NPDES permit CA0084271, in force until Jul 31, 2028. Last 12 months: over a limit 3 times (last July 2026), 3 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Mercury, total recoverable, annual total | .796 g/yr | ≤ .37 g/yr | 116% |
| December 2025 | Temp. diff. between samp. & upstrm deg. F, maximum | 23.6 deg F | ≤ 20 deg F | 18% |
| July 2026 | Temp. diff. between samp. & upstrm deg. F, maximum | 80.8 deg F | ≤ 20 deg F | 304% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 001 |
| Temp. diff. between samp. & upstrm deg. F | maximum | ≤ 20 deg F | all year | 001 |
| Specific conductance | annual average | report only (umho/cm) | all year | 001 |
| Specific conductance | daily maximum | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | report only (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 | ≤ 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 | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 15 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.9 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | report only (lb/d) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 16 mg/L | all year | 001 |
| Carbon, dissolved organic [as C] | 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 |
| Dichlorobromomethane | monthly average | ≤ 1.7 ug/L | all year | 001 |
| Dichlorobromomethane | daily maximum | ≤ 4.4 ug/L | all year | 001 |
| Dibromochloromethane | monthly average | ≤ 2.1 ug/L | all year | 001 |
| Dibromochloromethane | daily maximum | ≤ 5.3 ug/L | all year | 001 |
| Diazinon | daily maximum | report only (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 |
| Diazinon + Chlorpyrifos | monthly average | ≤ 1 Ratio | all year | 001 |
| Diazinon + Chlorpyrifos | weekly average | ≤ 1 Ratio | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | annual total | ≤ 4.7 g/yr | all year | 001 |
| Mercury, total recoverable | annual total | ≤ .37 g/yr | 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 | maximum single sample | ≤ 240 MPN/100mL | all year | 001 |
| Methylmercury | daily maximum | report only (ng/L) | all year | 001 |
| Methylmercury | daily maximum | report only (ng/L) | all year | 001 |
| Methylmercury | annual total | report only (g/yr) | 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 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | maximum | report only (% effect) | all year | 001 |
| Specific conductance | monthly average | report only (umho/cm) | all year | INF |
| Specific conductance | daily maximum | report only (umho/cm) | all year | INF |
| 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 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | INF |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | INF |
Cited limits by parameter: California's rules and the federal ones.
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