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Sewerage Systems, major discharger, Lathrop, California. NPDES permit CA0085359, in force until Mar 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | all year | 001 |
| 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 |
| Temp. diff. between samp. & upstrm deg. F | maximum | ≤ 20 deg F | all year | 001 |
| Turbidity | monthly average | report only (NTU) | all year | 001 |
| Turbidity | monthly average | report only (NTU) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | all year | 001 |
| Turbidity | instantaneous maximum | ≤ .5 NTU | all year | 001 |
| Specific conductance | annual average | ≤ 1600 umho/cm | all year | 001 |
| Specific conductance | annual average | ≤ 1600 umho/cm | all year | 001 |
| Specific conductance | monthly 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 |
| 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 | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 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 | ≤ 1.1 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.5 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 |
| 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 |
| Barium, total [as Ba] | monthly average | ≤ 280 ug/L | all year | 001 |
| Barium, total [as Ba] | weekly average | ≤ 330 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ 2.3 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 5 ug/L | all year | 001 |
| Dichlorobromomethane | monthly average | ≤ 36 ug/L | all year | 001 |
| Dichlorobromomethane | daily maximum | ≤ 71 ug/L | all year | 001 |
| Bromoform | monthly average | ≤ 17 ug/L | all year | 001 |
| Bromoform | daily maximum | ≤ 34 ug/L | all year | 001 |
| Dibromochloromethane | monthly average | ≤ 15 ug/L | all year | 001 |
| Dibromochloromethane | daily maximum | ≤ 27 ug/L | all year | 001 |
| Chloroform | monthly average | ≤ 130 ug/L | all year | 001 |
| Chloroform | daily maximum | ≤ 260 ug/L | all year | 001 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | 001 |
| Chlorpyrifos | daily maximum | report only (ug/L) | all year | 001 |
| Diazinon | daily maximum | report only (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 |
| Chlorine, total residual | 4-day average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | 1-hour average | ≤ .019 mg/L | all year | 001 |
| Turbidity, time above limit | maximum | ≤ 72 min/d | all year | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | annual total | ≤ 12 g/yr | all year | 001 |
| Mercury, total recoverable | annual total | ≤ 12 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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | 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) | average | report only (tox chronic) | all year | 001 |
| TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum) | maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | average | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Ceriodaphnia dubia | maximum | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | average | report only (tox chronic) | all year | 001 |
| TU Static Renewal 7-Day Chronic Pimphales promelas | maximum | report only (tox chronic) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelas | maximum | report only (% effect) | all year | 001 |
| Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubia | value | report only (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 Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | value | report only (pass=0;fail=1) | all year | 001 |
| Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitata | 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 |
| 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/CA0085359 · MCP: https://passage-data.com/mcp