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Sewage treatment plant, Chester, California. NPDES permit CA0077747 expired Mar 30, 2021; its limits still apply. Last 12 months: no values over a limit, 11 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | instantaneous maximum | report only (deg F) | 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 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 90 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 130 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | highest weekly average | ≤ 190 lb/d | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | highest weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 130 lb/d | all year | 001 |
| Solids, total suspended | highest weekly average | ≤ 190 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.4 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 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 |
| Phosphate, total [as PO4] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphate, total [as PO4] | 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 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/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 |
| Copper, dissolved [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, dissolved [as Zn] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Aluminum, dissolved [as Al] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 34 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 43 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 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Coliform, total general | 7-day median | ≤ 23 MPN/100mL | all year | 001 |
| Coliform, total general | instantaneous maximum | ≤ 500 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 |
| %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 |
| 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 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | INF |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | 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 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | INF |
| Solids, total suspended | daily maximum | report only (lb/d) | 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/CA0077747 · MCP: https://passage-data.com/mcp