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Sewage treatment plant, Portola, California. NPDES permit CA0077844, in force until May 31, 2029. Last 12 months: over a limit 6 times (last March 2026), 7 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | BOD, 5-day, percent removal, monthly average | 80 % | ≤ 65 % | 43% |
| January 2026 | Solids, suspended percent removal, monthly average | 90 % | ≤ 65 % | 71% |
| February 2026 | BOD, 5-day, percent removal, monthly average | 78 % | ≤ 65 % | 37% |
| February 2026 | Solids, suspended percent removal, monthly average | 81 % | ≤ 65 % | 46% |
| March 2026 | BOD, 5-day, percent removal, monthly average | 80 % | ≤ 65 % | 43% |
| March 2026 | Copper, total recoverable, monthly average | < 40 ug/L | ≤ 22 ug/L | 82% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | EFF1 |
| Chlorine, total residual | monthly average | report only (mg/L) | all year | EFF1 |
| Coliform, total colony forming units | daily maximum | report only (MPN/100mL) | all year | EFF1 |
| Coliform, total colony forming units | monthly average | report only (MPN/100mL) | all year | EFF1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | EFF2 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | EFF2 |
| Conductivity | daily maximum | report only (umho/cm) | all year | EFF2 |
| Conductivity | monthly average | report only (umho/cm) | all year | EFF2 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | EFF2 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | EFF2 |
| pH | daily maximum | ≤ 6 SU | all year | EFF2 |
| pH | instantaneous maximum | ≤ 9 SU | all year | EFF2 |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | EFF2 |
| Alkalinity, bicarbonate [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF2 |
| Alkalinity, carbonate [as CaCO3] | monthly average | report only (mg/L) | all year | EFF2 |
| Alkalinity, carbonate [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF2 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | EFF2 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | EFF2 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | EFF2 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | all year | EFF2 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 29 mg/L | all year | EFF2 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ 20 mg/L | all year | EFF2 |
| Nitrite + Nitrate total [as N] | weekly average | ≤ 37 mg/L | all year | EFF2 |
| Phosphorous, total recoverable | monthly average | report only (mg/L) | all year | EFF2 |
| Phosphorous, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | all year | EFF2 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | EFF2 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | EFF2 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | EFF2 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Potassium, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Chloride, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | EFF2 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | EFF2 |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | EFF2 |
| Copper, dissolved [as Cu] | daily maximum | report only (ug/L) | all year | EFF2 |
| Copper, dissolved [as Cu] | monthly average | report only (ug/L) | all year | EFF2 |
| Iron, dissolved [as Fe] | daily maximum | report only (ug/L) | all year | EFF2 |
| Iron, dissolved [as Fe] | monthly average | report only (ug/L) | all year | EFF2 |
| Manganese, dissolved [as Mn] | daily maximum | report only (ug/L) | all year | EFF2 |
| Manganese, dissolved [as Mn] | monthly average | report only (ug/L) | all year | EFF2 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | EFF2 |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year | EFF2 |
| Aluminum, dissolved [as Al] | daily maximum | report only (ug/L) | all year | EFF2 |
| Aluminum, dissolved [as Al] | monthly average | report only (ug/L) | all year | EFF2 |
| Copper, total recoverable | monthly average | ≤ 22 ug/L | all year | EFF2 |
| Copper, total recoverable | daily maximum | ≤ 44 ug/L | all year | EFF2 |
| Manganese, total recoverable | daily maximum | report only (ug/L) | all year | EFF2 |
| Manganese, total recoverable | monthly average | report only (ug/L) | all year | EFF2 |
| Hydroxide | monthly average | report only (mg/L) | all year | EFF2 |
| Hydroxide | daily maximum | report only (mg/L) | all year | EFF2 |
| Flow | daily maximum | report only (MGD) | all year | EFF2 |
| Flow | monthly average | report only (MGD) | all year | EFF2 |
| BOD, 5-day, percent removal | monthly average | ≤ 65 % | all year | EFF2 |
| Solids, suspended percent removal | monthly average | ≤ 65 % | all year | EFF2 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (% effect) | all year | EFF2 |
| %Effect Static Renewal 96Hr Acute Oncorhynchus mykiss | monthly average | report only (% effect) | all year | EFF2 |
| %Effect Static Renewal 96Hr Acute Oncorhynchus mykiss | daily maximum | ≤ 120 % effect | all year | EFF2 |
| Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykiss | daily maximum | report only (pass=0;fail=1) | all year | EFF2 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (pass=0;fail=1) | all year | EFF2 |
| Conductivity | daily maximum | report only (umho/cm) | all year | INF1 |
| Conductivity | monthly average | report only (umho/cm) | all year | INF1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF1 |
| pH | daily maximum | report only (SU) | all year | INF1 |
| pH | monthly average | report only (SU) | all year | INF1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | INF1 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF1 |
| Flow | daily maximum | report only (MGD) | all year | INF1 |
| Flow | monthly average | report only (MGD) | all year | INF1 |
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/CA0077844 · MCP: https://passage-data.com/mcp