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Oroville Region, Sewerage Commission

Sewage treatment plant, major discharger, Oroville, California. NPDES permit CA0079235 expired Sep 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall 001 form A monthly (34 values), outfall 001 form Q quarterly (5 values), outfall INF form A monthly (8 values), outfall INF form Q quarterly (1 value), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 33 reports late

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year001
Turbiditydaily maximumreport only (NTU)all year001
Specific conductancedaily maximumreport only (umho/cm)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 25 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 1100 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 1400 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendedweekly average≤ 25 mg/Lall year001
Solids, total suspendedmonthly average≤ 1100 lb/dall year001
Solids, total suspendedweekly average≤ 1400 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 33 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 58 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 1800 lb/dall year001
Nitrogen, ammonia total [as N]weekly average≤ 3100 lb/dall year001
Nitrite + Nitrate total [as N]monthly average≤ 40 mg/Lall year001
Nitrite + Nitrate total [as N]weekly average≤ 79 mg/Lall year001
Carbon, dissolved organic [as C]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Zinc, total recoverablemonthly average≤ 110 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 170 ug/Lall year001
Aluminum, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverablemonthly average≤ 23 ug/Lall year001
Copper, total recoverabledaily maximum≤ 30 ug/Lall year001
Dichlorobromomethanemonthly average≤ 9.6 ug/Lall year001
Dichlorobromomethanedaily maximum≤ 27 ug/Lall year001
Chlorpyrifosmonthly averagereport only (ug/L)all year001
Chlorpyrifosweekly averagereport only (ug/L)all year001
Diazinonmonthly averagereport only (ug/L)all year001
Diazinonweekly averagereport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residual4-day average≤ .011 mg/Lall year001
Chlorine, total residual1-hour average≤ .019 mg/Lall year001
Specific Conductanceannual average≤ 506 umho/secall year001
Diazinon + Chlorpyrifosmonthly average≤ 1 ug/Lall year001
Diazinon + Chlorpyrifosweekly average≤ 1 ug/Lall year001
Coliform, total general7-day median≤ 23 MPN/100mLall year001
Coliform, total general30-day maximum≤ 240 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
%Effect Static 4 Day Chronic Raphidocelis subcapitatamonthly medianreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly medianreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmonthly medianreport only (% effect)all year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum≥ 70 % survivalall year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum median≥ 90 % survivalall year001
% Survival Flow Through 96Hr Acute Oncorhynchus mykissminimum≥ 70 % survivalall year001
% Survival Flow Through 96Hr Acute Oncorhynchus mykissminimum median≥ 90 % survivalall year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)averagereport only (tox chronic)all year001
TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)daily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiadaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
Specific conductancedaily maximumreport only (umho/cm)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF
pHminimumreport only (SU)all yearINF
pHmaximumreport only (SU)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

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/CA0079235 · MCP: https://passage-data.com/mcp