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Chico, City of

Sewage treatment plant, major discharger, Chico, California. NPDES permit CA0079081 expired May 31, 2021; its limits still apply. Last 12 months: over a limit 3 times (last August 2026), 6 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 31 days after each period: outfall 001 form A monthly (37 values), outfall 001 form Q quarterly (6 values), outfall INF form A monthly (9 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 29 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Coliform, total general, 7-day median49 MPN/100mL≤ 23 MPN/100mL113%
May 2026Coliform, total general, 7-day median130 MPN/100mL≤ 23 MPN/100mL465%
August 2026Coliform, total general, 7-day median540 MPN/100mL≤ 23 MPN/100mL2248%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year001
Specific conductancemonthly averagereport only (umho/cm)all year001
Specific conductancedaily maximumreport only (umho/cm)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 3002 lb/dall year001
BOD, 5-day, 20 deg. Chighest weekly average≤ 4504 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedhighest weekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximum≤ 90 mg/Lall year001
Solids, total suspendedmonthly average≤ 3002 lb/dall year001
Solids, total suspendedhighest weekly average≤ 4504 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 8.2 mg/Lall year001
Nitrogen, ammonia total [as N]highest weekly average≤ 17.6 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 821 lb/dall year001
Nitrogen, ammonia total [as N]highest weekly average≤ 1761 lb/dall year001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly average≤ 60 mg/Lall year001
Nitrite + Nitrate total [as N]highest weekly average≤ 104 mg/Lall year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Copper, total recoverablemonthly average≤ 15 ug/Lall year001
Copper, total recoverabledaily maximum≤ 20 ug/Lall year001
Dichlorobromomethanemonthly average≤ 25.2 ug/Lall year001
Dichlorobromomethanedaily maximum≤ 43 ug/Lall year001
Dibromochloromethanemonthly average≤ 17.2 ug/Lall year001
Dibromochloromethanedaily maximum≤ 34 ug/Lall 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
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Coliform, total general7-day median≤ 23 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum≥ 70 % survivalall year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum≥ 70 % survivalall year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum median≥ 90 % survivalall year001
%Surv Static Renewal 96Hr 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)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 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 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 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 promelasaveragereport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
TU Static Renewal 7-Day Chronic Pimphales promelasdaily maximumreport only (tox chronic)all year001
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)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/CA0079081 · MCP: https://passage-data.com/mcp