Chico, City of

NPDES permit CA0079081 · Major POTW · expired, expires 2021-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2021-05-31 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

3values over a limit
0required values missing, on 0 form(s)
0of 27 forms filed late

Last period with anything received: 2026-07-31. Most often over: Coliform, total general (3).

Reporting

Reports are due about 32 days after each monitoring period ends (the most common figure among CA permits in EPA's filings — check your permit).

Limits in force (64)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeINST MAX report only all year
001Specific conductanceMO AVG report only all year
001Specific conductanceDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CHI WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 90 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 3002 lb/d all year
001BOD, 5-day, 20 deg. CHI WK AV <= 4504 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedHI WK AV <= 45 mg/L all year
001Solids, total suspendedDAILY MX <= 90 mg/L all year
001Solids, total suspendedMO AVG <= 3002 lb/d all year
001Solids, total suspendedHI WK AV <= 4504 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 8.2 mg/L all year
001Nitrogen, ammonia total [as N]HI WK AV <= 17.6 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 821 lb/d all year
001Nitrogen, ammonia total [as N]HI WK AV <= 1761 lb/d all year
001Nitrogen, nitrite total [as N]DAILY MX report only all year
001Nitrogen, nitrate total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG <= 60 mg/L all year
001Nitrite + Nitrate total [as N]HI WK AV <= 104 mg/L all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Copper, total recoverableMO AVG <= 15 ug/L all year
001Copper, total recoverableDAILY MX <= 20 ug/L all year
001DichlorobromomethaneMO AVG <= 25.2 ug/L all year
001DichlorobromomethaneDAILY MX <= 43 ug/L all year
001DibromochloromethaneMO AVG <= 17.2 ug/L all year
001DibromochloromethaneDAILY MX <= 34 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residual4A <= .011 mg/L all year
001Chlorine, total residual1I <= .019 mg/L all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Coliform, total general7C <= 23 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001%Surv Static Renewal 96Hr Oncorhynchus mykissMINIMUM >= 70 % survival all year
001%Surv Static Renewal 96Hr Oncorhynchus mykissMINIMUM >= 70 % survival all year
001%Surv Static Renewal 96Hr Oncorhynchus mykissBA >= 90 % survival all year
001%Surv Static Renewal 96Hr Oncorhynchus mykissBA >= 90 % survival all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)AVERAGE report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)AVERAGE report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX report only all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)DAILY MX report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaAVERAGE report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaAVERAGE report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasAVERAGE report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasAVERAGE report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasDAILY MX report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasDAILY MX report only all year
INFTemperature, water deg. fahrenheitINST MAX report only all year
INFBOD, 5-day, 20 deg. CMO AVG report only all year
INFBOD, 5-day, 20 deg. CDAILY MX report only all year
INFpHMINIMUM report only all year
INFpHMAXIMUM report only all year
INFSolids, total suspendedMO AVG report only all year
INFSolids, total suspendedDAILY MX report only all year
INFFlow, in conduit or thru treatment plantMO AVG report only all year
INFFlow, in conduit or thru treatment plantDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states