COLUSA, CITY OF

NPDES permit CA0078999 · Minor POTW · effective, expires 2027-05-31 · 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.

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

18values over a limit
0required values missing, on 0 form(s)
0of 53 forms filed late

Last period with anything received: 2026-07-31. Most often over: % Survival Static Renewal 96Hr Acute Pimephales promelas (8), % Survival Flow Through 96Hr Acute Pimephales promelas (8), Coliform, total general (2).

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 (58)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitINST MAX report only all year
001TurbidityDAILY AV report only all year
001TurbidityINST MAX report only all year
001Specific conductanceMO AVG report only all year
001Specific conductanceDAILY MX report only all year
001Oxygen, dissolved [DO]INST MIN report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 10 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 15 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 10 mg/L all year
001Solids, total suspendedWKLY AVG <= 15 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.1 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= .6 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 3.8 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 1.4 mg/L all year
001Carbon, dissolved organic [as C]DAILY MX report only all year
001Carbon, dissolved organic [as C]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Zinc, total recoverableMO AVG <= 42 ug/L all year
001Zinc, total recoverableMO AVG <= 530 ug/L all year
001Zinc, total recoverableDAILY MX <= 84 ug/L all year
001Zinc, total recoverableDAILY MX <= 1100 ug/L all year
001Flow, in conduit or thru treatment plant2M report only all year
001Flow, in conduit or thru treatment plantDAILY MX <= .7 MGD all year
001Ultraviolet light transmittanceHM report only all year
001Ultraviolet light transmittanceDAILY MN report only all year
001Ultraviolet light dosageHM report only all year
001Ultraviolet light dosageDAILY MN report only all year
001Ultraviolet light dosageDAILY AV report only all year
001Coliform, total general3E <= 23 MPN/100mL all year
001Coliform, total general7C <= 2.2 MPN/100mL all year
001Coliform, total generalINST MAX <= 240 MPN/100mL all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001%Effect Static 4 Day Chronic Raphidocelis subcapitataMD report only all year
001%Effect Static 4 Day Chronic Raphidocelis subcapitataMAXIMUM report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMD report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMAXIMUM report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMD report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMAXIMUM report only all year
001% Survival Static Renewal 96Hr Acute Pimephales promelasMINIMUM >= 70 % survival all year
001% Survival Static Renewal 96Hr Acute Pimephales promelasBA >= 90 % survival all year
001% Survival Flow Through 96Hr Acute Pimephales promelasMINIMUM >= 70 % survival all year
001% Survival Flow Through 96Hr Acute Pimephales promelasBA >= 90 % survival all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMD report only all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMAXIMUM report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMD report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMAXIMUM report only all year
001Static 96Hr Chronic Selen. CapricornutumMD report only all year
001Static 96Hr Chronic Selen. CapricornutumMAXIMUM report only all year
INFSpecific conductanceDAILY MX 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
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