Mt. Shasta, City of

NPDES permit CA0078051 · Minor POTW · effective, expires 2028-05-31 · 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

4values over a limit
0required values missing, on 0 form(s)
0of 29 forms filed late

Last period with anything received: 2026-08-31. Most often over: Zinc, total recoverable (3), Copper, total recoverable (1).

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 (98)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitINST MAX report only all year
001TurbidityINST MAX report only all year
001Specific conductanceDAILY MX 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
001Alkalinity, total [as CaCO3]DAILY MX report only all year
001Alkalinity, total [as CaCO3]DAILY MX report only 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 <= 5.7 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 8.9 mg/L 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 <= 10 mg/L all year
001Nitrite + Nitrate total [as N]WKLY AVG <= 22 mg/L all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]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
001Hardness, total [as CaCO3]DAILY MX report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Calcium, total recoverableDAILY MX report only all year
001Calcium, total recoverableDAILY MX report only all year
001Magnesium, total recoverableDAILY MX report only all year
001Magnesium, total recoverableDAILY MX report only all year
001Sodium, total recoverableDAILY MX report only all year
001Sodium, total recoverableDAILY MX report only all year
001Potassium, total recoverableDAILY MX report only all year
001Potassium, total recoverableDAILY MX report only all year
001Chloride [as Cl]DAILY MX report only all year
001Chloride [as Cl]DAILY MX report only all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableDAILY MX report only all year
001Boron, total recoverableDAILY MX report only all year
001Boron, total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG <= 26 ug/L all year
001Zinc, total recoverableDAILY MX <= 46 ug/L all year
001Copper, total recoverableMO AVG <= 10 ug/L all year
001Copper, total recoverableDAILY MX <= 18 ug/L all year
001Manganese, total recoverableDAILY MX report only all year
001Manganese, total recoverableDAILY MX report only 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
001Bicarbonate as [CaCO3]DAILY MX report only all year
001Bicarbonate as [CaCO3]DAILY MX report only all year
001Carbonate ion [as CaCO3]DAILY MX report only all year
001Carbonate ion [as CaCO3]DAILY MX report only all year
001HydroxideDAILY MX report only all year
001HydroxideDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Coliform, total general7C <= 2.2 MPN/100mL all year
001Coliform, total general3E <= 23 MPN/100mL all year
001Coliform, total general7C <= 23 MPN/100mL all year
001Coliform, total generalINST MAX <= 240 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 <= 25 % effect all year
001%Effect Static 4 Day Chronic Raphidocelis subcapitataMD <= 25 % effect all year
001%Effect Static 4 Day Chronic Raphidocelis subcapitataDAILY MX report only all year
001%Effect Static 4 Day Chronic Raphidocelis subcapitataDAILY MX report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMD <= 25 % effect all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaMD <= 25 % effect all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMD <= 25 % effect all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasMD <= 25 % effect all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasDAILY MX report only all year
001%Effect Static Renewal 7Day Chronic Pimephales promelasDAILY MX report only 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% Survival Flow Through 96Hr Acute Oncorhynchus mykissMINIMUM >= 70 % survival all year
001% Survival Flow Through 96Hr Acute Oncorhynchus mykissBA >= 90 % survival all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MD <= 2 tox chronic all year
001TU Static 4 Day Chronic Raphidocelis subcapitata (formerly Selenastrum capricornutum)MD <= 2 tox chronic 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 dubiaMD <= 2 tox chronic all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMD <= 2 tox chronic 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 promelasMD <= 2 tox chronic all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMD <= 2 tox chronic 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
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