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Shasta Lake, City of

Sewage treatment plant, major discharger, Shasta Lake, California. NPDES permit CA0079511 expired Jan 31, 2026; its limits still apply. Last 12 months: over a limit 8 times (last August 2026), 5 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (31 values), outfall 001 form Q quarterly (2 values), outfall INF form A monthly (6 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
16 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
February 2026Zinc, total recoverable, daily maximum41.8 ug/L≤ 40 ug/L5%
February 2026Zinc, total recoverable, monthly average41.8 ug/L≤ 30 ug/L39%
May 2026Zinc, total recoverable, monthly average36.8 ug/L≤ 30 ug/L23%
June 2026Zinc, total recoverable, daily maximum42.5 ug/L≤ 40 ug/L6%
June 2026Zinc, total recoverable, monthly average42.5 ug/L≤ 30 ug/L42%
July 2026Zinc, total recoverable, daily maximum44 ug/L≤ 40 ug/L10%
July 2026Zinc, total recoverable, monthly average44 ug/L≤ 30 ug/L47%
August 2026Zinc, total recoverable, monthly average31 ug/L≤ 30 ug/L3%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year001
Turbiditymonthly averagereport only (NTU)all year001
Turbiditydaily maximumreport only (NTU)all year001
Specific conductanceannual average≤ 480 umho/cmall year001
Specific conductanceannual average≤ 480 umho/cmall year001
Specific conductancedaily maximumreport only (umho/cm)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 10 mg/Lall year001
Solids, total suspendedweekly average≤ 15 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ .73 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 1.58 mg/Lall 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≤ 10 mg/Lall year001
Nitrite + Nitrate total [as N]weekly average≤ 18 mg/Lall year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Iron, total recoverabledaily maximumreport only (ug/L)all year001
Iron, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly average≤ 30 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 40 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
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Coliform, total general30-day maximum≤ 23 MPN/100mLall year001
Coliform, total general7-day median≤ 2.2 MPN/100mLall year001
Coliform, total generalinstantaneous maximum≤ 240 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 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
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasvaluereport only (pass=0;fail=1)all year001
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasvaluereport only (pass=0;fail=1)all year001
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmaximumreport only (% effect)all year001
Chronic Mthd, Survival Endpt %Effect, Growth Endpt Median TSTcHo R/nR Pass/Fail, StatR7d P promelasmaximumreport only (% effect)all year001
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiavaluereport only (pass=0;fail=1)all year001
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiavaluereport only (pass=0;fail=1)all year001
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamaximumreport only (% effect)all year001
Chronic Mthd, Survival Endpt %Effect, Reprod Endpt Median TSTcHo R/nR Pass/Fail, StatR8dmax C dubiamaximumreport only (% effect)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatavaluereport only (pass=0;fail=1)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatavaluereport only (pass=0;fail=1)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamaximumreport only (% effect)all year001
Chronic Mthd Growth Endpt, %Effect, Median TSTcHo R/nR Pass/Fail, Static96hr R subcapitatamaximumreport only (% effect)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)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/CA0079511 · MCP: https://passage-data.com/mcp