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Donner Summit Public Utility District

Sewage treatment plant, Soda Springs, California. NPDES permit CA0081621 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 4 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall 001 form A monthly (34 values), outfall 001 form Q quarterly (3 values), outfall INF form A monthly (6 values), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
5 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
December 2025Nitrogen, ammonia total [as N], weekly average6.9 mg/L≤ 3.8 mg/L82%
January 2026Zinc, total recoverable, daily maximum120 ug/L≤ 60 ug/L100%
January 2026Zinc, total recoverable, monthly average99 ug/L≤ 30 ug/L230%
February 2026Zinc, total recoverable, monthly average50 ug/L≤ 30 ug/L67%

Limits in force (77)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year001
Specific conductancedaily maximumreport only (umho/cm)all year001
Specific conductanceannual average≤ 500 umho/cmall year001
Specific conductanceannual average≤ 500 umho/cmall year001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)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≤ 1.8 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/Lall year001
Nitrogen, nitrite total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, nitrate total [as N]monthly averagereport 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≤ 22 mg/Lall year001
Carbon, dissolved organic [as C]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Nickel, total recoverablemonthly average≤ 22 ug/Lall year001
Nickel, total recoverabledaily maximum≤ 43 ug/Lall year001
Silver total recoverablemonthly average≤ .23 ug/Lall year001
Silver total recoverabledaily maximum≤ .45 ug/Lall year001
Zinc, total recoverablemonthly average≤ 30 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 60 ug/Lall year001
Lead, total recoverablemonthly average≤ .72 ug/Lall year001
Lead, total recoverabledaily maximum≤ 1.5 ug/Lall year001
Copper, total recoverablemonthly average≤ 6 ug/Lall year001
Copper, total recoverabledaily maximum≤ 18 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 general7-day median≤ 2.2 MPN/100mLall year001
Coliform, total general30-day maximum≤ 23 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
%Effect Statre 4Day Chronic Selen. Capr.medianreport only (% effect)all year001
%Effect Statre 4Day Chronic Selen. Capr.medianreport only (% effect)all year001
%Effect Statre 4Day Chronic Selen. Capr.maximumreport only (% effect)all year001
%Effect Statre 4Day Chronic Selen. Capr.maximumreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamedianreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamedianreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamaximumreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamaximumreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmedianreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmedianreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (% effect)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
% Survival Flow Through 96Hr Acute Oncorhynchus mykissminimum≥ 70 % survivalall year001
% Survival Flow Through 96Hr Acute Oncorhynchus mykissminimum≥ 70 % survivalall year001
% Survival Flow Through 96Hr Acute Oncorhynchus mykissminimum median≥ 90 % survivalall year001
% Survival Flow Through 96Hr Acute 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
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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CA0081621 · MCP: https://passage-data.com/mcp