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Ferndale, City of

Sewage treatment plant, Ferndale, California. NPDES permit CA0022721 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 9 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 32 days after each period: outfall 001 form A quarterly (27 values), outfall INF form A monthly (4 values), outfall 001 form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 25 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025%Surv Static Renewal 96Hr Oncorhynchus mykiss, minimum median.7 % survival≥ 90 % survival99%
December 2025%Surv Static Renewal 96Hr Oncorhynchus mykiss, minimum.6 % survival≥ 70 % survival99%
December 202596Hr Acute Ceriodaphn. Dubia % Srv, minimum median.7 % survival≥ 90 % survival99%
December 202596Hr Acute Ceriodaphn. Dubia % Srv, minimum.6 % survival≥ 70 % survival99%
January 2026Solids, settleable, daily maximum2.8 mL/L≤ .2 mL/L1300%
January 2026Solids, settleable, monthly average< 2 mL/L≤ .1 mL/L1900%
January 2026Solids, suspended percent removal, monthly average minimum.99 %≥ 85 %560%
February 2026BOD, 5-day, percent removal, monthly average minimum.98 %≥ 85 %560%
March 2026Solids, suspended percent removal, monthly average minimum.98 %≥ 85 %560%

Limits in force (50)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all 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
Solids, settleablemonthly average≤ .1 mL/Lall year001
Solids, settleabledaily maximum≤ .2 mL/Lall year001
Nitrogen, total [as N]monthly average≤ 10 mg/Lall year001
Nitrogen, organic total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 1 mg/Lall year001
Nitrogen, ammonia, tot unionized [as N]daily maximumreport only (mg/L)all 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
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Discharge flow as % of stream flowdaily maximumreport only (%)all 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 median≤ 23 MPN/100mLall year001
Coliform, total generalmaximum single sample≤ 240 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
%Effect Static 4 Day Chronic Raphidocelis subcapitatamonthly medianreport only (% effect)all year001
%Effect Static Renewal 96Hr Acute Ceriodaphnia dubiamonthly medianreport only (% effect)all year001
%Effect Static Renewal 96Hr Acute Oncorhynchus mykissmonthly medianreport only (% effect)all year001
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly medianreport only (% effect)all year001
%Effect Static Renewal 7Day Chronic Pimephales promelasmonthly medianreport only (% effect)all year001
Pass/Fail Static 4 Day Chronic Raphidocelis subcapitatamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static 4 Day Chronic Raphidocelis subcapitatadaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubiadaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykissmonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 96Hr Acute Oncorhynchus mykissdaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly medianreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasdaily maximumreport only (pass=0;fail=1)all year001
96Hr Acute Ceriodaphn. Dubia % Srvminimum≥ 70 % survivalall year001
96Hr Acute Ceriodaphn. Dubia % Srvminimum median≥ 90 % survivalall year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum≥ 70 % survivalall year001
%Surv Static Renewal 96Hr Oncorhynchus mykissminimum median≥ 90 % survivalall year001
BOD, 5-day, 20 deg. Cdaily maximumreport 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/CA0022721 · MCP: https://passage-data.com/mcp