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Oakdale, City of

Sewage treatment plant, major discharger, Oakdale, Louisiana. NPDES permit LA0033430, in force until Jul 31, 2029. Last 12 months: over a limit 36 times (last September 2026), 6 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (14 values), outfall 001 form CE monthly (11 values), outfall 001 form PI monthly (11 values), outfall 001 form Q quarterly (12 values), outfall 01A form A monthly (3 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
21 values over a limit, 0 required values missing, 18 of 52 reports late

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

All 36 values over a limit
Period endingOutfallParameterReportedLimitOver by
January 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
January 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
February 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
February 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
February 202601ANitrogen, ammonia total [as N], monthly average6.01 mg/L≤ 4 mg/L50%
February 202601ANitrogen, ammonia total [as N], monthly average62.64 lb/d≤ 61 lb/d3%
February 202601ANitrogen, ammonia total [as N], weekly average8.08 mg/L≤ 8 mg/L1%
March 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum41 %≥ 97 %58%
March 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum41 %≥ 97 %58%
April 202601ANitrogen, ammonia total [as N], monthly average7.09 mg/L≤ 4 mg/L77%
April 202601ANitrogen, ammonia total [as N], weekly average11.48 mg/L≤ 8 mg/L44%
May 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
May 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
May 202601ANitrogen, ammonia total [as N], monthly average10.27 mg/L≤ 4 mg/L157%
May 202601ANitrogen, ammonia total [as N], monthly average76.75 lb/d≤ 61 lb/d26%
May 202601ANitrogen, ammonia total [as N], weekly average12.82 mg/L≤ 8 mg/L60%
June 2026001BOD, carbonaceous [5 day, 20 C], monthly average45.58 mg/L≤ 10 mg/L356%
June 2026001BOD, carbonaceous [5 day, 20 C], monthly average655.79 lb/d≤ 153 lb/d329%
June 2026001BOD, carbonaceous [5 day, 20 C], weekly average253.19 mg/L≤ 15 mg/L1588%
June 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
June 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
June 202601ANitrogen, ammonia total [as N], monthly average116.62 lb/d≤ 61 lb/d91%
June 202601ANitrogen, ammonia total [as N], monthly average8.11 mg/L≤ 4 mg/L103%
June 202601ANitrogen, ammonia total [as N], weekly average9.41 mg/L≤ 8 mg/L18%
July 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
July 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
July 2026001Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum0 %≥ 97 %100%
July 2026001Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum0 %≥ 97 %100%
July 202601ANitrogen, ammonia total [as N], monthly average6.31 mg/L≤ 4 mg/L58%
July 202601ANitrogen, ammonia total [as N], weekly average9.98 mg/L≤ 8 mg/L25%
August 2026001Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 97 %100%
August 2026001Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 97 %100%
August 202601ANitrogen, ammonia total [as N], monthly average7.87 mg/L≤ 4 mg/L97%
August 202601ANitrogen, ammonia total [as N], weekly average10.47 mg/L≤ 8 mg/L31%
September 2026001Solids, total suspended, monthly average26.58 mg/L≤ 15 mg/L77%
September 2026001Solids, total suspended, weekly average35 mg/L≤ 23 mg/L52%

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/LJan, Feb, Dec001
Oxygen, dissolved [DO]monthly average minimum≥ 6 mg/LMar–Nov001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 313 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]weekly averagereport only (mg/L)all year001
Cadmium, total [as Cd]monthly averagereport only (mg/L)all year001
Cadmium, total [as Cd]weekly averagereport only (mg/L)all year001
Cadmium, total [as Cd]monthly averagereport only (lb/d)all year001
Cadmium, total [as Cd]weekly averagereport only (lb/d)all year001
Copper, total [as Cu]monthly averagereport only (mg/L)all year001
Copper, total [as Cu]weekly averagereport only (mg/L)all year001
Copper, total [as Cu]monthly averagereport only (lb/d)all year001
Copper, total [as Cu]weekly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .033 mg/Lall year001
Whole Effluent Toxicity [WET] - C. dubia7-day minimum≥ 97 %all year001
Whole Effluent Toxicity [WET] - C. dubiamonthly average minimum≥ 97 %all year001
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 97 %all year001
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 97 %all year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 153 lb/dall year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/Lall year01A
Nitrogen, ammonia total [as N]weekly average≤ 8 mg/Lall year01A
Nitrogen, ammonia total [as N]monthly average≤ 61 lb/dall year01A

New limits from Aug 1, 2027

ParameterNew limitFromNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average outfall 01A3.1 mg/LAug 1, 2029tighter6.01 mg/L (11 values)1.94×
Nitrogen, ammonia total [as N], weekly average outfall 01A7.4 mg/LAug 1, 2029tighter8.08 mg/L (11 values)1.09×
Cadmium, total [as Cd], monthly average outfall 0010.02 lb/dAug 1, 2027new0.009 lb/d (3 values, 3 below detection)—
Cadmium, total [as Cd], weekly average outfall 0010.05 lb/dAug 1, 2027new0.009 lb/d (3 values, 3 below detection)—

How strict are these limits?

Cited limits by parameter: Louisiana's rules and the federal ones.

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