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Opelousas City of - Candy Street WWTF

Sewage treatment plant, major discharger, Opelousas, Louisiana. NPDES permit LA0036404, in force until Sep 30, 2030. Last 12 months: over a limit 45 times (last August 2026), 44 required values missing, 11 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (17 values), form CD monthly (11 values), form PI monthly (11 values), form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
51 values over a limit, 3 required values missing, 1 of 24 reports late

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

All 45 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, instantaneous maximum1.17 mg/L≤ .033 mg/L3445%
October 2025Coliform, fecal general, weekly geometric mean1218 #/100mL≤ 400 #/100mL205%
November 2025Chlorine, total residual, instantaneous maximum.2 mg/L≤ .033 mg/L506%
November 2025Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
November 2025Nitrogen, ammonia total [as N], monthly average2.08 mg/L≤ 2 mg/L4%
November 2025Solids, total suspended, monthly average51 mg/L≤ 10 mg/L410%
November 2025Solids, total suspended, monthly average874 lb/d≤ 275 lb/d218%
November 2025Solids, total suspended, weekly average94 mg/L≤ 15 mg/L527%
November 2025Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum85 %≥ 98 %13%
November 2025Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum85 %≥ 98 %13%
November 2025Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum85 %≥ 98 %13%
November 2025Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum85 %≥ 98 %13%
December 2025Chlorine, total residual, instantaneous maximum.1 mg/L≤ .033 mg/L203%
December 2025Coliform, fecal general, weekly geometric mean469 #/100mL≤ 400 #/100mL17%
December 2025Nitrogen, ammonia total [as N], weekly average5.07 mg/L≤ 4 mg/L27%
January 2026Chlorine, total residual, instantaneous maximum.7 mg/L≤ .033 mg/L2021%
January 2026Coliform, fecal general, weekly geometric mean862.7 #/100mL≤ 400 #/100mL116%
February 2026Chlorine, total residual, instantaneous maximum1.37 mg/L≤ .033 mg/L4052%
February 2026Coliform, fecal general, weekly geometric mean416.5 #/100mL≤ 400 #/100mL4%
February 2026Nitrogen, ammonia total [as N], monthly average4.22 mg/L≤ 4.1 mg/L3%
February 2026Nitrogen, ammonia total [as N], weekly average8.46 mg/L≤ 8.2 mg/L3%
February 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum85 %≥ 98 %13%
February 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum85 %≥ 98 %13%
March 2026Chlorine, total residual, instantaneous maximum.36 mg/L≤ .033 mg/L991%
March 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
March 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum85 %≥ 98 %13%
March 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum85 %≥ 98 %13%
March 2026Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum85 %≥ 98 %13%
March 2026Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum85 %≥ 98 %13%
April 2026Chlorine, total residual, instantaneous maximum.27 mg/L≤ .033 mg/L718%
April 2026Coliform, fecal general, monthly geometric mean700.8 #/100mL≤ 200 #/100mL250%
April 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
April 2026Nitrogen, ammonia total [as N], monthly average10.2 mg/L≤ 4.1 mg/L149%
April 2026Nitrogen, ammonia total [as N], monthly average178 lb/d≤ 113 lb/d58%
April 2026Nitrogen, ammonia total [as N], weekly average13.3 mg/L≤ 8.2 mg/L62%
April 2026Oxygen, dissolved [DO], monthly average minimum5.9 mg/L≥ 6 mg/L2%
April 2026Solids, total suspended, monthly average25 mg/L≤ 20 mg/L25%
April 2026Solids, total suspended, weekly average36 mg/L≤ 30 mg/L20%
May 2026Chlorine, total residual, instantaneous maximum.05 mg/L≤ .033 mg/L52%
June 2026BOD, carbonaceous, percent removal, minimum67 %≥ 85 %120%
June 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum0 %≥ 98 %100%
June 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum0 %≥ 98 %100%
July 2026Nitrogen, ammonia total [as N], weekly average5.15 mg/L≤ 4 mg/L29%
August 2026Nitrogen, ammonia total [as N], monthly average2.7 mg/L≤ 2 mg/L35%
August 2026Nitrogen, ammonia total [as N], weekly average5.54 mg/L≤ 4 mg/L39%

Limits in force (60)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 6 mg/Lall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 10 mg/LMay–Dec
Solids, total suspendedmonthly average≤ 20 mg/LJan–Apr
Solids, total suspendedweekly average≤ 15 mg/LMay–Dec
Solids, total suspendedweekly average≤ 30 mg/LJan–Apr
Solids, total suspendedmonthly average≤ 275 lb/dMay–Dec
Solids, total suspendedmonthly average≤ 550 lb/dJan–Apr
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 4.1 mg/LJan–Apr
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LMay–Dec
Nitrogen, ammonia total [as N]weekly average≤ 8.2 mg/LJan–Apr
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LMay–Dec
Nitrogen, ammonia total [as N]monthly average≤ 113 lb/dJan–Apr
Nitrogen, ammonia total [as N]monthly average≤ 55 lb/dMay–Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Whole Effluent Toxicity [WET] - C. dubia7-day minimum≥ 98 %all year
Whole Effluent Toxicity [WET] - C. dubiamonthly average minimum≥ 98 %all year
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 98 %all year
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 98 %all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 550 lb/dJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 275 lb/dMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year
BOD, carbonaceous, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year

How strict are these limits?

Cited limits by parameter: Louisiana'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/LA0036404 · MCP: https://passage-data.com/mcp