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Arnaudville, Town of

Sewage treatment plant, Arnaudville, Louisiana. NPDES permit LA0046639, in force until Feb 28, 2029. Last 12 months: over a limit 18 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (34 values), form Q quarterly (6 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
23 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, weekly geometric mean547.5 #/100mL≤ 400 #/100mL37%
November 2025Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
November 2025Solids, total suspended, monthly average25 mg/L≤ 15 mg/L67%
November 2025Solids, total suspended, weekly average38 mg/L≤ 23 mg/L65%
December 2025Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
December 2025Solids, total suspended, monthly average18 mg/L≤ 15 mg/L20%
December 2025Solids, total suspended, weekly average30 mg/L≤ 23 mg/L30%
January 2026Coliform, fecal general, weekly geometric mean686.7 #/100mL≤ 400 #/100mL72%
March 2026Oxygen, dissolved [DO], monthly average minimum4.6 mg/L≥ 5 mg/L8%
April 2026Oxygen, dissolved [DO], monthly average minimum2.4 mg/L≥ 5 mg/L52%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average33 lb/d≤ 30 lb/d10%
May 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
May 2026Oxygen, dissolved [DO], monthly average minimum3.2 mg/L≥ 5 mg/L36%
May 2026Solids, total suspended, monthly average16 mg/L≤ 15 mg/L7%
May 2026Solids, total suspended, monthly average62 lb/d≤ 45 lb/d38%
June 2026Coliform, fecal general, monthly geometric mean862.7 #/100mL≤ 200 #/100mL331%
June 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
June 2026Oxygen, dissolved [DO], monthly average minimum3.5 mg/L≥ 5 mg/L30%

Limits in force (52)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LMay–Dec
Solids, total suspendedmonthly average≤ 15 mg/LMay–Dec
Solids, total suspendedmonthly average≤ 20 mg/LJan–Apr
Solids, total suspendedmonthly average≤ 20 mg/LJan–Apr
Solids, total suspendedweekly average≤ 23 mg/LMay–Dec
Solids, total suspendedweekly average≤ 23 mg/LMay–Dec
Solids, total suspendedweekly average≤ 30 mg/LJan–Apr
Solids, total suspendedweekly average≤ 30 mg/LJan–Apr
Solids, total suspendedmonthly average≤ 45 lb/dMay–Dec
Solids, total suspendedmonthly average≤ 45 lb/dMay–Dec
Solids, total suspendedmonthly average≤ 60 lb/dJan–Apr
Solids, total suspendedmonthly average≤ 60 lb/dJan–Apr
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≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dall year
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 plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/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≤ 20 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Dec
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≤ 30 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 60 lb/dJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 60 lb/dJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 30 lb/dMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 30 lb/dMay–Dec

New limits from Mar 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.033 mg/Lnew0.27 mg/L (9 values)8.18×

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/LA0046639 · MCP: https://passage-data.com/mcp