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Mer Rouge, Village of

Sewage treatment plant, Mer Rouge, Louisiana. NPDES permit LA0043974, in force until Sep 14, 2028. Last 12 months: over a limit 2 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (26 values), outfall 001 form Q quarterly (6 values), outfall 01A form A quarterly (6 values)
Renewal application due
Mar 18, 2028 · 180 days before expiry; your permit may set another date
Last report on file
July 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 3 of 28 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, monthly average18.45 mg/L≤ 15 mg/L23%
February 2026Solids, total suspended, monthly average15.71 mg/L≤ 15 mg/L5%

Limits in force (38)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 63 lb/dall year001
Solids, total suspendedmonthly average≤ 63 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
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/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]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 42 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 42 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year01A
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year01A
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year01A
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year01A
Nitrogen, ammonia total [as N]monthly average≤ 21 lb/dall year01A
Nitrogen, ammonia total [as N]monthly average≤ 21 lb/dall year01A

New limits from Sep 14, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.8 mg/Ltighter1.53 mg/L (10 values, 2 below detection)0.85×
Nitrogen, ammonia total [as N], monthly average7.6 lb/dtighter0.085 lb/d (10 values)0.0112×
Nitrogen, ammonia total [as N], weekly average4.3 mg/Ltighter2.37 mg/L (10 values, 2 below detection)0.551×

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/LA0043974 · MCP: https://passage-data.com/mcp