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West Ouachita Industrial District - West Ouachita Industrial Park STP

Sewage treatment plant, West Monroe, Louisiana. NPDES permit LA0038351, in force until Sep 30, 2027. Last 12 months: over a limit 5 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (16 values), form Q quarterly (8 values), form Y yearly
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average15.61 mg/L≤ 15 mg/L4%
December 2025Solids, total suspended, monthly average15.25 mg/L≤ 15 mg/L2%
March 2026Copper, total [as Cu], daily maximum.0086 lb/d≤ .006 lb/d43%
March 2026Copper, total [as Cu], monthly average.0086 lb/d≤ .0025 lb/d244%
September 2026Copper, total [as Cu], monthly average.0032 lb/d≤ .0025 lb/d28%

Limits in force (56)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 6 lb/dall 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≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 2 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
Arsenic, total [as As]monthly averagereport only (mg/L)all year
Arsenic, total [as As]daily maximumreport only (mg/L)all year
Arsenic, total [as As]monthly averagereport only (lb/d)all year
Arsenic, total [as As]daily maximumreport only (lb/d)all year
Cadmium, total [as Cd]monthly averagereport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]monthly averagereport only (lb/d)all year
Cadmium, total [as Cd]daily maximumreport only (lb/d)all year
Chromium, hexavalent [as Cr]monthly averagereport only (mg/L)all year
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year
Chromium, hexavalent [as Cr]monthly averagereport only (lb/d)all year
Chromium, hexavalent [as Cr]daily maximumreport only (lb/d)all year
Copper, total [as Cu]monthly average≤ .0025 lb/dall year
Copper, total [as Cu]daily maximum≤ .006 lb/dall year
Lead, total [as Pb]monthly averagereport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly averagereport only (lb/d)all year
Lead, total [as Pb]daily maximumreport only (lb/d)all year
Nickel, total [as Ni]monthly averagereport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]monthly averagereport only (lb/d)all year
Nickel, total [as Ni]daily maximumreport only (lb/d)all year
Zinc, total [as Zn]monthly averagereport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]monthly averagereport only (lb/d)all year
Zinc, total [as Zn]daily maximumreport only (lb/d)all year
Oil and greaseweekly average≤ 15 mg/Lall 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
Chromium IIImonthly averagereport only (mg/L)all year
Chromium IIIdaily maximumreport only (mg/L)all year
Chromium IIImonthly averagereport only (lb/d)all year
Chromium IIIdaily maximumreport only (lb/d)all year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)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≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4 lb/dall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0038351 · MCP: https://passage-data.com/mcp