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St John the Baptist Parish - Wallace WWTP

Sewage treatment plant, Vacherie, Louisiana. NPDES permit LA0099759, in force until Feb 28, 2031. Last 12 months: over a limit 12 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (24 values), form Q quarterly (6 values), form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
19 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, total suspended, monthly average48 mg/L≤ 30 mg/L60%
December 2025Solids, total suspended, weekly average73 mg/L≤ 45 mg/L62%
January 2026Solids, total suspended, monthly average48 lb/d≤ 34 lb/d41%
January 2026Solids, total suspended, monthly average98 mg/L≤ 30 mg/L227%
January 2026Solids, total suspended, weekly average110 mg/L≤ 45 mg/L144%
February 2026Solids, total suspended, monthly average38.4 lb/d≤ 34 lb/d13%
February 2026Solids, total suspended, monthly average41 mg/L≤ 30 mg/L37%
February 2026Solids, total suspended, weekly average65 mg/L≤ 45 mg/L44%
May 2026BOD, 5-day, 20 deg. C, monthly average52.1 lb/d≤ 34 lb/d53%
May 2026Solids, total suspended, monthly average46.2 lb/d≤ 34 lb/d36%
June 2026Solids, total suspended, monthly average44.7 lb/d≤ 34 lb/d31%
July 2026Solids, total suspended, monthly average60.6 lb/d≤ 34 lb/d78%

Limits in force (36)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 34 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 34 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all 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≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 34 lb/dall year
Solids, total suspendedmonthly average≤ 34 lb/dall year
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
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
BOD, percent removal [total]monthly average minimum≥ 85 %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
Solids, suspended percent removalmonthly average minimum≥ 85 %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/LA0099759 · MCP: https://passage-data.com/mcp