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Magnolia Water Utility Operating Company LLC - Magnolia Park Service Subdivision

Sewerage Systems, Thibodaux, Louisiana. NPDES permit LA0066486, in force until Aug 31, 2031. Last 12 months: over a limit 7 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly, form Q quarterly, form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
28 values over a limit, 0 required values missing, 5 of 16 reports late

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

Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, daily maximum1840 #/100mL≤ 400 #/100mL360%
October 2025Coliform, fecal general, monthly geometric mean633 #/100mL≤ 200 #/100mL217%
October 2025Nitrogen, ammonia total [as N], daily maximum12 mg/L≤ 10 mg/L20%
October 2025Nitrogen, ammonia total [as N], monthly average11.4 mg/L≤ 5 mg/L128%
December 2025Nitrogen, ammonia total [as N], daily maximum12 mg/L≤ 10 mg/L20%
December 2025Nitrogen, ammonia total [as N], monthly average11.5 mg/L≤ 5 mg/L130%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum30 mg/L≤ 15 mg/L100%

Limits in force (42)

ParameterStatisticLimitMonths
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/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 23 mg/Lall year
Solids, total suspendeddaily maximum≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 28 lb/dall year
Solids, total suspendedmonthly average≤ 28 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport 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]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 9 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 9 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport 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 plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 19 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 19 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all 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/LA0066486 · MCP: https://passage-data.com/mcp