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Magnolia Water Utility Operating Co., LLC

Sewerage Systems, Denham Springs, Louisiana. NPDES permit LA0126136, in force until Apr 30, 2029. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (10 values), outfall 001 form Q quarterly (12 values), outfall 101 form A quarterly (28 values), outfall 102 form A quarterly (28 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 40 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum24 mg/L≤ 15 mg/L60%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%

Limits in force (78)

ParameterStatisticLimitMonthsOutfall
Solids, total suspendedmonthly average≤ 17.5 lb/dall year001
Solids, total suspendedmonthly average≤ 17.5 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
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dall 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
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]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 plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (lb/d)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11.7 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11.7 lb/dall year001
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year101
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year101
pHinstantaneous minimum≥ 6 SUall year101
pHinstantaneous minimum≥ 6 SUall year101
pHinstantaneous maximum≤ 9 SUall year101
pHinstantaneous maximum≤ 9 SUall year101
Solids, total suspendedmonthly average≤ 15 mg/Lall year101
Solids, total suspendedmonthly average≤ 15 mg/Lall year101
Solids, total suspendeddaily maximum≤ 23 mg/Lall year101
Solids, total suspendeddaily maximum≤ 23 mg/Lall year101
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year101
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year101
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year101
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year101
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year101
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year101
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year101
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year101
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year101
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year101
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year102
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year102
pHinstantaneous minimum≥ 6 SUall year102
pHinstantaneous minimum≥ 6 SUall year102
pHinstantaneous maximum≤ 9 SUall year102
pHinstantaneous maximum≤ 9 SUall year102
Solids, total suspendedmonthly average≤ 15 mg/Lall year102
Solids, total suspendedmonthly average≤ 15 mg/Lall year102
Solids, total suspendeddaily maximum≤ 23 mg/Lall year102
Solids, total suspendeddaily maximum≤ 23 mg/Lall year102
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year102
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year102
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year102
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/Lall year102
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year102
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year102
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year102
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year102
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year102
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year102
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year102
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year102
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year102
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year102
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year102
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year102
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year102
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year102

New limits from May 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum outfall 1010.044 mg/Lnew5.5 mg/L (9 values)125×
Chlorine, total residual, instantaneous maximum outfall 1020.044 mg/Lnew5.7 mg/L (9 values)130×

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/LA0126136 · MCP: https://passage-data.com/mcp