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Magnolia Water Utility Operating Company LLC - Avies Knoll Subdivision

Sewerage Systems, Lafayette, Louisiana. NPDES permit LA0074951, in force until Sep 30, 2030. Last 12 months: over a limit 10 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Q quarterly (4 values), form A quarterly, form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
41 values over a limit, 0 required values missing, 0 of 40 reports late

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

Period endingParameterReportedLimitOver by
March 2026Chlorine, total residual, instantaneous maximum3.8 mg/L≤ .033 mg/L11415%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average24 mg/L≤ 20 mg/L20%
April 2026Chlorine, total residual, instantaneous maximum3.6 mg/L≤ .033 mg/L10809%
April 2026Nitrogen, ammonia total [as N], monthly average18.58 mg/L≤ 10 mg/L86%
April 2026Oxygen, dissolved [DO], monthly average minimum4 mg/L≥ 5 mg/L20%
May 2026Chlorine, total residual, instantaneous maximum3.7 mg/L≤ .033 mg/L11112%
May 2026Nitrogen, ammonia total [as N], monthly average6.5 mg/L≤ 5 mg/L30%
June 2026Chlorine, total residual, instantaneous maximum3.7 mg/L≤ .033 mg/L11112%
June 2026Nitrogen, ammonia total [as N], monthly average6.88 mg/L≤ 5 mg/L38%
June 2026Solids, total suspended, monthly average16 mg/L≤ 15 mg/L7%

Limits in force (36)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LMay–Dec
Solids, total suspendedmonthly average≤ 20 mg/LJan–Apr
Solids, total suspendeddaily maximum≤ 23 mg/LMay–Dec
Solids, total suspendeddaily maximum≤ 30 mg/LJan–Apr
Solids, total suspendedmonthly average≤ 16 lb/dMay–Dec
Solids, total suspendedmonthly average≤ 22 lb/dJan–Apr
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, ammonia total [as N]monthly average≤ 5 mg/LMay–Dec
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan–Apr
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMay–Dec
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan–Apr
Nitrogen, ammonia total [as N]monthly average≤ 5 lb/dMay–Dec
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dJan–Apr
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)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
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/LMay–Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LJan–Apr
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11 lb/dMay–Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 22 lb/dJan–Apr
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/LA0074951 · MCP: https://passage-data.com/mcp