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Magnolia Water Utility Operating Co., LLC

Sewerage Systems, Prairieville, Louisiana. NPDES permit LA0081418, in force until Jul 31, 2028. Last 12 months: over a limit 24 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (26 values), outfall 001 form Q quarterly (6 values), outfall 01A form A quarterly (6 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
22 values over a limit, 0 required values missing, 0 of 28 reports late

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

All 24 values over a limit
Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, daily maximum32 mg/L≤ 23 mg/L39%
November 2025Solids, total suspended, monthly average22 mg/L≤ 15 mg/L47%
December 2025Solids, total suspended, daily maximum52 mg/L≤ 23 mg/L126%
December 2025Solids, total suspended, monthly average40 mg/L≤ 15 mg/L167%
January 2026Solids, total suspended, daily maximum43 mg/L≤ 23 mg/L87%
January 2026Solids, total suspended, monthly average33 mg/L≤ 15 mg/L120%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum30 mg/L≤ 15 mg/L100%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average16 mg/L≤ 10 mg/L60%
February 2026Solids, total suspended, daily maximum58 mg/L≤ 23 mg/L152%
February 2026Solids, total suspended, monthly average35 mg/L≤ 15 mg/L133%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum81 mg/L≤ 15 mg/L440%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average57 mg/L≤ 10 mg/L470%
March 2026Solids, total suspended, daily maximum52 mg/L≤ 23 mg/L126%
March 2026Solids, total suspended, monthly average39 mg/L≤ 15 mg/L160%
April 2026Solids, total suspended, monthly average21 mg/L≤ 15 mg/L40%
May 2026BOD, carbonaceous [5 day, 20 C], daily maximum16 mg/L≤ 15 mg/L7%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average16 mg/L≤ 10 mg/L60%
May 2026Solids, total suspended, daily maximum68 mg/L≤ 23 mg/L196%
May 2026Solids, total suspended, monthly average68 mg/L≤ 15 mg/L353%
May 2026pH, instantaneous maximum9.59 SU≤ 9 SU—
June 2026BOD, carbonaceous [5 day, 20 C], monthly average11 mg/L≤ 10 mg/L10%
June 2026Solids, total suspended, daily maximum43 mg/L≤ 23 mg/L87%
June 2026Solids, total suspended, monthly average40 mg/L≤ 15 mg/L167%
June 2026Solids, total suspended, monthly average68.1 lb/d≤ 38 lb/d79%

Limits in force (38)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendeddaily maximum≤ 23 mg/Lall year001
Solids, total suspendeddaily maximum≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 38 lb/dall year001
Solids, total suspendedmonthly average≤ 38 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
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
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
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year01A
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year01A
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year01A
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year01A
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year01A
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year01A

New limits from Aug 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], daily maximum4 mg/Lnew0.47 mg/L (9 values)0.117×
Nitrogen, ammonia total [as N], monthly average4.2 lb/dnew0.097 lb/d (9 values, 3 below detection)0.0231×
Nitrogen, ammonia total [as N], monthly average1.7 mg/Lnew0.28 mg/L (9 values, 3 below detection)0.165×

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/LA0081418 · MCP: https://passage-data.com/mcp