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Marion, Town of

Sewage treatment plant, Marion, Louisiana. NPDES permit LA0043656, in force until Sep 30, 2028. Last 12 months: over a limit 9 times (last May 2026), 6 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A quarterly (12 values), outfall 001 form Q quarterly (6 values), outfall 01A form A quarterly (3 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 17 of 28 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average39.19 mg/L≤ 15 mg/L161%
October 2025Solids, total suspended, monthly average57.33 lb/d≤ 20 lb/d187%
October 2025Solids, total suspended, weekly average43 mg/L≤ 23 mg/L87%
March 2026Solids, total suspended, monthly average18.24 mg/L≤ 15 mg/L22%
March 2026Solids, total suspended, weekly average25 mg/L≤ 23 mg/L9%
April 2026Solids, total suspended, monthly average23.01 mg/L≤ 15 mg/L53%
April 2026Solids, total suspended, weekly average26 mg/L≤ 23 mg/L13%
May 2026Solids, total suspended, monthly average39.95 mg/L≤ 15 mg/L166%
May 2026Solids, total suspended, weekly average45 mg/L≤ 23 mg/L96%

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 20 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 plantweekly averagereport only (MGD)all year001
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13.3 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year01A
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year01A
Nitrogen, ammonia total [as N]monthly average≤ 6.7 lb/dall year01A

New limits from Oct 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average4.2 lb/dtighter0.28 lb/d (11 values)0.0667×
Nitrogen, ammonia total [as N], monthly average3.2 mg/Ltighter1 mg/L (11 values, 8 below detection)—
Nitrogen, ammonia total [as N], weekly average7.5 mg/Ltighter1 mg/L (11 values, 8 below detection)—

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/LA0043656 · MCP: https://passage-data.com/mcp