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Town of Mamou

Sewage treatment plant, Mamou, Louisiana. NPDES permit LA0020125, in force until Sep 30, 2028. Last 12 months: over a limit 33 times (last July 2026), 1 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (16 values), form Q quarterly (6 values), form Y yearly
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
July 2026
Oct 2024 – Sep 2025
32 values over a limit, 0 required values missing, 3 of 17 reports late

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

All 33 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average23.03 lb/d≤ 10 lb/d130%
October 2025Nitrogen, ammonia total [as N], monthly average9.56 mg/L≤ 2 mg/L378%
October 2025Nitrogen, ammonia total [as N], weekly average18.6 mg/L≤ 4 mg/L365%
November 2025Nitrogen, ammonia total [as N], monthly average14.59 lb/d≤ 10 lb/d46%
November 2025Nitrogen, ammonia total [as N], monthly average7.83 mg/L≤ 2 mg/L292%
November 2025Nitrogen, ammonia total [as N], weekly average10.4 mg/L≤ 4 mg/L160%
December 2025Nitrogen, ammonia total [as N], monthly average12.98 mg/L≤ 2 mg/L549%
December 2025Nitrogen, ammonia total [as N], monthly average47.67 lb/d≤ 10 lb/d377%
December 2025Nitrogen, ammonia total [as N], weekly average15.7 mg/L≤ 4 mg/L293%
January 2026Nitrogen, ammonia total [as N], monthly average12.59 mg/L≤ 2 mg/L530%
January 2026Nitrogen, ammonia total [as N], monthly average43.7 lb/d≤ 10 lb/d337%
January 2026Nitrogen, ammonia total [as N], weekly average18.3 mg/L≤ 4 mg/L358%
February 2026Nitrogen, ammonia total [as N], monthly average15.4 mg/L≤ 2 mg/L670%
February 2026Nitrogen, ammonia total [as N], monthly average49.68 lb/d≤ 10 lb/d397%
February 2026Nitrogen, ammonia total [as N], weekly average18.5 mg/L≤ 4 mg/L363%
March 2026Nitrogen, ammonia total [as N], monthly average15.3 mg/L≤ 2 mg/L665%
March 2026Nitrogen, ammonia total [as N], monthly average53.74 lb/d≤ 10 lb/d437%
March 2026Nitrogen, ammonia total [as N], weekly average18.9 mg/L≤ 4 mg/L373%
April 2026Nitrogen, ammonia total [as N], monthly average13.97 mg/L≤ 2 mg/L599%
April 2026Nitrogen, ammonia total [as N], monthly average31.88 lb/d≤ 10 lb/d219%
April 2026Nitrogen, ammonia total [as N], weekly average20.1 mg/L≤ 4 mg/L403%
May 2026Coliform, fecal general, weekly geometric mean450 #/100mL≤ 400 #/100mL13%
May 2026Nitrogen, ammonia total [as N], monthly average36.86 lb/d≤ 10 lb/d269%
May 2026Nitrogen, ammonia total [as N], monthly average7.88 mg/L≤ 2 mg/L294%
May 2026Nitrogen, ammonia total [as N], weekly average15 mg/L≤ 4 mg/L275%
May 2026Solids, total suspended, monthly average15.7 mg/L≤ 15 mg/L5%
May 2026Solids, total suspended, weekly average24 mg/L≤ 23 mg/L4%
June 2026Nitrogen, ammonia total [as N], monthly average16.47 mg/L≤ 2 mg/L724%
June 2026Nitrogen, ammonia total [as N], monthly average85.42 lb/d≤ 10 lb/d754%
June 2026Nitrogen, ammonia total [as N], weekly average19.3 mg/L≤ 4 mg/L383%
July 2026Nitrogen, ammonia total [as N], monthly average11.67 mg/L≤ 2 mg/L484%
July 2026Nitrogen, ammonia total [as N], monthly average41.43 lb/d≤ 10 lb/d314%
July 2026Nitrogen, ammonia total [as N], weekly average14.2 mg/L≤ 4 mg/L255%

Limits in force (25)

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/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 75 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 10 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport 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 plantweekly averagereport only (MGD)all year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]weekly averagereport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 50 lb/dall 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/LA0020125 · MCP: https://passage-data.com/mcp