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Mermentau Village of - STP

Sewage treatment plant, Mermentau, Louisiana. NPDES permit LA0049271, in force until Mar 31, 2031. Last 12 months: over a limit 48 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly, form Q quarterly, form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
40 values over a limit, 0 required values missing, 4 of 16 reports late

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

All 48 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, monthly geometric mean1849.4 #/100mL≤ 200 #/100mL825%
October 2025Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
November 2025Coliform, fecal general, monthly geometric mean2047.7 #/100mL≤ 200 #/100mL924%
November 2025Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
November 2025Solids, total suspended, monthly average29 mg/L≤ 15 mg/L93%
November 2025Solids, total suspended, weekly average30 mg/L≤ 23 mg/L30%
December 2025Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
December 2025Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
December 2025Solids, total suspended, monthly average17.3 lb/d≤ 13 lb/d33%
December 2025Solids, total suspended, monthly average44 mg/L≤ 15 mg/L193%
December 2025Solids, total suspended, weekly average44 mg/L≤ 23 mg/L91%
January 2026Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
January 2026Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
January 2026Solids, total suspended, monthly average37 mg/L≤ 15 mg/L147%
January 2026Solids, total suspended, weekly average51 mg/L≤ 23 mg/L122%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average10 lb/d≤ 8 lb/d25%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average17 mg/L≤ 10 mg/L70%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average23 mg/L≤ 15 mg/L53%
February 2026Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
February 2026Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
February 2026Nitrogen, ammonia total [as N], monthly average12.1 lb/d≤ 8 lb/d51%
February 2026Nitrogen, ammonia total [as N], monthly average20.4 mg/L≤ 10 mg/L104%
February 2026Nitrogen, ammonia total [as N], weekly average22 mg/L≤ 20 mg/L10%
February 2026Solids, total suspended, monthly average25 lb/d≤ 13 lb/d92%
February 2026Solids, total suspended, monthly average42 mg/L≤ 15 mg/L180%
February 2026Solids, total suspended, weekly average47 mg/L≤ 23 mg/L104%
March 2026Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
March 2026Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
March 2026Solids, total suspended, monthly average18.7 lb/d≤ 13 lb/d44%
March 2026Solids, total suspended, monthly average48 mg/L≤ 15 mg/L220%
March 2026Solids, total suspended, weekly average78 mg/L≤ 23 mg/L239%
April 2026Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
April 2026Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
April 2026Nitrogen, ammonia total [as N], monthly average10.9 mg/L≤ 10 mg/L9%
April 2026Solids, total suspended, monthly average17.3 lb/d≤ 13 lb/d33%
April 2026Solids, total suspended, monthly average48 mg/L≤ 15 mg/L220%
April 2026Solids, total suspended, weekly average52 mg/L≤ 23 mg/L126%
May 2026Coliform, fecal general, monthly geometric mean2192.3 #/100mL≤ 200 #/100mL996%
May 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
May 2026Solids, total suspended, monthly average42 mg/L≤ 15 mg/L180%
May 2026Solids, total suspended, weekly average63 mg/L≤ 23 mg/L174%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
June 2026BOD, carbonaceous [5 day, 20 C], weekly average16 mg/L≤ 15 mg/L7%
June 2026Coliform, fecal general, monthly geometric mean2419.6 #/100mL≤ 200 #/100mL1110%
June 2026Coliform, fecal general, weekly geometric mean2419.6 #/100mL≤ 400 #/100mL505%
June 2026Solids, total suspended, monthly average27.3 lb/d≤ 13 lb/d110%
June 2026Solids, total suspended, monthly average50 mg/L≤ 15 mg/L233%
June 2026Solids, total suspended, weekly average57 mg/L≤ 23 mg/L148%

Limits in force (27)

ParameterStatisticLimitMonths
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≤ 13 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all 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≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 8 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
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≤ 8 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]weekly averagereport 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/LA0049271 · MCP: https://passage-data.com/mcp