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ST. Martin Parish Government

Sewage treatment plant, Cecilia, Louisiana. NPDES permit LA0111457, in force until Dec 14, 2027. Last 12 months: over a limit 12 times (last June 2026), 13 required values missing, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form A quarterly (26 values), form Q quarterly (4 values)
Renewal application due
Jun 17, 2027 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average11.3 mg/L≤ 2 mg/L465%
October 2025Nitrogen, ammonia total [as N], weekly average11.3 mg/L≤ 4 mg/L183%
April 2026Nitrogen, ammonia total [as N], monthly average3.77 mg/L≤ 2 mg/L89%
May 2026Coliform, fecal general, monthly geometric mean> 2419.6 #/100mL≤ 200 #/100mL—
May 2026Coliform, fecal general, weekly geometric mean> 2419.6 #/100mL≤ 400 #/100mL—
May 2026Nitrogen, ammonia total [as N], monthly average2.05 mg/L≤ 2 mg/L3%
May 2026Solids, total suspended, monthly average91 mg/L≤ 15 mg/L507%
May 2026Solids, total suspended, weekly average91 mg/L≤ 23 mg/L296%
June 2026Coliform, fecal general, monthly geometric mean1553.1 #/100mL≤ 200 #/100mL677%
June 2026Coliform, fecal general, weekly geometric mean1553.1 #/100mL≤ 400 #/100mL288%
June 2026Nitrogen, ammonia total [as N], monthly average4.08 mg/L≤ 2 mg/L104%
June 2026Nitrogen, ammonia total [as N], weekly average4.08 mg/L≤ 4 mg/L2%

Limits in force (42)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LApr–Oct
Solids, total suspendedmonthly average≤ 15 mg/LApr–Oct
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedweekly average≤ 23 mg/LApr–Oct
Solids, total suspendedweekly average≤ 23 mg/LApr–Oct
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedweekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
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≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LApr–Oct
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 plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly 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 generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec

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/LA0111457 · MCP: https://passage-data.com/mcp