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Lake Arthur, Town of

Sewage treatment plant, Lake Arthur, Louisiana. NPDES permit LA0020133, in force until Jul 14, 2028. Last 12 months: over a limit 25 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 59 days after each period: form A quarterly (16 values), form Q quarterly (6 values)
Renewal application due
Jan 16, 2028 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
25 values over a limit, 0 required values missing, 1 of 16 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, monthly average312 #/100mL≤ 200 #/100mL56%
October 2025Coliform, fecal general, weekly average2420 #/100mL≤ 400 #/100mL505%
October 2025Nitrogen, ammonia total [as N], monthly average< 2.97 mg/L≤ 2 mg/L48%
October 2025Nitrogen, ammonia total [as N], weekly average13.1 mg/L≤ 4 mg/L228%
October 2025Oxygen, dissolved [DO], monthly average minimum1.04 mg/L≥ 5 mg/L79%
November 2025Coliform, fecal general, monthly average324 #/100mL≤ 200 #/100mL62%
November 2025Coliform, fecal general, weekly average488 #/100mL≤ 400 #/100mL22%
November 2025Oxygen, dissolved [DO], monthly average minimum1.57 mg/L≥ 5 mg/L69%
December 2025Coliform, fecal general, monthly average> 69.83 #/100mL≤ 200 #/100mL—
December 2025Coliform, fecal general, weekly average> 2420 #/100mL≤ 400 #/100mL—
December 2025Oxygen, dissolved [DO], monthly average minimum2.92 mg/L≥ 5 mg/L42%
January 2026Coliform, fecal general, monthly average> 336.29 #/100mL≤ 200 #/100mL—
January 2026Coliform, fecal general, weekly average> 2420 #/100mL≤ 400 #/100mL—
January 2026Oxygen, dissolved [DO], monthly average minimum1.58 mg/L≥ 5 mg/L68%
February 2026Coliform, fecal general, monthly average> 354.9 #/100mL≤ 200 #/100mL—
February 2026Coliform, fecal general, weekly average> 2420 #/100mL≤ 400 #/100mL—
February 2026Oxygen, dissolved [DO], monthly average minimum.57 mg/L≥ 5 mg/L89%
March 2026BOD, carbonaceous [5 day, 20 C], weekly average18 mg/L≤ 15 mg/L20%
March 2026Coliform, fecal general, monthly average> 54.1 #/100mL≤ 200 #/100mL—
March 2026Coliform, fecal general, weekly average> 2420 #/100mL≤ 400 #/100mL—
March 2026Oxygen, dissolved [DO], monthly average minimum.67 mg/L≥ 5 mg/L87%
March 2026Solids, total suspended, weekly average52 mg/L≤ 45 mg/L16%
April 2026Oxygen, dissolved [DO], monthly average minimum1.6 mg/L≥ 5 mg/L68%
May 2026Oxygen, dissolved [DO], monthly average minimum.62 mg/L≥ 5 mg/L88%
June 2026Oxygen, dissolved [DO], monthly average minimum.04 mg/L≥ 5 mg/L99%

Limits in force (22)

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≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 188 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≤ 13 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 average≤ 200 #/100mLall year
Coliform, fecal generalweekly average≤ 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≤ 63 lb/dall year

New limits from Jul 15, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.3 mg/Ltighter0.153 mg/L (9 values, 6 below detection)—
Nitrogen, ammonia total [as N], monthly average8 lb/dtighter0.709 lb/d (9 values, 6 below detection)—
Nitrogen, ammonia total [as N], weekly average3 mg/Ltighter0.29 mg/L (9 values)0.0967×

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/LA0020133 · MCP: https://passage-data.com/mcp