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Sewerage District #1 of Tangipahoa Parish - Southwest Regional STF

Sewage treatment plant, Hammond, Louisiana. NPDES permit LA0126501, in force until Sep 30, 2028. Last 12 months: over a limit 15 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
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
June 2026
Oct 2024 – Sep 2025
20 values over a limit, 3 required values missing, 0 of 29 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, carbonaceous [5 day, 20 C], monthly average13 mg/L≤ 10 mg/L30%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average16.91 lb/d≤ 15 lb/d13%
December 2025Coliform, fecal general, monthly geometric mean1210 #/100mL≤ 200 #/100mL505%
December 2025Coliform, fecal general, weekly geometric mean2419 #/100mL≤ 400 #/100mL505%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average11 mg/L≤ 10 mg/L10%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average10.5 mg/L≤ 10 mg/L5%
February 2026Solids, total suspended, monthly average23.5 mg/L≤ 15 mg/L57%
February 2026Solids, total suspended, weekly average26 mg/L≤ 23 mg/L13%
March 2026Coliform, fecal general, monthly geometric mean463 #/100mL≤ 200 #/100mL132%
March 2026Coliform, fecal general, weekly geometric mean770 #/100mL≤ 400 #/100mL93%
April 2026Coliform, fecal general, monthly geometric mean850 #/100mL≤ 200 #/100mL325%
April 2026Coliform, fecal general, weekly geometric mean1410 #/100mL≤ 400 #/100mL253%
May 2026Coliform, fecal general, monthly geometric mean2420 #/100mL≤ 200 #/100mL1110%
May 2026Coliform, fecal general, weekly geometric mean2420 #/100mL≤ 400 #/100mL505%
June 2026Coliform, fecal general, monthly geometric mean387 #/100mL≤ 200 #/100mL94%

Limits in force (56)

ParameterStatisticLimitMonths
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/Lall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 22.5 lb/dall year
Solids, total suspendedmonthly average≤ 22.5 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]daily maximumreport 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/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3 lb/dApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3 lb/dApr–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport 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 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
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Chlorine, total residualinstantaneous maximum≤ .033 mg/Lall year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolvedweekly averagereport only (mg/L)all year
Solids, total dissolvedweekly averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolvedmonthly averagereport only (lb/d)all year
Solids, total dissolvedmonthly averagereport only (lb/d)all year
Solids, total dissolvedmonthly averagereport only (lb/d)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 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/Lall 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]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 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/LA0126501 · MCP: https://passage-data.com/mcp