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Harahan City of - City of Harahan WWTP

Sewage treatment plant, major discharger, Harahan, Louisiana. NPDES permit LA0043940, in force until Jan 31, 2031. Last 12 months: over a limit 70 times (last August 2026), 13 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (13 values), form DA yearly, form PI yearly, form Q quarterly, form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
42 values over a limit, 0 required values missing, 5 of 19 reports late

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

All 70 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average402 lb/d≤ 400 lb/d1%
October 2025BOD, 5-day, 20 deg. C, monthly average53 mg/L≤ 30 mg/L77%
October 2025BOD, 5-day, 20 deg. C, weekly average92 mg/L≤ 45 mg/L104%
October 2025Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
October 2025Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
October 2025Solids, total suspended, monthly average36 mg/L≤ 30 mg/L20%
November 2025BOD, 5-day, 20 deg. C, monthly average53 mg/L≤ 30 mg/L77%
November 2025BOD, 5-day, 20 deg. C, weekly average84 mg/L≤ 45 mg/L87%
November 2025Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
November 2025Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
November 2025Solids, total suspended, monthly average42 mg/L≤ 30 mg/L40%
November 2025Solids, total suspended, weekly average100 mg/L≤ 45 mg/L122%
December 2025BOD, 5-day, 20 deg. C, monthly average35 mg/L≤ 30 mg/L17%
December 2025Coliform, fecal general, monthly geometric mean970 #/100mL≤ 200 #/100mL385%
December 2025Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
December 2025Solids, total suspended, monthly average51 mg/L≤ 30 mg/L70%
December 2025Solids, total suspended, weekly average73 mg/L≤ 45 mg/L62%
January 2026BOD, 5-day, 20 deg. C, monthly average39 mg/L≤ 30 mg/L30%
January 2026BOD, 5-day, 20 deg. C, weekly average51 mg/L≤ 45 mg/L13%
January 2026Coliform, fecal general, monthly geometric mean266 #/100mL≤ 200 #/100mL33%
January 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
January 2026Solids, total suspended, monthly average531 lb/d≤ 400 lb/d33%
January 2026Solids, total suspended, monthly average54 mg/L≤ 30 mg/L80%
January 2026Solids, total suspended, weekly average63 mg/L≤ 45 mg/L40%
February 2026BOD, 5-day, 20 deg. C, monthly average42 mg/L≤ 30 mg/L40%
February 2026BOD, 5-day, 20 deg. C, weekly average80 mg/L≤ 45 mg/L78%
February 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
February 2026Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
February 2026Solids, total suspended, weekly average55 mg/L≤ 45 mg/L22%
March 2026BOD, 5-day, 20 deg. C, monthly average606 lb/d≤ 400 lb/d52%
March 2026BOD, 5-day, 20 deg. C, monthly average67 mg/L≤ 30 mg/L123%
March 2026BOD, 5-day, 20 deg. C, weekly average104 mg/L≤ 45 mg/L131%
March 2026BOD, percent removal [total], monthly average minimum68 %≥ 85 %113%
March 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
March 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
March 2026Solids, suspended percent removal, monthly average minimum73 %≥ 85 %80%
March 2026Solids, total suspended, monthly average100 mg/L≤ 30 mg/L233%
March 2026Solids, total suspended, monthly average866 lb/d≤ 400 lb/d117%
March 2026Solids, total suspended, weekly average183 mg/L≤ 45 mg/L307%
April 2026BOD, 5-day, 20 deg. C, monthly average39 mg/L≤ 30 mg/L30%
April 2026BOD, 5-day, 20 deg. C, weekly average51 mg/L≤ 45 mg/L13%
April 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
April 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
April 2026Solids, total suspended, monthly average433 lb/d≤ 400 lb/d8%
April 2026Solids, total suspended, monthly average56 mg/L≤ 30 mg/L87%
April 2026Solids, total suspended, weekly average96 mg/L≤ 45 mg/L113%
May 2026BOD, 5-day, 20 deg. C, monthly average448 lb/d≤ 400 lb/d12%
May 2026BOD, 5-day, 20 deg. C, weekly average56 mg/L≤ 45 mg/L24%
May 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
May 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
May 2026Solids, total suspended, monthly average33 mg/L≤ 30 mg/L10%
May 2026Solids, total suspended, monthly average470 lb/d≤ 400 lb/d18%
June 2026BOD, 5-day, 20 deg. C, monthly average58 mg/L≤ 30 mg/L93%
June 2026BOD, 5-day, 20 deg. C, monthly average684 lb/d≤ 400 lb/d71%
June 2026BOD, 5-day, 20 deg. C, weekly average113 mg/L≤ 45 mg/L151%
June 2026BOD, percent removal [total], monthly average minimum44 %≥ 85 %273%
June 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
June 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
June 2026Solids, suspended percent removal, monthly average minimum79 %≥ 85 %40%
July 2026BOD, 5-day, 20 deg. C, monthly average48 mg/L≤ 30 mg/L60%
July 2026BOD, 5-day, 20 deg. C, monthly average540 lb/d≤ 400 lb/d35%
July 2026BOD, 5-day, 20 deg. C, weekly average73 mg/L≤ 45 mg/L62%
July 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
July 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
August 2026BOD, 5-day, 20 deg. C, monthly average104 mg/L≤ 30 mg/L247%
August 2026BOD, 5-day, 20 deg. C, monthly average1058 lb/d≤ 400 lb/d165%
August 2026BOD, 5-day, 20 deg. C, weekly average121 mg/L≤ 45 mg/L169%
August 2026Coliform, fecal general, monthly geometric mean1000 #/100mL≤ 200 #/100mL400%
August 2026Coliform, fecal general, weekly geometric mean1000 #/100mL≤ 400 #/100mL150%
August 2026Solids, total suspended, monthly average38 mg/L≤ 30 mg/L27%

Limits in force (36)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 400 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all 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≤ 400 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
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
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
BOD, percent removal [total]monthly average minimum≥ 85 %all year
Priority pollutants scan [yes/no]minimum≥ 1 N=0;Y=1all year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all year
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all year
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all year
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all year
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all year
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all year
Coef Of Var Static Renewal 48Hr Acute D. pulexmaximumreport only (%)all year
Coef Of Var Static Renewal 48Hr Acute Pimephales promelasmaximumreport only (%)all year

Cited limits by parameter: Louisiana's rules and the federal ones.

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