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Zwolle Town of - Municipal Wastewater Facility

Sewage treatment plant, Zwolle, Louisiana. NPDES permit LA0020354, in force until Feb 28, 2031. Last 12 months: over a limit 20 times (last June 2026), 4 required values missing, 6 of 13 reports late. 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
July 2026
Oct 2024 – Sep 2025
22 values over a limit, 82 required values missing, 14 of 16 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, monthly average28.12 mg/L≤ 15 mg/L87%
November 2025Solids, total suspended, weekly average38 mg/L≤ 23 mg/L65%
December 2025Solids, total suspended, monthly average25.98 mg/L≤ 15 mg/L73%
December 2025Solids, total suspended, weekly average34 mg/L≤ 23 mg/L48%
January 2026BOD, 5-day, 20 deg. C, weekly average15.51 mg/L≤ 15 mg/L3%
January 2026Coliform, fecal general, weekly average780 #/100mL≤ 400 #/100mL95%
January 2026Solids, total suspended, monthly average23.08 mg/L≤ 15 mg/L54%
January 2026Solids, total suspended, weekly average26 mg/L≤ 23 mg/L13%
February 2026BOD, 5-day, 20 deg. C, monthly average11.45 mg/L≤ 10 mg/L15%
February 2026Solids, total suspended, monthly average17.63 mg/L≤ 15 mg/L18%
February 2026Solids, total suspended, weekly average24 mg/L≤ 23 mg/L4%
March 2026Solids, total suspended, monthly average22.42 mg/L≤ 15 mg/L49%
March 2026Solids, total suspended, weekly average33 mg/L≤ 23 mg/L43%
April 2026Solids, total suspended, monthly average25.44 mg/L≤ 15 mg/L70%
April 2026Solids, total suspended, weekly average45 mg/L≤ 23 mg/L96%
May 2026Solids, total suspended, monthly average16.09 mg/L≤ 15 mg/L7%
June 2026BOD, 5-day, 20 deg. C, monthly average10.31 mg/L≤ 10 mg/L3%
June 2026BOD, 5-day, 20 deg. C, monthly average784.18 lb/d≤ 67 lb/d1070%
June 2026Solids, total suspended, monthly average907.28 lb/d≤ 100 lb/d807%
June 2026pH, instantaneous maximum9.3 SU≤ 9 SU—

Limits in force (38)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 67 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 67 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 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≤ 100 lb/dall year
Solids, total suspendedmonthly average≤ 100 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 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 maximumreport only (mg/L)all year
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year
BOD, percent removal [total]monthly average minimum≥ 85 %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
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

New limits from Mar 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, instantaneous maximum0.033 mg/Lnew——

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/LA0020354 · MCP: https://passage-data.com/mcp