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Westport WWTP

Sewage treatment plant, Westport, Indiana. NPDES permit IN0024830, in force until Mar 31, 2031. Last 12 months: over a limit 3 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Dilution factor, daily maximum.3793 Ratio≤ .1 Ratio279%
June 2026Dilution factor, daily maximum.1205 Ratio≤ .1 Ratio21%
August 2026Dilution factor, daily maximum.2542 Ratio≤ .1 Ratio154%

Limits in force (21)

ParameterStatisticLimitMonths
Streamflowmonthly averagereport only (MGD)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 70 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 105 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 9.5 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 12.1 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 14.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 18.2 mg/LJan, Feb, Mar, Apr, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average< .06 mg/LApr–Oct
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year
Dilution factordaily maximum≤ .1 Ratioall year
Flow, totalmonthly totalreport only (Mgal/mo)all year

New limits from Dec 1, 2026

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average3.2 mg/L (Jan, Feb, Mar, Apr, Dec)tighter9.023 mg/L (3 values)2.82×
Nitrogen, ammonia total [as N], monthly average1.6 mg/L (May–Nov)tighter3.645 mg/L (4 values)2.28×
Nitrogen, ammonia total [as N], maximum weekly average4.8 mg/L (Jan, Feb, Mar, Apr, Dec)tighter11.4 mg/L (3 values)2.38×
Nitrogen, ammonia total [as N], maximum weekly average2.4 mg/L (May–Nov)tighter4.065 mg/L (4 values)1.69×

How strict are these limits?

Cited limits by parameter: Indiana'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/IN0024830 · MCP: https://passage-data.com/mcp