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ST. Leon WWTP

Sewage treatment plant, West Harrison, Indiana. NPDES permit IN0058408, in force until Oct 31, 2030. Last 12 months: over a limit 7 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, maximum weekly average47.7 mg/L≤ 45 mg/L6%
April 2026Nitrogen, ammonia total [as N], monthly average14.349 mg/L≤ 10.2 mg/L41%
April 2026Nitrogen, ammonia total [as N], maximum weekly average21.567 mg/L≤ 15.3 mg/L41%
May 2026Nitrogen, ammonia total [as N], monthly average14.959 mg/L≤ 10.2 mg/L47%
May 2026Nitrogen, ammonia total [as N], maximum weekly average20.82 mg/L≤ 15.3 mg/L36%
June 2026E. coli, colony forming units [CFU], daily maximum548 CFU/100mL≤ 235 CFU/100mL133%
June 2026Nitrogen, ammonia total [as N], maximum weekly average30.3 mg/L≤ 15.3 mg/L98%

Limits in force (18)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 143 lb/dall year
Solids, total suspendedmaximum weekly average≤ 214 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 10.2 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 15.3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 48.5 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 72.8 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 119 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 190 lb/dall year
Flow, totalmonthly totalreport only (Mgal/mo)all year

How strict are these limits?

Cited limits by parameter: Indiana'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/IN0058408 · MCP: https://passage-data.com/mcp