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Ridgeville WWTP

Sewage treatment plant, Ridgeville, Indiana. NPDES permit IN0020001, in force until Feb 28, 2029. Last 12 months: over a limit 3 times (last August 2026), 1 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (25 values), outfall 004 form CP monthly (13 values), outfall 101 form C monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
May 2026E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
May 2026E. coli, colony forming units [CFU], monthly geometric mean2420 CFU/100mL≤ 125 CFU/100mL1836%
August 2026E. coli, colony forming units [CFU], daily maximum2419.6 CFU/100mL≤ 235 CFU/100mL930%

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 75.1 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 112.7 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3.3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 4.4 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 5 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 6.6 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 8.3 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 12.5 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 16.5 lb/dJan, Feb, Mar, Apr, Dec001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualmonthly average< .06 mg/LApr–Oct001
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct001
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct001
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct001
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62.6 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 100.1 lb/dall year001
Phosphorus, total percent removalmonthly average minimumreport only (%)all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
pHdaily minimumreport only (SU)all year004
pHdaily maximumreport only (SU)all year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Chlorine, total residualmonthly average< .06 mg/LApr–Oct004
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct004
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct004
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct004
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year004
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year004
Flow, totalmonthly totalreport only (Mgal/mo)all year004
Durationmonthly totalreport only (hr/mo)all year101
Overflow volume [SS0 volume, CSO volume]monthly totalreport only (Mgal)all year101
Precipitation, monthly accumulationmonthly totalreport only (in/mo)all year101
Discharge event observation [Visual Monitoring]monthly totalreport only (#/mo)all year101

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/IN0020001 · MCP: https://passage-data.com/mcp