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Zionsville WWTP

Sewage treatment plant, major discharger, Zionsville, Indiana. NPDES permit IN0036951, in force until Dec 31, 2028. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (26 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026E. coli, colony forming units [CFU], daily maximum254.9 CFU/100mL≤ 235 CFU/100mL8%
August 2026E. coli, colony forming units [CFU], daily maximum3583 CFU/100mL≤ 235 CFU/100mL1425%

Limits in force (47)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 10 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 15 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 333.8 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 166.9 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 500.7 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 250.4 lb/dMay–Nov
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.9 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 21.7 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 31.7 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 31.7 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 48.4 lb/dJan, Feb, Mar, Apr, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (lb/d)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
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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJul
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteJun
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicJul
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronicJun
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJul
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteJun
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicJul
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronicJun
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 333.8 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 166.9 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 500.7 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 250.4 lb/dMay–Nov
Phosphorus, total percent removalmonthly average minimum≥ 75 %all 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/IN0036951 · MCP: https://passage-data.com/mcp