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Shelbyville WWTP, City of

Sewage treatment plant, major discharger, Shelbyville, Indiana. NPDES permit IN0032867, in force until Mar 31, 2031. Last 12 months: over a limit 2 times (last January 2026), 2 required values missing, 2 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form AQ quarterly, form TS twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 3 required values missing, 3 of 20 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, colony forming units [CFU], daily maximum388 CFU/100mL≤ 235 CFU/100mL65%
January 2026Phosphorus, total [as P], monthly average1.068 mg/L≤ 1 mg/L7%

Limits in force (54)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 4 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 24 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 36 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 2003 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 1602 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 3004 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 2403 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≤ 3.4 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 5.3 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 5.1 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 8 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 227 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 354 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 340 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 534 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
Lead, total recoverablemonthly averagereport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Lead, total recoverablemonthly averagereport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Copper, total recoverablemonthly averagereport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all 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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Mar, Sep
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Apr, Oct
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Apr, Oct
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.9 tox chronic (alert, not enforceable)Mar, Sep
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.9 tox chronic (alert, not enforceable)Apr, Oct
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.9 tox chronic (alert, not enforceable)Apr, Oct
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Mar, Sep
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Apr, Oct
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Apr, Oct
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.9 tox chronic (alert, not enforceable)Mar, Sep
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.9 tox chronic (alert, not enforceable)Apr, Oct
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.9 tox chronic (alert, not enforceable)Apr, Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 30 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1669 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1335 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 2670 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 2003 lb/dMay–Nov
Flow, totalmonthly totalreport only (Mgal/mo)all year

New limits from Apr 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Lead, total recoverable, daily maximum0.06 mg/Lnew0.0007 mg/L (7 values)0.0117×
Lead, total recoverable, monthly average0.03 mg/Lnew0.0006 mg/L (5 values)0.02×

How strict are these limits?

Cited limits by parameter: Indiana's rules and the federal ones.

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