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Ligonier Wastewater Treatment Plant

Sewage treatment plant, major discharger, Ligonier, Indiana. NPDES permit IN0023582, in force until Feb 28, 2031. Last 12 months: over a limit 5 times (last July 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (36 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 1 required value missing, 4 of 20 reports late

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

Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, maximum weekly average319.6 mg/L≤ 45 mg/L610%
March 2026Silver total recoverable, daily maximum.00177 mg/L≤ .00052 mg/L240%
March 2026Silver total recoverable, monthly average.00051 mg/L≤ .00026 mg/L96%
July 2026Silver total recoverable, daily maximum.00071 mg/L≤ .00052 mg/L37%
July 2026Silver total recoverable, monthly average.00036 mg/L≤ .00026 mg/L38%

Limits in force (66)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 4 mg/LMay–Nov001
Oxygen, dissolved [DO]daily average minimum≥ 3 mg/LJan, Feb, Mar, Apr, Dec001
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≤ 1334 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 2002 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 294 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 311 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 587 lb/dMay–Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 623 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
Silver total recoverablemonthly average≤ .00026 mg/Lall year001
Silver total recoverabledaily maximum≤ .00052 mg/Lall year001
Silver total recoverablemonthly average≤ .0032 lb/dall year001
Silver total recoverabledaily maximum≤ .0065 lb/dall year001
Silver total recoverablemonthly averagereport only (mg/L)all year001
Silver total recoverabledaily maximumreport only (mg/L)all year001
Copper, total recoverablemonthly average≤ .038 mg/Lall year001
Copper, total recoverabledaily maximum≤ .076 mg/Lall year001
Copper, total recoverablemonthly average≤ .48 lb/dall year001
Copper, total recoverabledaily maximum≤ .95 lb/dall year001
Copper, total recoverablemonthly averagereport only (mg/L)all year001
Copper, total recoverabledaily maximumreport only (mg/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Feb001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Mar001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 5.5 tox chronic (alert, not enforceable)Feb001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 5.5 tox chronic (alert, not enforceable)Mar001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Feb001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Mar001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 5.5 tox chronic (alert, not enforceable)Feb001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 5.5 tox chronic (alert, not enforceable)Mar001
Mercury, total recoverableannual average≤ 6.7 ng/LFeb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec001
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≤ 1112 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1779 lb/dall year001
Phosphorus, total percent removalmonthly average minimum≥ 65 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Copper, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Cadmium, dry weightvaluereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Molybdenum, sludge, total, dry weight [as Mo]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Zinc, sludge, total, dry weight [as Zn]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Lead, sludge, total, dry weight [as Pb]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Nickel, sludge, total, dry weight [as Ni]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT
Mercury, sludge, total, dry weight [as Hg]valuereport only (mg/kg)Jun, DecPRT

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/IN0023582 · MCP: https://passage-data.com/mcp