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Warren WWTP

Sewage treatment plant, Warren, Indiana. NPDES permit IN0024791, in force until May 31, 2030. Last 12 months: over a limit 5 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 7 required values missing, 1 of 16 reports late

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

Period endingParameterReportedLimitOver by
May 2026Phosphorus, total percent removal, monthly average minimum69.1 %≥ 70 %3%
June 2026Phosphorus, total [as P], monthly average1.433 mg/L≤ 1 mg/L43%
June 2026Phosphorus, total percent removal, monthly average minimum65.7 %≥ 70 %14%
July 2026Phosphorus, total [as P], monthly average1.37 mg/L≤ 1 mg/L37%
July 2026Phosphorus, total percent removal, monthly average minimum65.7 %≥ 70 %14%

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 4 mg/Lall year001
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≤ 150 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 225 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 4.7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 5.4 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 7 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 18 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 23.5 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 27 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 35 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
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 acuteDec001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteNov001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 2.7 tox chronicDec001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 2.7 tox chronicNov001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteDec001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteNov001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 2.7 tox chronicDec001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 2.7 tox chronicNov001
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≤ 125 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 200 lb/dall year001
Phosphorus, total percent removalmonthly average minimum≥ 70 %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

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0024791 · MCP: https://passage-data.com/mcp