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Plainfield South WWTP, Town of

Sewage treatment plant, major discharger, Plainfield, Indiana. NPDES permit IN0062456, in force until Jan 31, 2031. Last 12 months: over a limit 4 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (31 values), form AQ quarterly (24 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chloride [as Cl], monthly average415 mg/L≤ 370 mg/L12%
January 2026Chloride [as Cl], monthly average402.5 mg/L≤ 370 mg/L9%
February 2026Chloride [as Cl], monthly average410 mg/L≤ 370 mg/L11%
April 2026Chloride [as Cl], monthly average382.5 mg/L≤ 370 mg/L3%

Limits in force (82)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov001
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 14 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 21 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 1000 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 470 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 1500 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 700 lb/dMay–Nov001
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≤ 1.5 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.5 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 50 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 100 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 77 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 150 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
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Chloride [as Cl]monthly average≤ 370 mg/Lall year001
Chloride [as Cl]daily maximum≤ 740 mg/Lall year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nickel, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Zinc, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Cadmium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Lead, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Chromium, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Copper, total recoverabledaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 18 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 830 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 400 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1300 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 600 lb/dMay–Nov001
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

New limits from Feb 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], monthly average360 mg/Ltighter367 mg/L (12 values)1.02×
Chloride [as Cl], daily maximum720 mg/Ltighter385 mg/L (12 values)0.535×

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/IN0062456 · MCP: https://passage-data.com/mcp