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Markle WWTP

Sewage treatment plant, Markle, Indiana. NPDES permit IN0023736, in force until Feb 28, 2030. Last 12 months: no values over a limit, 1 of 18 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (22 values), form AQ quarterly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 12 required values missing, 3 of 20 reports late

Limits in force (60)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 18 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 27 mg/Lall year001
Solids, total suspendedmonthly average≤ 68 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 101 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 7.4 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.5 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 11.1 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 11.3 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 27.8 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 16.9 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 41.7 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
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
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 acuteFeb001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMar001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMar001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3 tox chronicFeb001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3 tox chronicMar001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 3 tox chronicMar001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteFeb001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMar001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMar001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3 tox chronicFeb001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3 tox chronicMar001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 3 tox chronicMar001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 23 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 56 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 86 lb/dall year001
Phosphorus, total percent removalmonthly average minimum≥ 80 %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/IN0023736 · MCP: https://passage-data.com/mcp