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Dunkirk WWTP

Sewage treatment plant, Millgrove, Indiana. NPDES permit IN0021491, in force until Dec 31, 2028. Last 12 months: over a limit 21 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (31 values), form AQ quarterly (3 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 20 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chloride [as Cl], daily maximum738 mg/L≤ 690 mg/L7%
October 2025Chloride [as Cl], monthly average670.8 mg/L≤ 344 mg/L95%
November 2025Chloride [as Cl], daily maximum709 mg/L≤ 690 mg/L3%
November 2025Chloride [as Cl], monthly average632 mg/L≤ 344 mg/L84%
December 2025Chloride [as Cl], monthly average580 mg/L≤ 344 mg/L69%
January 2026Chloride [as Cl], monthly average501.5 mg/L≤ 344 mg/L46%
February 2026Chloride [as Cl], monthly average423 mg/L≤ 344 mg/L23%
February 2026Nitrogen, ammonia total [as N], monthly average12.46 lb/d≤ 12.3 lb/d1%
February 2026Nitrogen, ammonia total [as N], monthly average3.303 mg/L≤ 2.1 mg/L57%
February 2026Nitrogen, ammonia total [as N], maximum weekly average36.895 lb/d≤ 18.7 lb/d97%
February 2026Nitrogen, ammonia total [as N], maximum weekly average9.507 mg/L≤ 3.2 mg/L197%
March 2026Chloride [as Cl], monthly average496.4 mg/L≤ 344 mg/L44%
April 2026Chloride [as Cl], daily maximum704 mg/L≤ 690 mg/L2%
April 2026Chloride [as Cl], monthly average443 mg/L≤ 344 mg/L29%
May 2026Chloride [as Cl], monthly average456.8 mg/L≤ 344 mg/L33%
May 2026Solids, total suspended, maximum weekly average98.94 lb/d≤ 87.6 lb/d13%
June 2026Chloride [as Cl], daily maximum719 mg/L≤ 690 mg/L4%
June 2026Chloride [as Cl], monthly average653 mg/L≤ 344 mg/L90%
July 2026Chloride [as Cl], monthly average611 mg/L≤ 344 mg/L78%
July 2026Phosphorus, total [as P], monthly average1.02 mg/L≤ 1 mg/L2%
August 2026Solids, total suspended, maximum weekly average112.3 lb/d≤ 87.6 lb/d28%

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 18 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 10 mg/LMay–Nov001
Solids, total suspendedmaximum weekly average≤ 27 mg/LJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 15 mg/LMay–Nov001
Solids, total suspendedmonthly average≤ 105.1 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmonthly average≤ 58.4 lb/dMay–Nov001
Solids, total suspendedmaximum weekly average≤ 157.7 lb/dJan, Feb, Mar, Apr, Dec001
Solids, total suspendedmaximum weekly average≤ 87.6 lb/dMay–Nov001
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.2 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 3.2 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 8.8 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 12.3 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 12.9 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 18.7 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
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Chloride [as Cl]monthly average≤ 344 mg/Lall year001
Chloride [as Cl]daily maximum≤ 690 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
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
Chlorine, total residualmonthly average< .06 mg/LApr–Oct001
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct001
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct001
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct001
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)Dec001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Jan001
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acute (alert, not enforceable)Jan001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Dec001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Jan001
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1 tox chronic (alert, not enforceable)Jan001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Dec001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Jan001
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acute (alert, not enforceable)Jan001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Dec001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Jan001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox chronic (alert, not enforceable)Jan001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 27 mg/LJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LMay–Nov001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 105.1 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 58.4 lb/dMay–Nov001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 157.7 lb/dJan, Feb, Mar, Apr, Dec001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 87.6 lb/dMay–Nov001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Copper, 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
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
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

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/IN0021491 · MCP: https://passage-data.com/mcp