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Colfax WWTP, Town of

Sewage treatment plant, Colfax, Indiana. NPDES permit IN0020443, in force until Dec 31, 2027. Last 12 months: over a limit 24 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (23 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 24 values over a limit
Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], maximum weekly average3.5 mg/L≤ 2 mg/L75%
April 2026Chlorine, total residual, daily minimum.13 mg/L≥ .5 mg/L74%
April 2026Chlorine, total residual, daily maximum.1 mg/L< .06 mg/L67%
April 2026Nitrogen, ammonia total [as N], maximum weekly average3.61 lb/d≤ 2.94 lb/d23%
May 2026Chlorine, total residual, daily minimum.12 mg/L≥ .5 mg/L76%
May 2026Chlorine, total residual, daily maximum.12 mg/L< .06 mg/L100%
May 2026Nitrogen, ammonia total [as N], monthly average2.45 lb/d≤ 1.19 lb/d106%
May 2026Nitrogen, ammonia total [as N], maximum weekly average2.15 mg/L≤ 2 mg/L8%
May 2026Nitrogen, ammonia total [as N], maximum weekly average3.88 lb/d≤ 1.84 lb/d111%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average20.3 lb/d≤ 18.4 lb/d10%
June 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average38.84 lb/d≤ 27.5 lb/d41%
June 2026Chlorine, total residual, daily minimum.19 mg/L≥ .5 mg/L62%
June 2026Chlorine, total residual, daily maximum.07 mg/L< .06 mg/L17%
June 2026E. coli, colony forming units [CFU], daily maximum510 CFU/100mL≤ 235 CFU/100mL117%
June 2026E. coli, colony forming units [CFU], monthly geometric mean224 CFU/100mL≤ 125 CFU/100mL79%
June 2026Nitrogen, ammonia total [as N], monthly average2.02 mg/L≤ 1.3 mg/L55%
June 2026Nitrogen, ammonia total [as N], monthly average6.216 lb/d≤ 1.19 lb/d422%
June 2026Nitrogen, ammonia total [as N], maximum weekly average3.29 mg/L≤ 2 mg/L65%
June 2026Nitrogen, ammonia total [as N], maximum weekly average9.827 lb/d≤ 1.84 lb/d434%
July 2026Chlorine, total residual, daily minimum.2 mg/L≥ .5 mg/L60%
July 2026Nitrogen, ammonia total [as N], maximum weekly average1.88 lb/d≤ 1.84 lb/d2%
July 2026Nitrogen, ammonia total [as N], maximum weekly average2.4 mg/L≤ 2 mg/L20%
August 2026Chlorine, total residual, daily minimum.17 mg/L≥ .5 mg/L66%
August 2026Chlorine, total residual, daily maximum.11 mg/L< .06 mg/L83%

Limits in force (36)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 24 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 36 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 27.5 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 22 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 41.3 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 33 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 3.2 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.19 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.93 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.84 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.94 lb/dJan, Feb, Mar, Apr, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average< .06 mg/LApr–Oct
Chlorine, total residualdaily maximum< .06 mg/LApr–Oct
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 30 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 22.9 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18.4 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 36.7 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 27.5 lb/dMay–Nov
Flow, totalmonthly totalreport only (Mgal/mo)all year

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/IN0020443 · MCP: https://passage-data.com/mcp