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Clarks Hill Municipal WWTP

Sewage treatment plant, Clarks Hill, Indiana. NPDES permit IN0039853, in force until May 31, 2030. Last 12 months: over a limit 30 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 27 days after each period: form A monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
20 values over a limit, 1 required value missing, 1 of 12 reports late

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

All 30 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average48.9 mg/L≤ 25 mg/L96%
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average80.9 mg/L≤ 40 mg/L102%
October 2025Chlorine, total residual, daily minimum.4 mg/L≥ .5 mg/L20%
October 2025Chlorine, total residual, daily maximum.06 mg/L< .06 mg/L0%
October 2025Nitrogen, ammonia total [as N], monthly average24.416 mg/L≤ 1.5 mg/L1528%
October 2025Nitrogen, ammonia total [as N], monthly average8.1062 lb/d≤ 1.4 lb/d479%
October 2025Nitrogen, ammonia total [as N], maximum weekly average11.145 lb/d≤ 2.1 lb/d431%
October 2025Nitrogen, ammonia total [as N], maximum weekly average35.1 mg/L≤ 2.2 mg/L1495%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average34.2 mg/L≤ 25 mg/L37%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average78.1 mg/L≤ 40 mg/L95%
November 2025Nitrogen, ammonia total [as N], monthly average14.323 mg/L≤ 1.5 mg/L855%
November 2025Nitrogen, ammonia total [as N], monthly average4.5903 lb/d≤ 1.4 lb/d228%
November 2025Nitrogen, ammonia total [as N], maximum weekly average19.733 mg/L≤ 2.2 mg/L797%
November 2025Nitrogen, ammonia total [as N], maximum weekly average6.429 lb/d≤ 2.1 lb/d206%
April 2026Chlorine, total residual, daily minimum.42 mg/L≥ .5 mg/L16%
April 2026Nitrogen, ammonia total [as N], maximum weekly average3.2946 lb/d≤ 3.2 lb/d3%
April 2026Solids, total suspended, maximum weekly average52.974 lb/d≤ 43.2 lb/d23%
May 2026Chlorine, total residual, daily maximum.07 mg/L< .06 mg/L17%
June 2026Chlorine, total residual, daily minimum.3 mg/L≥ .5 mg/L40%
July 2026Nitrogen, ammonia total [as N], monthly average1.514 mg/L≤ 1.5 mg/L1%
July 2026Nitrogen, ammonia total [as N], maximum weekly average2.795 mg/L≤ 2.2 mg/L27%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average28.8 mg/L≤ 25 mg/L15%
August 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average39.368 lb/d≤ 38.4 lb/d3%
August 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average43.6 mg/L≤ 40 mg/L9%
August 2026Chlorine, total residual, daily minimum.35 mg/L≥ .5 mg/L30%
August 2026Nitrogen, ammonia total [as N], monthly average10.511 mg/L≤ 1.5 mg/L601%
August 2026Nitrogen, ammonia total [as N], monthly average8.8042 lb/d≤ 1.4 lb/d529%
August 2026Nitrogen, ammonia total [as N], maximum weekly average11.734 lb/d≤ 2.1 lb/d459%
August 2026Nitrogen, ammonia total [as N], maximum weekly average13.25 mg/L≤ 2.2 mg/L502%
August 2026Oxygen, dissolved [DO], daily average minimum5.3 mg/L≥ 6 mg/L12%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 28.8 lb/dall year
Solids, total suspendedmaximum weekly average≤ 43.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.2 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 3.3 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.4 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 2.1 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.1 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 3.2 lb/dJan, Feb, Mar, Apr, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
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/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 24 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 38.4 lb/dall year
Flow, totalmonthly totalreport only (Mgal/mo)all year

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/IN0039853 · MCP: https://passage-data.com/mcp