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Claypool WWTP

Sewage treatment plant, Claypool, Indiana. NPDES permit IN0039870, in force until May 31, 2031. Last 12 months: over a limit 8 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (21 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], monthly average29.15 mg/L≤ 12.1 mg/L141%
February 2026Nitrogen, ammonia total [as N], maximum weekly average29.15 mg/L≤ 18.2 mg/L60%
March 2026Nitrogen, ammonia total [as N], monthly average30.3 mg/L≤ 12.1 mg/L150%
March 2026Nitrogen, ammonia total [as N], maximum weekly average31.4 mg/L≤ 18.2 mg/L73%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average43 mg/L≤ 25 mg/L72%
July 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average43 mg/L≤ 40 mg/L8%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average32.1 mg/L≤ 25 mg/L28%
August 2026E. coli, colony forming units [CFU], daily maximum285 CFU/100mL≤ 235 CFU/100mL21%

Limits in force (23)

ParameterStatisticLimitMonths
Streamflowmonthly averagereport only (MGD)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 70 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 105 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 10.1 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 12.1 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 15.2 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 18.2 mg/LJan, 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
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
Dilution factordaily maximum≤ .1 Ratioall year
Flow, totalmonthly totalreport only (Mgal/mo)all year

New limits from May 31, 2031

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average4.2 mg/L (May–Nov)tighter0.845 mg/L (3 values)0.201×
Nitrogen, ammonia total [as N], monthly average8.1 mg/L (Jan, Feb, Mar, Apr, Dec)tighter——
Nitrogen, ammonia total [as N], weekly average6.3 mg/L (May–Nov)tighter——
Solids, total suspended, monthly average30 mg/Ltighter28 mg/L (5 values)0.933×
Solids, total suspended, weekly average45 mg/Ltighter——

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/IN0039870 · MCP: https://passage-data.com/mcp