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Second Tamerix Lake Addition

Sewage treatment plant, Columbus, Indiana. NPDES permit IN0043681, in force until Apr 30, 2030. Last 12 months: over a limit 13 times (last February 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (23 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 2 required values missing, 3 of 12 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average25.5 mg/L≤ 23 mg/L11%
October 2025E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
October 2025Nitrogen, ammonia total [as N], monthly average3.812 mg/L≤ 1.1 mg/L247%
October 2025Nitrogen, ammonia total [as N], maximum weekly average.24 lb/d≤ .17 lb/d41%
October 2025Nitrogen, ammonia total [as N], maximum weekly average18.6 mg/L≤ 1.6 mg/L1063%
October 2025Solids, total suspended, monthly average18.1 mg/L≤ 18 mg/L1%
November 2025Nitrogen, ammonia total [as N], monthly average2.079 mg/L≤ 1.1 mg/L89%
November 2025Nitrogen, ammonia total [as N], maximum weekly average.342 lb/d≤ .17 lb/d101%
November 2025Nitrogen, ammonia total [as N], maximum weekly average7.9 mg/L≤ 1.6 mg/L394%
January 2026Nitrogen, ammonia total [as N], maximum weekly average6.44 mg/L≤ 2.4 mg/L168%
February 2026Nitrogen, ammonia total [as N], monthly average2.418 mg/L≤ 1.6 mg/L51%
February 2026Nitrogen, ammonia total [as N], maximum weekly average.4398 lb/d≤ .26 lb/d69%
February 2026Nitrogen, ammonia total [as N], maximum weekly average10.2 mg/L≤ 2.4 mg/L325%

Limits in force (36)

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/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 18 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 27 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 3.2 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 1.9 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 4.8 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 2.9 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.6 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.4 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ .12 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ .17 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ .17 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ .26 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≤ 15 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≤ 23 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.7 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.6 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 4.3 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 2.5 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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Your permit document is the final word. As JSON: /api/v1/permits/IN0043681 · MCP: https://passage-data.com/mcp