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Gaston WWTP, Town of

Sewage treatment plant, Gaston, Indiana. NPDES permit IN0020338, in force until Dec 31, 2030. Last 12 months: over a limit 16 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (23 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
May 2026Chlorine, total residual, daily maximum.09 mg/L≤ .06 mg/L50%
May 2026Solids, total suspended, monthly average13.2 mg/L≤ 12 mg/L10%
May 2026Solids, total suspended, monthly average36.5 lb/d≤ 30 lb/d22%
May 2026Solids, total suspended, maximum weekly average35.2 mg/L≤ 18 mg/L96%
May 2026Solids, total suspended, maximum weekly average89.5 lb/d≤ 45.1 lb/d98%
June 2026Nitrogen, ammonia total [as N], maximum weekly average2.5 mg/L≤ 1.9 mg/L32%
August 2026Chlorine, total residual, daily minimum.046 mg/L≥ .5 mg/L91%
August 2026Chlorine, total residual, daily maximum.07 mg/L≤ .06 mg/L17%
August 2026E. coli, colony forming units [CFU], daily maximum1011 CFU/100mL≤ 235 CFU/100mL330%
August 2026Nitrogen, ammonia total [as N], monthly average3.4 lb/d≤ 3.3 lb/d3%
August 2026Nitrogen, ammonia total [as N], maximum weekly average7.2 lb/d≤ 4.8 lb/d50%
August 2026Oxygen, dissolved [DO], daily average minimum4 mg/L≥ 6 mg/L33%
August 2026Solids, total suspended, monthly average12.8 mg/L≤ 12 mg/L7%
August 2026Solids, total suspended, monthly average69.5 lb/d≤ 30 lb/d132%
August 2026Solids, total suspended, maximum weekly average206.4 lb/d≤ 45.1 lb/d358%
August 2026Solids, total suspended, maximum weekly average27.1 mg/L≤ 18 mg/L51%

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≤ 12 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 18 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 75.1 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 30 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 112.7 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 45.1 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.9 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 4.8 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.8 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.3 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≤ 10 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≤ 15 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62.6 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 100.1 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 37.6 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/IN0020338 · MCP: https://passage-data.com/mcp