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Chesterfield WWTP

Sewage treatment plant, major discharger, Chesterfield, Indiana. NPDES permit IN0063983, in force until Oct 31, 2027. Last 12 months: over a limit 43 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
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
23 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 43 values over a limit
Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], monthly average1.758 mg/L≤ 1.6 mg/L10%
December 2025Nitrogen, ammonia total [as N], maximum weekly average4.97 mg/L≤ 2.4 mg/L107%
December 2025Oxygen, dissolved [DO], daily average minimum4.7 mg/L≥ 6 mg/L22%
December 2025Solids, total suspended, monthly average30 mg/L≤ 12 mg/L150%
December 2025Solids, total suspended, maximum weekly average222.1 lb/d≤ 150 lb/d48%
December 2025Solids, total suspended, maximum weekly average76.83 mg/L≤ 18 mg/L327%
January 2026Solids, total suspended, maximum weekly average20.8 mg/L≤ 18 mg/L16%
February 2026Nitrogen, ammonia total [as N], monthly average15.41 lb/d≤ 13.4 lb/d15%
February 2026Nitrogen, ammonia total [as N], monthly average5.597 mg/L≤ 1.6 mg/L250%
February 2026Nitrogen, ammonia total [as N], maximum weekly average16.81 mg/L≤ 2.4 mg/L600%
February 2026Nitrogen, ammonia total [as N], maximum weekly average45.32 lb/d≤ 20 lb/d127%
February 2026Phosphorus, total [as P], monthly average2.3 mg/L≤ 1 mg/L130%
February 2026Solids, total suspended, monthly average16.9 mg/L≤ 12 mg/L41%
February 2026Solids, total suspended, maximum weekly average28.1 mg/L≤ 18 mg/L56%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average14.7 mg/L≤ 10 mg/L47%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average247.00978 lb/d≤ 125 lb/d98%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average46.633333 mg/L≤ 15 mg/L211%
March 2026Nitrogen, ammonia total [as N], monthly average31.661532 lb/d≤ 13.4 lb/d136%
March 2026Nitrogen, ammonia total [as N], monthly average6.3477 mg/L≤ 1.6 mg/L297%
March 2026Nitrogen, ammonia total [as N], maximum weekly average17.56667 mg/L≤ 2.4 mg/L632%
March 2026Nitrogen, ammonia total [as N], maximum weekly average92.31907 lb/d≤ 20 lb/d362%
March 2026Phosphorus, total [as P], monthly average3.4 mg/L≤ 1 mg/L240%
March 2026Solids, total suspended, monthly average100.50669 lb/d≤ 100 lb/d1%
March 2026Solids, total suspended, monthly average22 mg/L≤ 12 mg/L83%
March 2026Solids, total suspended, maximum weekly average246.59698 lb/d≤ 150 lb/d64%
March 2026Solids, total suspended, maximum weekly average47.46667 mg/L≤ 18 mg/L164%
April 2026E. coli, colony forming units [CFU], daily maximum388 CFU/100mL≤ 235 CFU/100mL65%
May 2026Oxygen, dissolved [DO], daily average minimum.3 mg/L≥ 6 mg/L95%
May 2026Phosphorus, total [as P], monthly average1.1 mg/L≤ 1 mg/L10%
June 2026Oxygen, dissolved [DO], daily average minimum.33 mg/L≥ 6 mg/L95%
June 2026Phosphorus, total [as P], monthly average1.1 mg/L≤ 1 mg/L10%
June 2026Solids, total suspended, monthly average155.8 lb/d≤ 100 lb/d56%
June 2026Solids, total suspended, monthly average33.3 mg/L≤ 12 mg/L178%
June 2026Solids, total suspended, maximum weekly average114.7 mg/L≤ 18 mg/L537%
June 2026Solids, total suspended, maximum weekly average548.8 lb/d≤ 150 lb/d266%
July 2026Nitrogen, ammonia total [as N], maximum weekly average2.625 mg/L≤ 1.6 mg/L64%
July 2026Oxygen, dissolved [DO], daily average minimum.33 mg/L≥ 6 mg/L95%
July 2026Phosphorus, total [as P], monthly average2.3 mg/L≤ 1 mg/L130%
July 2026pH, daily maximum9.1 SU≤ 9 SU—
August 2026Phosphorus, total [as P], monthly average3.9 mg/L≤ 1 mg/L290%
August 2026Solids, total suspended, monthly average139 lb/d≤ 100 lb/d39%
August 2026Solids, total suspended, maximum weekly average18.7 mg/L≤ 18 mg/L4%
August 2026Solids, total suspended, maximum weekly average325 lb/d≤ 150 lb/d117%

Limits in force (38)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 12 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 18 mg/Lall year
Solids, total suspendedmonthly average≤ 100 lb/dall year
Solids, total suspendedmaximum weekly average≤ 150 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
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≤ 9.2 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 13.4 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 13.4 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 20 lb/dJan, Feb, Mar, Apr, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
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
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteApr
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteMay
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 8 tox chronicApr
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 8 tox chronicMay
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteApr
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteMay
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 8 tox chronicApr
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 8 tox chronicMay
Mercury, total recoverablemonthly average≤ 12 ng/LFeb, Apr, Jun, Aug, Oct, Dec
Mercury, total recoverabledaily maximum≤ 20 ng/LFeb, Apr, Jun, Aug, Oct, Dec
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 83 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 125 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.

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