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Milan WWTP

Sewage treatment plant, Milan, Indiana. NPDES permit IN0023779, in force until Jul 31, 2029. Last 12 months: over a limit 45 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 (19 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 45 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, colony forming units [CFU], monthly geometric mean483 CFU/100mL≤ 125 CFU/100mL286%
October 2025Nitrogen, ammonia total [as N], monthly average1.37 mg/L≤ 1.3 mg/L5%
October 2025Nitrogen, ammonia total [as N], maximum weekly average5.72 mg/L≤ 2 mg/L186%
October 2025Nitrogen, ammonia total [as N], maximum weekly average7.79 lb/d≤ 7.5 lb/d4%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average103.1 lb/d≤ 68 lb/d52%
November 2025Solids, total suspended, monthly average17.5 mg/L≤ 14 mg/L25%
November 2025Solids, total suspended, monthly average98.1 lb/d≤ 53 lb/d85%
November 2025Solids, total suspended, maximum weekly average202.9 lb/d≤ 79 lb/d157%
November 2025Solids, total suspended, maximum weekly average28.1 mg/L≤ 21 mg/L34%
January 2026Solids, total suspended, monthly average50.9 mg/L≤ 30 mg/L70%
January 2026Solids, total suspended, maximum weekly average76.65 mg/L≤ 45 mg/L70%
February 2026Solids, total suspended, maximum weekly average267.8 lb/d≤ 169 lb/d58%
February 2026Solids, total suspended, maximum weekly average75.73 mg/L≤ 45 mg/L68%
March 2026Solids, total suspended, monthly average171.1 lb/d≤ 113 lb/d51%
March 2026Solids, total suspended, maximum weekly average599.8 lb/d≤ 169 lb/d255%
March 2026Solids, total suspended, maximum weekly average82.88 mg/L≤ 45 mg/L84%
April 2026E. coli, colony forming units [CFU], daily maximum2419.6 CFU/100mL≤ 235 CFU/100mL930%
April 2026E. coli, colony forming units [CFU], monthly geometric mean301 CFU/100mL≤ 125 CFU/100mL141%
April 2026Nitrogen, ammonia total [as N], monthly average2.37 mg/L≤ 2.2 mg/L8%
April 2026Nitrogen, ammonia total [as N], maximum weekly average4.83 mg/L≤ 3.3 mg/L46%
May 2026E. coli, colony forming units [CFU], daily maximum461.1 CFU/100mL≤ 235 CFU/100mL96%
May 2026Solids, total suspended, monthly average63.44 lb/d≤ 53 lb/d20%
May 2026Solids, total suspended, maximum weekly average106.4 lb/d≤ 79 lb/d35%
June 2026E. coli, colony forming units [CFU], daily maximum649 CFU/100mL≤ 235 CFU/100mL176%
June 2026E. coli, colony forming units [CFU], monthly geometric mean127 CFU/100mL≤ 125 CFU/100mL2%
June 2026Nitrogen, ammonia total [as N], maximum weekly average2.35 mg/L≤ 2 mg/L18%
June 2026Nitrogen, ammonia total [as N], maximum weekly average8.59 lb/d≤ 7.5 lb/d15%
June 2026Solids, total suspended, maximum weekly average80.7 lb/d≤ 79 lb/d2%
July 2026E. coli, colony forming units [CFU], daily maximum63200 CFU/100mL≤ 235 CFU/100mL26794%
July 2026E. coli, colony forming units [CFU], monthly geometric mean971 CFU/100mL≤ 125 CFU/100mL677%
July 2026Nitrogen, ammonia total [as N], monthly average2.6 mg/L≤ 1.3 mg/L100%
July 2026Nitrogen, ammonia total [as N], maximum weekly average5.63 mg/L≤ 2 mg/L182%
July 2026Nitrogen, ammonia total [as N], maximum weekly average7.83 lb/d≤ 7.5 lb/d4%
July 2026Solids, total suspended, monthly average15.2 mg/L≤ 14 mg/L9%
July 2026Solids, total suspended, maximum weekly average24.5 mg/L≤ 21 mg/L17%
August 2026E. coli, colony forming units [CFU], daily maximum63200 CFU/100mL≤ 235 CFU/100mL26794%
August 2026E. coli, colony forming units [CFU], monthly geometric mean472 CFU/100mL≤ 125 CFU/100mL278%
August 2026Nitrogen, ammonia total [as N], monthly average2.56 mg/L≤ 1.3 mg/L97%
August 2026Nitrogen, ammonia total [as N], monthly average7.45 lb/d≤ 4.9 lb/d52%
August 2026Nitrogen, ammonia total [as N], maximum weekly average19.95 lb/d≤ 7.5 lb/d166%
August 2026Nitrogen, ammonia total [as N], maximum weekly average6.01 mg/L≤ 2 mg/L201%
August 2026Solids, total suspended, monthly average17.1 mg/L≤ 14 mg/L22%
August 2026Solids, total suspended, monthly average64.71 lb/d≤ 53 lb/d22%
August 2026Solids, total suspended, maximum weekly average158.9 lb/d≤ 79 lb/d101%
August 2026Solids, total suspended, maximum weekly average23.73 mg/L≤ 21 mg/L13%

Limits in force (32)

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≤ 14 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 21 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 113 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 53 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 169 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 79 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.3 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 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≤ 4.9 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 8.3 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.5 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 12.4 lb/dJan, Feb, Mar, Apr, Dec
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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 38 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 18 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 94 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 45 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 143 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 68 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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