COLFAX WWTP, TOWN OF
NPDES ID: IN0020443
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 18 effluent violations.
Violations
June 30, 2026
E. coli, colony forming units [CFU]
79% over limit
Discharged 224 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Chlorine, total residual
62% over limit
Discharged 0.19 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
434% over limit
Discharged 4.46145796 kg/d against a permitted limit of 0.83536 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
41% over limit
Discharged 17.63335985 kg/d against a permitted limit of 12.485 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
65% over limit
Discharged 3.29 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 9.21619992 kg/d against a permitted limit of 8.3536 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
117% over limit
Discharged 510 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
55% over limit
Discharged 2.02 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
17% over limit
Discharged 0.07 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
422% over limit
Discharged 2.82206398 kg/d against a permitted limit of 0.54026 kg/d (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Chlorine, total residual
76% over limit
Discharged 0.12 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
106% over limit
Discharged 1.11229999 kg/d against a permitted limit of 0.54026 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
8% over limit
Discharged 2.15 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
111% over limit
Discharged 1.76151999 kg/d against a permitted limit of 0.83536 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
100% over limit
Discharged 0.12 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Chlorine, total residual
67% over limit
Discharged 0.1 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
74% over limit
Discharged 0.13 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
23% over limit
Discharged 1.63893999 kg/d against a permitted limit of 1.33476 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
75% over limit
Discharged 3.5 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
605% over limit
Discharged 14.1 mg/L against a permitted limit of 2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
254% over limit
Discharged 2.96007998 kg/d against a permitted limit of 0.83536 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
528% over limit
Discharged 8.16 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
222% over limit
Discharged 1.73881999 kg/d against a permitted limit of 0.54026 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Chlorine, total residual
6% over limit
Discharged 0.47 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 1.44 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
136% over limit
Discharged 1.27573999 kg/d against a permitted limit of 0.54026 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
18% over limit
Discharged 0.41 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
167% over limit
Discharged 2.23367998 kg/d against a permitted limit of 0.83536 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
May 31, 2025
Chlorine, total residual
17% over limit
Discharged 0.07 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Chlorine, total residual
10% over limit
Discharged 0.45 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
33% over limit
Discharged 0.08 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (6 hours ago)