DEARBORN COUNTY RSD HIGH RIDGE WWTP
NPDES ID: IN0063525
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: 24 effluent violations, 4 single-event violations.
Violations
May 31, 2026
Chlorine, total residual
2500% over limit
Discharged 1.56 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 2.24 mg/L against a permitted limit of 1.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
9900% over limit
Discharged 6 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
224% over limit
Discharged 7.78 mg/L against a permitted limit of 2.4 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
208% over limit
Discharged 0.55842 kg/d against a permitted limit of 0.1816 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
106% over limit
Discharged 37.1 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
198% over limit
Discharged 80.5 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 2.09747998 kg/d against a permitted limit of 2.04299998 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 0.15436 kg/d against a permitted limit of 0.12258 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
60% over limit
Discharged 0.2 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
209% over limit
Discharged 14.81 mg/L against a permitted limit of 4.8 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
104% over limit
Discharged 61.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 2.50153998 kg/d against a permitted limit of 2.26999998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
71% over limit
Discharged 0.62197999 kg/d against a permitted limit of 0.3632 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
311% over limit
Discharged 184.8 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
132% over limit
Discharged 7.91321993 kg/d against a permitted limit of 3.40499997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
533% over limit
Discharged 791 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Chlorine, total residual
80% over limit
Discharged 0.1 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 0.29056 kg/d against a permitted limit of 0.24062 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
717% over limit
Discharged 0.49 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
68% over limit
Discharged 5.39 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
5067% over limit
Discharged 3.1 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
78% over limit
Discharged 8.53 mg/L against a permitted limit of 4.8 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
74% over limit
Discharged 0.41768 kg/d against a permitted limit of 0.24062 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
500% over limit
Discharged 20.44361983 kg/d against a permitted limit of 3.40499997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
162% over limit
Discharged 5.94739995 kg/d against a permitted limit of 2.26999998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
565% over limit
Discharged 299.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
213% over limit
Discharged 93.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
75% over limit
Discharged 5.6 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
171% over limit
Discharged 0.98517999 kg/d against a permitted limit of 0.3632 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 4.03151997 kg/d against a permitted limit of 3.04179997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
1163% over limit
Discharged 379 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1395% over limit
Discharged 50.89339957 kg/d against a permitted limit of 3.40499997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
2398% over limit
Discharged 1124 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
159% over limit
Discharged 103.5 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
690% over limit
Discharged 17.92845985 kg/d against a permitted limit of 2.26999998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
79% over limit
Discharged 44.8 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
104% over limit
Discharged 61.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
174% over limit
Discharged 9.33877992 kg/d against a permitted limit of 3.40499997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
582% over limit
Discharged 307 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
74% over limit
Discharged 8.34 mg/L against a permitted limit of 4.8 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
16% over limit
Discharged 20.8 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
70% over limit
Discharged 0.20884 kg/d against a permitted limit of 0.12258 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
180% over limit
Discharged 0.50848 kg/d against a permitted limit of 0.1816 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
17% over limit
Discharged 31.5 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
198% over limit
Discharged 7.16 mg/L against a permitted limit of 2.4 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
126% over limit
Discharged 3.62 mg/L against a permitted limit of 1.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
E. coli, colony forming units [CFU]
61% over limit
Discharged 201 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 3.55 mg/L against a permitted limit of 2.4 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
80% over limit
Discharged 0.1 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
467% over limit
Discharged 0.34 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
183% over limit
Discharged 0.17 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
60% over limit
Discharged 0.2 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
61% over limit
Discharged 201 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
950% over limit
Discharged 0.63 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
8% over limit
Discharged 0.46 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
183% over limit
Discharged 0.17 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Chlorine, total residual
1067% over limit
Discharged 0.7 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
48% over limit
Discharged 0.26 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
6% over limit
Discharged 250 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
6233% over limit
Discharged 3.8 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Chlorine, total residual
42% over limit
Discharged 0.29 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
1417% over limit
Discharged 0.91 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 28.15 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
93% over limit
Discharged 241 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Chlorine, total residual
3733% over limit
Discharged 2.3 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli, colony forming units [CFU]
176% over limit
Discharged 649 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
717% over limit
Discharged 0.49 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
96% over limit
Discharged 0.02 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
2417% over limit
Discharged 1.51 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli, colony forming units [CFU]
390% over limit
Discharged 612 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
240% over limit
Discharged 152.9 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
18% over limit
Discharged 2.68313998 kg/d against a permitted limit of 2.26999998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
182% over limit
Discharged 9.60209992 kg/d against a permitted limit of 3.40499997 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
117% over limit
Discharged 0.13 mg/L against a permitted limit of 0.06 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
96% over limit
Discharged 0.02 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
42% over limit
Discharged 42.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
1183% over limit
Discharged 0.77 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
E. coli, colony forming units [CFU]
27219% over limit
Discharged 64200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
94% over limit
Discharged 52.47 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
66% over limit
Discharged 29.8 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
56% over limit
Discharged 0.22 mg/L against a permitted limit of 0.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli, colony forming units [CFU]
26794% over limit
Discharged 63200 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
4% over limit
Discharged 18.8 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
314% over limit
Discharged 9.94 mg/L against a permitted limit of 2.4 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
236% over limit
Discharged 5.38 mg/L against a permitted limit of 1.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
28% over limit
Discharged 0.23154 kg/d against a permitted limit of 0.1816 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
66% over limit
Discharged 44.85 mg/L against a permitted limit of 27 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
5% over limit
Discharged 18.94 mg/L against a permitted limit of 18 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (6 days ago)