ST LEON WWTP
NPDES ID: IN0058408
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: 6 effluent violations.
Violations
June 30, 2026
E. coli, colony forming units [CFU]
133% over limit
Discharged 548 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
98% over limit
Discharged 30.3 mg/L against a permitted limit of 15.3 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
36% over limit
Discharged 20.82 mg/L against a permitted limit of 15.3 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
47% over limit
Discharged 14.959 mg/L against a permitted limit of 10.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
41% over limit
Discharged 21.567 mg/L against a permitted limit of 15.3 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 14.349 mg/L against a permitted limit of 10.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
6% over limit
Discharged 47.7 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
70% over limit
Discharged 50.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
34% over limit
Discharged 60.333 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 112.16523906 kg/d against a permitted limit of 97.15599918 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
August 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
Solids, total suspended
32% over limit
Discharged 59.33 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
46% over limit
Discharged 181.94 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 37.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
36% over limit
Discharged 61.133 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
45% over limit
Discharged 43.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli, colony forming units [CFU]
38% over limit
Discharged 172.85 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli, colony forming units [CFU]
228% over limit
Discharged 770 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
24% over limit
Discharged 154.45 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli, colony forming units [CFU]
20% over limit
Discharged 149.73 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
193% over limit
Discharged 689.3 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (10 hours ago)