SWANTON WRRF
NPDES ID: OH0020524
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 13 effluent violations.
Violations
June 30, 2026
Chlorine, total residual
809% over limit
Discharged 0.1 mg/L against a permitted limit of 0.011 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
558% over limit
Discharged 0.25 kg/d against a permitted limit of 0.038 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
pH, minimum
0% over limit
Discharged 6.35 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
May 31, 2026
BOD, carbonaceous [5 day, 20 C]
40% over limit
Discharged 21 mg/L against a permitted limit of 15 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
30% over limit
Discharged 13 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
33% over limit
Discharged 24 mg/L against a permitted limit of 18 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
127% over limit
Discharged 34 mg/L against a permitted limit of 15 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 100 kg/d against a permitted limit of 94.7 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 240 kg/d against a permitted limit of 171 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
34% over limit
Discharged 190 kg/d against a permitted limit of 142 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
90% over limit
Discharged 19 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 16 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total low level
74% over limit
Discharged 0.0000296 kg/d against a permitted limit of 0.000017 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 11 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Phosphorus, total [as P]
24% over limit
Discharged 1.86 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
16% over limit
Discharged 1.16 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total low level
220% over limit
Discharged 0.0000152 mg/L against a permitted limit of 0.00000475 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
194% over limit
Discharged 5.88 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH, minimum
0% over limit
Discharged 4.52 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
513% over limit
Discharged 18.4 mg/L against a permitted limit of 3 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
745% over limit
Discharged 2400 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
September 30, 2025
pH, minimum
0% over limit
Discharged 5.94 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
61% over limit
Discharged 3.21 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
290% over limit
Discharged 11.7 mg/L against a permitted limit of 3 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
June 30, 2025
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 18 mg/L against a permitted limit of 15 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
6% over limit
Discharged 19 mg/L against a permitted limit of 18 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
February 28, 2025
Mercury, total low level
15% over limit
Discharged 0.0000196 kg/d against a permitted limit of 0.000017 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
pH, minimum
0% over limit
Discharged 6.17 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
December 31, 2024
Mercury, total low level
15% over limit
Discharged 0.00000548 mg/L against a permitted limit of 0.00000475 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
pH, minimum
0% over limit
Discharged 6.45 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
42% over limit
Discharged 4.27 mg/L against a permitted limit of 3 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (3 hours ago)