OTTOVILLE WWTP
NPDES ID: OH0021709
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: 2 effluent violations.
Violations
April 30, 2026
Mercury, total low level
82% over limit
Discharged 0.0000474 kg/d against a permitted limit of 0.000026 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total low level
78% over limit
Discharged 0.0000348 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Mercury, total low level
10% over limit
Discharged 0.0000215 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Mercury, total low level
54% over limit
Discharged 0.0000301 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Mercury, total low level
21% over limit
Discharged 0.0000238 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Mercury, total low level
55% over limit
Discharged 0.0000304 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli, MTEC-MF
124% over limit
Discharged 635 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
20% over limit
Discharged 151 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
January 31, 2025
Mercury, total low level
16% over limit
Discharged 0.0000227 mg/L against a permitted limit of 0.0000196 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
E. coli, MTEC-MF
3% over limit
Discharged 292 MPN/100mL against a permitted limit of 284 MPN/100mL (WK GEOMN)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
59% over limit
Discharged 200 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli, MTEC-MF
28% over limit
Discharged 161 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)