OAK HILL, CITY OF
NPDES ID: WV0020281
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
Nitrogen, ammonia total [as N]
28% over limit
Discharged 17.5 mg/L against a permitted limit of 13.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
5% over limit
Discharged 0.11 mg/L against a permitted limit of 0.105 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, suspended percent removal
21% over limit
Discharged 81.8 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Copper, total recoverable
57% over limit
Discharged 0.0094 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
1% over limit
Discharged 84.9 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Copper, total recoverable
82% over limit
Discharged 0.0218 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Zinc, total recoverable
34% over limit
Discharged 0.075 mg/L against a permitted limit of 0.056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
250% over limit
Discharged 0.042 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
217% over limit
Discharged 0.019 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
36% over limit
Discharged 0.143 mg/L against a permitted limit of 0.105 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, suspended percent removal
45% over limit
Discharged 78.3 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Copper, total recoverable
492% over limit
Discharged 0.071 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
467% over limit
Discharged 0.034 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, suspended percent removal
4% over limit
Discharged 84.4 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Coliform, fecal general
90% over limit
Discharged 760 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
5% over limit
Discharged 0.0063 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Coliform, fecal general
87% over limit
Discharged 373 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Copper, total recoverable
28% over limit
Discharged 0.0077 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Oil and grease, hexane extr method
21% over limit
Discharged 36.4 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
89% over limit
Discharged 0.02262 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
58% over limit
Discharged 0.009473 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
117% over limit
Discharged 0.013 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
8% over limit
Discharged 0.013 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total recoverable
64% over limit
Discharged 0.00982 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
80% over limit
Discharged 450 mg/L against a permitted limit of 250 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total recoverable
2% over limit
Discharged 0.0061 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
853% over limit
Discharged 286 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Lead, total recoverable
500% over limit
Discharged 0.012 mg/L against a permitted limit of 0.002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
89% over limit
Discharged 56.7 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
900% over limit
Discharged 0.05 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
29% over limit
Discharged 0.00774 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Oil and grease, hexane extr method
95% over limit
Discharged 58.5 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total recoverable
160% over limit
Discharged 0.169 mg/L against a permitted limit of 0.065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
66% over limit
Discharged 0.169 mg/L against a permitted limit of 0.102 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total recoverable
33% over limit
Discharged 0.008 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
17% over limit
Discharged 82.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2025
Coliform, fecal general
1156% over limit
Discharged 2511 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
2400% over limit
Discharged 10000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Coliform, fecal general
10406% over limit
Discharged 21012.2 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
53% over limit
Discharged 305 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Coliform, fecal general
5153% over limit
Discharged 21012.2 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
123% over limit
Discharged 67 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Coliform, fecal general
148% over limit
Discharged 991 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.0001589 kg/d (DAILY MX)
DMR, Limited - Overdue
January 31, 2025
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.0001589 kg/d (DAILY MX)
DMR, Limited - Overdue
Zinc, total recoverable
10% over limit
Discharged 0.0718 mg/L against a permitted limit of 0.065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Oil and grease, hexane extr method
51% over limit
Discharged 45.4 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
8% over limit
Discharged 0.013 mg/L against a permitted limit of 0.012 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
December 31, 2024
Lead, total recoverable
820% over limit
Discharged 0.046 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil and grease, hexane extr method
417% over limit
Discharged 155 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
450% over limit
Discharged 0.011 mg/L against a permitted limit of 0.002 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.0001589 kg/d (DAILY MX)
DMR, Limited - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Oil and grease, hexane extr method
122% over limit
Discharged 66.5 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Oil and grease, hexane extr method
54% over limit
Discharged 46.2 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Copper, total recoverable
97% over limit
Discharged 0.0118 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 274 mg/L against a permitted limit of 250 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Copper, total recoverable
17% over limit
Discharged 0.007 mg/L against a permitted limit of 0.006 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)