UNITED STATES GYPSUM COMPANY
NPDES ID: OH0031046
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: 3 effluent violations.
Violations
April 30, 2026
Solids, total suspended
47% over limit
Discharged 220 kg/d against a permitted limit of 150 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 61 mg/L against a permitted limit of 48.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 140 kg/d against a permitted limit of 100 kg/d (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
31% over limit
Discharged 64 mg/L against a permitted limit of 48.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
53% over limit
Discharged 33 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
31% over limit
Discharged 75 mg/L against a permitted limit of 57.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
125% over limit
Discharged 100 kg/d against a permitted limit of 44.5 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
37% over limit
Discharged 180 kg/d against a permitted limit of 131.6 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
110% over limit
Discharged 120 mg/L against a permitted limit of 57.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
289% over limit
Discharged 84 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
82% over limit
Discharged 81 kg/d against a permitted limit of 44.5 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
31% over limit
Discharged 75 mg/L against a permitted limit of 57.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
159% over limit
Discharged 56 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
3% over limit
Discharged 46 kg/d against a permitted limit of 44.5 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 27 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
pH, maximum
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Oxygen, dissolved [DO]
6% over limit
Discharged 4.7 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, 5-day, 20 deg. C
10% over limit
Discharged 49 kg/d against a permitted limit of 44.5 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
30% over limit
Discharged 28 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
39% over limit
Discharged 30 mg/L against a permitted limit of 21.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
51% over limit
Discharged 67 kg/d against a permitted limit of 44.5 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)