DARBYDALE WWTP
NPDES ID: OH0130923
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.
Violations
March 31, 2026
Nitrogen, ammonia total [as N]
185% over limit
Discharged 16 kg/d against a permitted limit of 5.62 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
73% over limit
Discharged 5.7 mg/L against a permitted limit of 3.3 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 4.1 kg/d against a permitted limit of 3.75 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
224% over limit
Discharged 10.7 mg/L against a permitted limit of 3.3 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
90% over limit
Discharged 7.12 kg/d against a permitted limit of 3.75 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
145% over limit
Discharged 5.38 mg/L against a permitted limit of 2.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
172% over limit
Discharged 15.3 kg/d against a permitted limit of 5.62 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
October 31, 2025
Phosphorus, total [as P]
3% over limit
Discharged 1.54 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
September 30, 2025
Solids, total dissolved- 180 deg. C
0% over limit
Discharged 0 kg/d against a permitted limit of 2600 kg/d (MO AVG)
DMR, Limited - Overdue
September 30, 2024
Phosphorus, total [as P]
231% over limit
Discharged 3.31 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
51% over limit
Discharged 3.85 kg/d against a permitted limit of 2.55 kg/d (WKLY MAX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
173% over limit
Discharged 4.09 mg/L against a permitted limit of 1.5 mg/L (WKLY MAX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
52% over limit
Discharged 2.58 kg/d against a permitted limit of 1.7 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Phosphorus, total [as P]
10% over limit
Discharged 1.1 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)