MOUNT PLEASANT WATER SUPPLY TREATMENT FACILITY
NPDES ID: NY0284289
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Iron, total [as Fe]
151% over limit
Discharged 0.754 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Manganese, total [as Mn]
222% over limit
Discharged 0.965 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
780% over limit
Discharged 2.64 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Iron, total [as Fe]
293% over limit
Discharged 1.18 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
43% over limit
Discharged 0.43 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Iron, total [as Fe]
115% over limit
Discharged 0.646 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
149% over limit
Discharged 0.746 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Manganese, total [as Mn]
149% over limit
Discharged 0.746 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
115% over limit
Discharged 0.646 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Manganese, total [as Mn]
203% over limit
Discharged 0.91 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
243% over limit
Discharged 1.03 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Manganese, total [as Mn]
45% over limit
Discharged 0.436 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
283% over limit
Discharged 1.15 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Manganese, total [as Mn]
80% over limit
Discharged 0.54 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total [as Fe]
253% over limit
Discharged 1.06 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Iron, total [as Fe]
430% over limit
Discharged 1.59 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Manganese, total [as Mn]
94% over limit
Discharged 0.581 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Iron, total [as Fe]
71% over limit
Discharged 0.514 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Arsenic, total [as As]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (MO AVG)
DMR, Limited - Overdue
Manganese, total [as Mn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
Iron, total [as Fe]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.3 mg/L (MO AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)