WILLIAMSTOWN WATER
NPDES ID: PA0087572
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
February 28, 2026
Aluminum, total [as Al]
3% over limit
Discharged 1.85 mg/L against a permitted limit of 1.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
400% over limit
Discharged 0.3632 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
317% over limit
Discharged 0.454 kg/d against a permitted limit of 0.10896 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Aluminum, total [as Al]
150% over limit
Discharged 0.1816 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
122% over limit
Discharged 4 mg/L against a permitted limit of 1.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
233% over limit
Discharged 0.3632 kg/d against a permitted limit of 0.10896 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
90% over limit
Discharged 2.28 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Aluminum, total [as Al]
2% over limit
Discharged 1.84 mg/L against a permitted limit of 1.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
25% over limit
Discharged 0.0908 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Aluminum, total [as Al]
61% over limit
Discharged 2.89 mg/L against a permitted limit of 1.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
48% over limit
Discharged 1.77 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Aluminum, total [as Al]
25% over limit
Discharged 0.1362 kg/d against a permitted limit of 0.10896 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
25% over limit
Discharged 0.0908 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Aluminum, total [as Al]
88% over limit
Discharged 0.1362 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
87% over limit
Discharged 2.24 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
112% over limit
Discharged 3.81 mg/L against a permitted limit of 1.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
150% over limit
Discharged 0.2724 kg/d against a permitted limit of 0.10896 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Aluminum, total [as Al]
25% over limit
Discharged 0.0908 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
25% over limit
Discharged 0.1362 kg/d against a permitted limit of 0.10896 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Aluminum, total [as Al]
25% over limit
Discharged 0.0908 kg/d against a permitted limit of 0.07264 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)