CHARLES RIVER PCD
NPDES ID: MA0102598
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: 1 effluent violation.
Violations
April 30, 2026
Phosphorus, total [as P]
10% over limit
Discharged 0.11 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Copper, total [as Cu]
25% over limit
Discharged 0.0163 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total [as Cu]
11% over limit
Discharged 0.0144 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total [as Cu]
14% over limit
Discharged 0.0148 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total [as Cu]
33% over limit
Discharged 0.0173 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Copper, total [as Cu]
22% over limit
Discharged 0.0159 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Copper, total [as Cu]
10% over limit
Discharged 0.0143 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total [as Cu]
0% over limit
Discharged 0.0115 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Overdue
May 31, 2025
Phosphorus, total [as P]
20% over limit
Discharged 0.12 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Phosphorus, total [as P]
50% over limit
Discharged 0.15 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Copper, total [as Cu]
8% over limit
Discharged 0.014 mg/L against a permitted limit of 0.013 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Phosphorus, total [as P]
20% over limit
Discharged 0.12 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Phosphorus, total [as P]
10% over limit
Discharged 0.11 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Phosphorus, total [as P]
50% over limit
Discharged 0.15 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
214% over limit
Discharged 1285 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)