355 CHESTNUT STREET, NEEDHAM, MA
NPDES ID: MAG912032
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: 7 effluent violations.
Violations
April 30, 2026
Copper, total recoverable
405% over limit
Discharged 0.02 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
360% over limit
Discharged 0.00046 MGD against a permitted limit of 0.0001 MGD (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
269% over limit
Discharged 0.02 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
747% over limit
Discharged 0.005 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
51% over limit
Discharged 753 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride, total recoverable
87% over limit
Discharged 431 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total dissolved [TDS]
6% over limit
Discharged 530 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride, total recoverable
40% over limit
Discharged 321 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Lead, total recoverable
19561% over limit
Discharged 0.11600001 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
640% over limit
Discharged 0.00074 MGD against a permitted limit of 0.0001 MGD (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
671% over limit
Discharged 0.11600001 mg/L against a permitted limit of 0.01504 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
1668% over limit
Discharged 0.07 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
1192% over limit
Discharged 0.07 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total dissolved [TDS]
1% over limit
Discharged 505 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
3183% over limit
Discharged 0.13000001 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
38999900% over limit
Discharged 39 MGD against a permitted limit of 0.0001 MGD (DAILY MX)
DMR, Limited - Numeric Violation
Chloride, total recoverable
15% over limit
Discharged 265 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Lead, total recoverable
747% over limit
Discharged 0.005 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
2299% over limit
Discharged 0.13000001 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
823% over limit
Discharged 0.05 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
1163% over limit
Discharged 0.05 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
59% over limit
Discharged 793 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
747% over limit
Discharged 0.005 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride, total recoverable
2% over limit
Discharged 234 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Copper, total recoverable
638% over limit
Discharged 0.04 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
917% over limit
Discharged 0.006 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
910% over limit
Discharged 0.04 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved [TDS]
30% over limit
Discharged 649 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, total dissolved [TDS]
8% over limit
Discharged 540 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
1163% over limit
Discharged 0.05 mg/L against a permitted limit of 0.00396 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Iron, total recoverable
105% over limit
Discharged 2.0500001 mg/L against a permitted limit of 1.00000005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Lead, total recoverable
747% over limit
Discharged 0.005 mg/L against a permitted limit of 0.00059 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
823% over limit
Discharged 0.05 mg/L against a permitted limit of 0.00542 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
92% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0052 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)