55 BROADWAY, CAMBRIDGE, MA - DEMOLITION
NPDES ID: MAG912187
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: 6 effluent violations.
Violations
May 31, 2026
Mercury, total recoverable
179% over limit
Discharged 0.00206 mg/L against a permitted limit of 0.000739 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride, total recoverable
196% over limit
Discharged 680 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Copper, total recoverable
47% over limit
Discharged 0.01056 mg/L against a permitted limit of 0.00717341 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
1% over limit
Discharged 0.01056 mg/L against a permitted limit of 0.01043431 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Lead, total recoverable
217% over limit
Discharged 0.0045 mg/L against a permitted limit of 0.00141861 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
84% over limit
Discharged 0.01029 mg/L against a permitted limit of 0.0056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Benzo[a]pyrene
56% over limit
Discharged 0.000109 mg/L against a permitted limit of 0.00007 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Total Group I Polycyclic Aromatic Hydrocarbons
34% over limit
Discharged 0.000468 mg/L against a permitted limit of 0.00035 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Benzo[a]anthracene
148% over limit
Discharged 0.000124 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Benzo[a]pyrene
4543% over limit
Discharged 0.00325 mg/L against a permitted limit of 0.00007 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Total Group I Polycyclic Aromatic Hydrocarbons
5026% over limit
Discharged 0.01794 mg/L against a permitted limit of 0.00035 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Benzo[a]anthracene
8360% over limit
Discharged 0.00423 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Dibenz[a,h]anthracene
800% over limit
Discharged 0.00045 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Benzo[k]fluoranthene
96% over limit
Discharged 0.00135 mg/L against a permitted limit of 0.00069 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride, total recoverable
18% over limit
Discharged 272 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Indeno[1,2,3-cd]pyrene
2643% over limit
Discharged 0.00192 mg/L against a permitted limit of 0.00007 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Benzo[a]anthracene
2% over limit
Discharged 0.000051 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Lead, total recoverable
51% over limit
Discharged 0.00214 mg/L against a permitted limit of 0.00141861 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride, total recoverable
46% over limit
Discharged 336 mg/L against a permitted limit of 230 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Lead, total recoverable
123% over limit
Discharged 0.00317 mg/L against a permitted limit of 0.00141861 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Benzo[a]pyrene
50% over limit
Discharged 0.000105 mg/L against a permitted limit of 0.00007 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Benzo[a]anthracene
86% over limit
Discharged 0.000093 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Copper, total recoverable
8% over limit
Discharged 0.00775 mg/L against a permitted limit of 0.00717341 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
41% over limit
Discharged 0.00787 mg/L against a permitted limit of 0.0056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Arsenic, total recoverable
74% over limit
Discharged 0.00976 mg/L against a permitted limit of 0.0056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Benzo[a]anthracene
36% over limit
Discharged 0.000068 mg/L against a permitted limit of 0.00005 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Lead, total recoverable
334% over limit
Discharged 0.00616 mg/L against a permitted limit of 0.00141861 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
116567% over limit
Discharged 35000 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Arsenic, total recoverable
39% over limit
Discharged 0.0078 mg/L against a permitted limit of 0.0056 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)