CAMBRIDGE, CITY OF - CAMBRIDGE WWTP
NPDES ID: ID0021806
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 6 effluent violations.
Violations
April 30, 2026
Solids, total suspended
28% over limit
Discharged 83 mg/L against a permitted limit of 65 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 77.90639935 kg/d against a permitted limit of 61.74399948 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
76% over limit
Discharged 49 % against a permitted limit of 71 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
56% over limit
Discharged 70 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
33% over limit
Discharged 60 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
18% over limit
Discharged 62.3 % against a permitted limit of 68 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, 5-day, 20 deg. C
4% over limit
Discharged 64.01399946 kg/d against a permitted limit of 61.74399948 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
45% over limit
Discharged 58 % against a permitted limit of 71 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 93.52399921 kg/d against a permitted limit of 61.74399948 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 67 mg/L against a permitted limit of 65 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
27% over limit
Discharged 57 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
41% over limit
Discharged 86.94099927 kg/d against a permitted limit of 61.74399948 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 61.5 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
24% over limit
Discharged 64 % against a permitted limit of 71 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, 5-day, percent removal
59% over limit
Discharged 49 % against a permitted limit of 68 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
131% over limit
Discharged 33 % against a permitted limit of 71 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 46 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)