ELECTRIC BOAT CORPORATION
NPDES ID: CT0003824
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
This quarter: 2 effluent violations, 4 single-event violations.
Violations
June 30, 2026
Flow, maximum during 24 hr period
43% over limit
Discharged 0.0264 MGD against a permitted limit of 0.0185 MGD (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Flow, maximum during 24 hr period
43% over limit
Discharged 0.0264 MGD against a permitted limit of 0.0185 MGD (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total [as Cu]
0% over limit
Discharged 0.381 kg/d against a permitted limit of 4.459 kg/d (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.381 kg/d against a permitted limit of 2.223 kg/d (MO AVG)
DMR, Limited - Overdue
January 31, 2026
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.8 SU (INST MIN)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.15900001 mg/L (DAILY MX)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Oxidants, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (INST MAX)
DMR, Limited - Overdue
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.069 mg/L (MO AVG)
DMR, Limited - Overdue
LC50 Static 48Hr Acute Cyprinodon variegatus
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
December 31, 2025
Oxidants, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.15900001 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, maximum during 24 hr period
0% over limit
Discharged 0.00792 MGD against a permitted limit of 0.02592 MGD (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.8 SU (INST MIN)
DMR, Limited - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.242 kg/d against a permitted limit of 4.459 kg/d (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (INST MAX)
DMR, Limited - Overdue
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
LC50 Static 48Hr Acute Cyprinodon variegatus
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.069 mg/L (MO AVG)
DMR, Limited - Overdue
Zinc, total [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0.152 kg/d against a permitted limit of 2.223 kg/d (MO AVG)
DMR, Limited - Overdue
September 30, 2025
Flow, maximum during 24 hr period
43% over limit
Discharged 0.0264 MGD against a permitted limit of 0.0185 MGD (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Flow, maximum during 24 hr period
43% over limit
Discharged 0.0263999 MGD against a permitted limit of 0.0185 MGD (DAILY MX)
DMR, Limited - Numeric Violation
Flow, maximum during 24 hr period
43% over limit
Discharged 0.0263999 MGD against a permitted limit of 0.0185 MGD (DAILY MX)
DMR, Limited - Numeric Violation
Flow, maximum during 24 hr period
25% over limit
Discharged 34.58001491 MGD against a permitted limit of 27.73157393 MGD (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
pH, maximum
0% over limit
Discharged 8.65 SU against a permitted limit of 8.5 SU (INST MAX)
DMR, Limited - Numeric Violation
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)
0% over limit
Discharged 100 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)
0% over limit
Discharged 100 % against a permitted limit of 0 % (MAXIMUM)
DMR, Monitor Only - Overdue
NOEC Sub-Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatus
0% over limit
Discharged 100 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
NOEC Lethal Static Renewal 7 Day Chronic Cyprinodeon variegatus
0% over limit
Discharged 100 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
June 30, 2025
Oil & Grease
47% over limit
Discharged 14.7 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
pH
0% over limit
Discharged 9.58 SU against a permitted limit of 9.5 SU (INST MAX)
DMR, Limited - Numeric Violation
February 28, 2025
Flow, maximum during 24 hr period
29% over limit
Discharged 35.68844291 MGD against a permitted limit of 27.73157393 MGD (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
pH
0% over limit
Discharged 9.71 SU against a permitted limit of 9.5 SU (INST MAX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
52% over limit
Discharged 0.105 mg/L against a permitted limit of 0.069 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Flow, maximum during 24 hr period
10% over limit
Discharged 30.47415992 MGD against a permitted limit of 27.73157393 MGD (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
pH
0% over limit
Discharged 6.23 SU against a permitted limit of 6.8 SU (INST MIN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.2 SU against a permitted limit of 6.8 SU (INST MIN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 17, 2026 (8 hours ago)