NORTHFIELD
NPDES ID: VT0100242
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: 2 effluent violations.
Violations
April 30, 2026
E. coli, thermotol, MF, MTEC
160% over limit
Discharged 200 MPN/100mL against a permitted limit of 77 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
28% over limit
Discharged 0.0345 mg/L against a permitted limit of 0.027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Copper, total [as Cu]
24% over limit
Discharged 0.03355 mg/L against a permitted limit of 0.027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
9% over limit
Discharged 0.87 mg/L against a permitted limit of 0.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Copper, total [as Cu]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.10442 kg/d (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.16344 kg/d (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 kg/d against a permitted limit of 170.24999857 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 0 % against a permitted limit of 85 % (MO MIN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.027 mg/L (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 kg/d against a permitted limit of 113.49999905 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 170.24999857 kg/d (WKLY AVG)
DMR, Limited - Overdue
Copper, total [as Cu]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.048 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 0 % against a permitted limit of 85 % (MO MIN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.8 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
E. coli, thermotol, MF, MTEC
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 77 MPN/100mL (INST MAX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 113.49999905 kg/d (MO AVG)
DMR, Limited - Overdue
December 31, 2025
Copper, total [as Cu]
41% over limit
Discharged 0.03815 mg/L against a permitted limit of 0.027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Phosphorus, total [as P]
19% over limit
Discharged 0.95 mg/L against a permitted limit of 0.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total [as Cu]
442% over limit
Discharged 0.26 mg/L against a permitted limit of 0.048 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli, thermotol, MF, MTEC
97% over limit
Discharged 152 MPN/100mL against a permitted limit of 77 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
March 31, 2025
E. coli, thermotol, MF, MTEC
6% over limit
Discharged 82 MPN/100mL against a permitted limit of 77 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
December 31, 2024
Phosphorus, total [as P]
41% over limit
Discharged 1.06658601 kg/d against a permitted limit of 0.75392001 kg/d (ANNL TOT)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
24% over limit
Discharged 95.5 MPN/100mL against a permitted limit of 77 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
November 30, 2024
Phosphorus, total [as P]
21% over limit
Discharged 0.97 mg/L against a permitted limit of 0.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)