SANFORD TOWN OF
NPDES ID: COG591011
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: 4 effluent violations.
Violations
May 31, 2026
Arsenic, total recoverable
21900% over limit
Discharged 0.0044 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
42% over limit
Discharged 15.6 mg/L against a permitted limit of 11 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
3% over limit
Discharged 11.3 mg/L against a permitted limit of 11 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Arsenic, total recoverable
7400% over limit
Discharged 0.0015 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
21% over limit
Discharged 81.9 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2026
Arsenic, total recoverable
40900% over limit
Discharged 0.0082 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Arsenic, total recoverable
18900% over limit
Discharged 0.0038 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
E. coli
21% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 20.1 mg/L against a permitted limit of 16 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
E. coli
21% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
July 31, 2025
Arsenic, total recoverable
13900% over limit
Discharged 0.0028 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
E. coli
21% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
22% over limit
Discharged 13.4 mg/L against a permitted limit of 11 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
12400% over limit
Discharged 0.0025 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Arsenic, total recoverable
4900% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Arsenic, total recoverable
6900% over limit
Discharged 0.0014 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 12 mg/L against a permitted limit of 11 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Arsenic, total recoverable
19400% over limit
Discharged 0.0039 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
77% over limit
Discharged 73.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2025
Arsenic, total recoverable
32900% over limit
Discharged 0.0066 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 19.1 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Sulfide-hydrogen sulfide [undissociated]
245% over limit
Discharged 0.1 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
35% over limit
Discharged 20.3 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
13900% over limit
Discharged 0.0028 mg/L against a permitted limit of 0.00002 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Sulfide-hydrogen sulfide [undissociated]
1624% over limit
Discharged 0.5 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
6% over limit
Discharged 17 mg/L against a permitted limit of 16 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Sulfide-hydrogen sulfide [undissociated]
245% over limit
Discharged 0.1 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 19 mg/L against a permitted limit of 16 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Sulfide-hydrogen sulfide [undissociated]
1624% over limit
Discharged 0.5 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Flow, in conduit or thru treatment plant
355% over limit
Discharged 0.58 MGD against a permitted limit of 0.1276 MGD (30DA AVG)
DMR, Limited - Numeric Violation
Sulfide-hydrogen sulfide [undissociated]
934% over limit
Discharged 0.3 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
E. coli
21% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 2000 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
August 31, 2024
Sulfide-hydrogen sulfide [undissociated]
1624% over limit
Discharged 0.5 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Arsenic, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)
DMR, Monitor Only - Overdue
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Overdue
Sulfide-hydrogen sulfide [undissociated]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.029 mg/L (30DA AVG)
DMR, Limited - Overdue
Sulfate
0% over limit
Discharged 0 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)