SANDY HOOK WASTEWATER TREATMENT FACILITY
NPDES ID: MD0064530
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.
Violations
March 31, 2026
Nitrogen, ammonia total [as N]
21% over limit
Discharged 0.1816 kg/d against a permitted limit of 0.14982 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
137% over limit
Discharged 106.5 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
266% over limit
Discharged 22.7 mg/L against a permitted limit of 6.2 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
542% over limit
Discharged 12.2 mg/L against a permitted limit of 1.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
48% over limit
Discharged 44.3 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
112% over limit
Discharged 0.3178 kg/d against a permitted limit of 0.14982 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1247% over limit
Discharged 25.6 mg/L against a permitted limit of 1.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
447% over limit
Discharged 33.9 mg/L against a permitted limit of 6.2 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
69% over limit
Discharged 10.5 mg/L against a permitted limit of 6.2 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 4.8 mg/L against a permitted limit of 1.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
23% over limit
Discharged 55.4 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
5% over limit
Discharged 47.4 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
14% over limit
Discharged 51.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 32.5 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
153% over limit
Discharged 4.8 mg/L against a permitted limit of 1.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
50% over limit
Discharged 9.3 mg/L against a permitted limit of 6.2 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
13% over limit
Discharged 1.8 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)