NORTH HARFORD HIGH SCHOOL WWTP
NPDES ID: MD0023281
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: 2 effluent violations.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
628% over limit
Discharged 39.3 mg/L against a permitted limit of 5.4 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
483% over limit
Discharged 31.5 mg/L against a permitted limit of 5.4 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
79% over limit
Discharged 18.4 mg/L against a permitted limit of 10.3 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
6% over limit
Discharged 0.81719999 kg/d against a permitted limit of 0.77179999 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
159% over limit
Discharged 10.1 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
January 31, 2025
E. coli
317% over limit
Discharged 525 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli
516% over limit
Discharged 776 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
137% over limit
Discharged 12.8 mg/L against a permitted limit of 5.4 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.4 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (10 hours ago)