HAMPSTEAD WWTP
NPDES ID: MD0022446
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
February 28, 2026
Nitrogen, ammonia total [as N]
388% over limit
Discharged 7.8 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
191% over limit
Discharged 22.42759981 kg/d against a permitted limit of 7.71799994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
128% over limit
Discharged 8.26279993 kg/d against a permitted limit of 3.63199997 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
497% over limit
Discharged 20.3 mg/L against a permitted limit of 3.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
124% over limit
Discharged 8.12659993 kg/d against a permitted limit of 3.63199997 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
81% over limit
Discharged 13.98319988 kg/d against a permitted limit of 7.71799994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
406% over limit
Discharged 8.1 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
285% over limit
Discharged 13.1 mg/L against a permitted limit of 3.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (ANNL TOT)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (ANNL TOT)
DMR, Monitor Only - Overdue
Flow, total
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (ANNL TOT)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
121% over limit
Discharged 7.5 mg/L against a permitted limit of 3.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
169% over limit
Discharged 4.3 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 3.72279997 kg/d against a permitted limit of 3.63199997 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
7% over limit
Discharged 9.71559992 kg/d against a permitted limit of 9.07999992 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
88% over limit
Discharged 7.5 mg/L against a permitted limit of 4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
328% over limit
Discharged 17.1 mg/L against a permitted limit of 4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
500% over limit
Discharged 12 mg/L against a permitted limit of 2 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
81% over limit
Discharged 16.38939986 kg/d against a permitted limit of 9.07999992 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
174% over limit
Discharged 12.4395999 kg/d against a permitted limit of 4.53999996 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
92% over limit
Discharged 8.71679993 kg/d against a permitted limit of 4.53999996 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
128% over limit
Discharged 20.65699983 kg/d against a permitted limit of 9.07999992 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
400% over limit
Discharged 20 mg/L against a permitted limit of 4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
440% over limit
Discharged 10.8 mg/L against a permitted limit of 2 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)