NORTHERN HIGH SCHOOL WWTP
NPDES ID: MD0052167
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: 3 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
47% over limit
Discharged 5.3 mg/L against a permitted limit of 3.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
31% over limit
Discharged 0.44492 kg/d against a permitted limit of 0.3405 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
1% over limit
Discharged 4.31299996 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, suspended percent removal
85% over limit
Discharged 72.254 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
125% over limit
Discharged 6.44225995 kg/d against a permitted limit of 2.86019998 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
107% over limit
Discharged 8.81667993 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
61% over limit
Discharged 6.87809994 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
167% over limit
Discharged 9.6 mg/L against a permitted limit of 3.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
100% over limit
Discharged 0.68099999 kg/d against a permitted limit of 0.3405 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
133% over limit
Discharged 8.4 mg/L against a permitted limit of 3.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 6.26973995 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 0.37228 kg/d against a permitted limit of 0.3405 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 4.1 mg/L against a permitted limit of 3.7 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
14% over limit
Discharged 4.88049996 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Coliform, fecal general
388% over limit
Discharged 68.3 MPN/100mL against a permitted limit of 14 MPN/100mL (MO MED)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
20% over limit
Discharged 5.11657996 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
44% over limit
Discharged 6.12445995 kg/d against a permitted limit of 4.26759996 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)