TOWN OF COLONIAL BEACH WASTEWATER TREATMENT PLANT
NPDES ID: VA0026409
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: 1 effluent violation, 1 single-event violation.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
15% over limit
Discharged 1.87 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
151% over limit
Discharged 2.99 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
284% over limit
Discharged 6.22 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
791% over limit
Discharged 14.44 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
664% over limit
Discharged 9.09 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Enterococci
Limit violation
Discharged 208 MPN/100mL against a permitted limit of 35 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
745% over limit
Discharged 1690 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
98% over limit
Discharged 3.2 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, Total As N
120% over limit
Discharged 6.61 mg/L against a permitted limit of 3 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Enterococci
31% over limit
Discharged 46 MPN/100mL against a permitted limit of 35 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 127 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
May 31, 2025
Enterococci
86% over limit
Discharged 65 MPN/100mL against a permitted limit of 35 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 80 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
85% over limit
Discharged 2.2 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
151% over limit
Discharged 4.06 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
415% over limit
Discharged 8.35 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
425% over limit
Discharged 6.25 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
839% over limit
Discharged 11.17 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
720% over limit
Discharged 13.28 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, Total As N
199% over limit
Discharged 8.98 mg/L against a permitted limit of 3 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
417% over limit
Discharged 6.15 mg/L against a permitted limit of 1.19 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
315% over limit
Discharged 6.72 mg/L against a permitted limit of 1.62 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Oxygen, dissolved [DO]
9% over limit
Discharged 5.9 mg/L against a permitted limit of 6.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)