WILLIAMSBURG CITY OF STP
NPDES ID: IA0033880
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: 3 effluent violations.
Violations
April 30, 2026
Nitrogen, ammonia total [as N]
233% over limit
Discharged 4.991111 mg/L against a permitted limit of 1.5 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
66% over limit
Discharged 9.51041008 kg/d against a permitted limit of 5.72039995 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
38% over limit
Discharged 21.7 mg/L against a permitted limit of 15.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
20% over limit
Discharged 54 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
214% over limit
Discharged 10.68222 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 18.6 mg/L against a permitted limit of 14.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 15.23829195 kg/d against a permitted limit of 12.80279989 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
E. coli
18% over limit
Discharged 149.1421 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
2% over limit
Discharged 2.3375 mg/L against a permitted limit of 2.3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)