MILLBORO STP
NPDES ID: VA0073156
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: 4 permit schedule violations.
Violations
March 31, 2026
Solids, total suspended
31% over limit
Discharged 39.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 20 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 1.45 kg/d against a permitted limit of 3.8 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 4.9 kg/d against a permitted limit of 5.7 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 67.8 mg/L against a permitted limit of 30 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, carbonaceous [5 day, 20 C]
26% over limit
Discharged 4.78 kg/d against a permitted limit of 3.8 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
212% over limit
Discharged 17.8 kg/d against a permitted limit of 5.7 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
November 30, 2025
E. coli
1523% over limit
Discharged 2045 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli
Limit violation
Discharged 202 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
12% over limit
Discharged 6.4 kg/d against a permitted limit of 5.7 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
193% over limit
Discharged 88 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
96% over limit
Discharged 88 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2024
BOD, carbonaceous [5 day, 20 C]
55% over limit
Discharged 5.9 kg/d against a permitted limit of 3.8 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
30% over limit
Discharged 26 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
261% over limit
Discharged 20.6 kg/d against a permitted limit of 5.7 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
67% over limit
Discharged 50 mg/L against a permitted limit of 30 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2024
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 50 mg/L against a permitted limit of 30 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 4 kg/d against a permitted limit of 5.7 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 1.2 kg/d against a permitted limit of 3.8 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 39.5 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
Limit violation
Discharged 21 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
128% over limit
Discharged 25.1 mg/L against a permitted limit of 11 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)