NELSON COUNTY REGIONAL STP
NPDES ID: VA0089729
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Chlorine, total residual
173% over limit
Discharged 0.03 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
150% over limit
Discharged 0.03 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
95% over limit
Discharged 0.03 mg/L against a permitted limit of 0.6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
169% over limit
Discharged 4.85 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
95% over limit
Discharged 0.03 mg/L against a permitted limit of 0.6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Chlorine, total residual
173% over limit
Discharged 0.03 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
650% over limit
Discharged 0.09 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
224% over limit
Discharged 8.1 mg/L against a permitted limit of 2.5 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
150% over limit
Discharged 0.03 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
173% over limit
Discharged 0.03 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
95% over limit
Discharged 0.03 mg/L against a permitted limit of 0.6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, suspended percent removal
43% over limit
Discharged 78.6 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
95% over limit
Discharged 0.03 mg/L against a permitted limit of 0.6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Chlorine, total residual
173% over limit
Discharged 0.03 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
150% over limit
Discharged 0.03 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 2.32 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
483% over limit
Discharged 0.07 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 33 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
95% over limit
Discharged 0.03 mg/L against a permitted limit of 0.6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Chlorine, total residual
173% over limit
Discharged 0.03 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
456% over limit
Discharged 3.28 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
339% over limit
Discharged 1.93 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
52% over limit
Discharged 45.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
94% over limit
Discharged 19.43 mg/L against a permitted limit of 10 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
87% over limit
Discharged 13.09 mg/L against a permitted limit of 7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
82% over limit
Discharged 0.02 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1852% over limit
Discharged 8.59 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2639% over limit
Discharged 16.16 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 45.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
67% over limit
Discharged 0.02 mg/L against a permitted limit of 0.012 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
88% over limit
Discharged 13.16 mg/L against a permitted limit of 7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2956% over limit
Discharged 18.03 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
42% over limit
Discharged 42.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
32% over limit
Discharged 13.16 mg/L against a permitted limit of 10 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2959% over limit
Discharged 13.46 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
1175% over limit
Discharged 7.52 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1241% over limit
Discharged 5.9 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
13% over limit
Discharged 11.33 mg/L against a permitted limit of 10 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
32% over limit
Discharged 9.21 mg/L against a permitted limit of 7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
BOD, carbonaceous [5 day, 20 C]
119% over limit
Discharged 21.93 mg/L against a permitted limit of 10 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
920% over limit
Discharged 6.02 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
352% over limit
Discharged 1.99 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
8% over limit
Discharged 8.94 kg/d against a permitted limit of 8.3 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
13% over limit
Discharged 7.88 mg/L against a permitted limit of 7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
218% over limit
Discharged 7.94 mg/L against a permitted limit of 2.5 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
110% over limit
Discharged 3.78 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
24% over limit
Discharged 3.1 mg/L against a permitted limit of 2.5 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Hardness, total [as CaCO3]
21% over limit
Discharged 79 mg/L against a permitted limit of 100 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
244% over limit
Discharged 6.2 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Hardness, total [as CaCO3]
30% over limit
Discharged 70 mg/L against a permitted limit of 100 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 34.31 kg/d against a permitted limit of 25 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
228% over limit
Discharged 8.2 mg/L against a permitted limit of 2.5 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
445% over limit
Discharged 2.4 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
239% over limit
Discharged 2 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
1171% over limit
Discharged 7.5 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
34% over limit
Discharged 0.59 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
195% over limit
Discharged 1.3 mg/L against a permitted limit of 0.44 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
431% over limit
Discharged 3.13 mg/L against a permitted limit of 0.59 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (22 days ago)