TIMBER RIDGE SCHOOL
NPDES ID: VA0087424
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.
Violations
May 31, 2026
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 19 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 19 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 3.3 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 3.3 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, carbonaceous [5 day, 20 C]
29% over limit
Discharged 22 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
47% over limit
Discharged 4.7 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
47% over limit
Discharged 4.7 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
40% over limit
Discharged 62.8 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
53% over limit
Discharged 77 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
35% over limit
Discharged 23 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
Limit violation
Discharged 94 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Solids, total suspended
109% over limit
Discharged 62.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 4.5 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 4.5 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, carbonaceous [5 day, 20 C]
19% over limit
Discharged 1.55 kg/d against a permitted limit of 1.3 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
329% over limit
Discharged 73 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
181% over limit
Discharged 73 mg/L against a permitted limit of 26 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
444% over limit
Discharged 17.4 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
118% over limit
Discharged 37 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
22% over limit
Discharged 36.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
444% over limit
Discharged 17.4 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
42% over limit
Discharged 37 mg/L against a permitted limit of 26 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
28% over limit
Discharged 38.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 1.43 kg/d against a permitted limit of 1.3 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
784% over limit
Discharged 28.3 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
138% over limit
Discharged 62 mg/L against a permitted limit of 26 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Chlorine, total residual
1839% over limit
Discharged 0.19 mg/L against a permitted limit of 0.0098 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
784% over limit
Discharged 28.3 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
265% over limit
Discharged 62 mg/L against a permitted limit of 17 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
1900% over limit
Discharged 0.16 mg/L against a permitted limit of 0.008 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
3650% over limit
Discharged 0.3 mg/L against a permitted limit of 0.008 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
8471% over limit
Discharged 0.84 mg/L against a permitted limit of 0.0098 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
803% over limit
Discharged 28.9 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 4.2 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
803% over limit
Discharged 28.9 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2025
Oxygen, dissolved [DO]
36% over limit
Discharged 4.5 mg/L against a permitted limit of 7 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
225% over limit
Discharged 10.4 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
138% over limit
Discharged 7.6 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
313% over limit
Discharged 13.2 mg/L against a permitted limit of 3.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
313% over limit
Discharged 13.2 mg/L against a permitted limit of 3.2 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2024
E. coli
Limit violation
Discharged 45 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)