TWIN VALLEY JT SCHOOL
NPDES ID: PA0031631
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: 4 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
97% over limit
Discharged 55.2 mg/L against a permitted limit of 28 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
214% over limit
Discharged 44 mg/L against a permitted limit of 14 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
3117% over limit
Discharged 965 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
45% over limit
Discharged 2.9 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3067% over limit
Discharged 1900 mg/L against a permitted limit of 60 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
15% over limit
Discharged 4.61 mg/L against a permitted limit of 4 mg/L (INST MAX)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
10% over limit
Discharged 33 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chlorine, total residual
3% over limit
Discharged 1.65 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
40% over limit
Discharged 0.7 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
20% over limit
Discharged 0.6 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.12 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
40% over limit
Discharged 0.7 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)