COLTON STP
NPDES ID: WA0023175
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: 7 effluent violations, 13 permit schedule violations.
Violations
April 30, 2026
Solids, total suspended
43% over limit
Discharged 64.5667 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 50.7333 mg/L against a permitted limit of 45 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 73 mg/L against a permitted limit of 65 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, percent removal [total]
60% over limit
Discharged 44 % against a permitted limit of 65 % (MO AV MN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 8.99 SU against a permitted limit of 8.5 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 21.39552162 kg/d against a permitted limit of 21.33799982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)