UPPER BLACKSTONE WPAD
NPDES ID: MA0102369
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 3 effluent violations.
Violations
May 31, 2026
Phosphorus, total [as P]
120% over limit
Discharged 0.22 mg/L against a permitted limit of 0.1 mg/L (ROLL AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
90% over limit
Discharged 0.19 mg/L against a permitted limit of 0.1 mg/L (ROLL AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, total [as N]
5% over limit
Discharged 6.31 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)
Source:EPA ECHO facility report