TWIN BUTTES WATER SYSTEM
NPDES ID: NDDW0003I
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
Aluminum, total [as Al]
308% over limit
Discharged 0.35493002 mg/L against a permitted limit of 0.087 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Aluminum, total [as Al]
85% over limit
Discharged 1.39054007 mg/L against a permitted limit of 0.75000004 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
1498% over limit
Discharged 1.39054007 mg/L against a permitted limit of 0.087 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Aluminum, total [as Al]
75% over limit
Discharged 0.15200001 mg/L against a permitted limit of 0.087 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Aluminum, total [as Al]
31% over limit
Discharged 0.11400001 mg/L against a permitted limit of 0.087 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.14 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2024
Chlorine, total residual
82% over limit
Discharged 0.02 mg/L against a permitted limit of 0.011 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
5% over limit
Discharged 0.02 mg/L against a permitted limit of 0.019 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 16, 2026 (7 hours ago)