MOUNTAIN HOME WTP
NPDES ID: ARG640094
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
June 30, 2026
Aluminum, dissolved [as Al]
285% over limit
Discharged 7.7 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, dissolved [as Al]
670% over limit
Discharged 7.7 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
120% over limit
Discharged 44 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Aluminum, dissolved [as Al]
60% over limit
Discharged 1.6 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
pH
0% over limit
Discharged 7.11 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, dissolved [as Al]
0% over limit
Discharged 0.59 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Overdue
Aluminum, dissolved [as Al]
0% over limit
Discharged 0.59 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.11 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Solids, total suspended
110% over limit
Discharged 42 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
110% over limit
Discharged 42 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Aluminum, dissolved [as Al]
0% over limit
Discharged 0.03 mg/L against a permitted limit of 2 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Overdue
Aluminum, dissolved [as Al]
0% over limit
Discharged 0.03 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.08 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.08 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
December 31, 2024
Aluminum, dissolved [as Al]
75% over limit
Discharged 1.75 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
3173% over limit
Discharged 0.36 mg/L against a permitted limit of 0.011 mg/L (INST MAX)
DMR, Limited - Numeric Violation
September 30, 2024
Chlorine, total residual
3173% over limit
Discharged 0.36 mg/L against a permitted limit of 0.011 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Aluminum, dissolved [as Al]
75% over limit
Discharged 1.75 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (9 hours ago)