MONARCH SKI AREA
NPDES ID: CO0031399
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: 2 effluent violations.
Violations
June 30, 2026
Nitrogen, inorganic total
410% over limit
Discharged 51 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Chloride [as Cl]
50% over limit
Discharged 150 mg/L against a permitted limit of 100 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, inorganic total
914% over limit
Discharged 101.4 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
70% over limit
Discharged 170 mg/L against a permitted limit of 100 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Chloride [as Cl]
60% over limit
Discharged 160 mg/L against a permitted limit of 100 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Chloride [as Cl]
40% over limit
Discharged 140 mg/L against a permitted limit of 100 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)