ST MARYS GLACIER WSD
NPDES ID: CO0023094
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Copper, potentially dissolved
158% over limit
Discharged 0.0093 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.35 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
244% over limit
Discharged 0.0093 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, potentially dissolved
140% over limit
Discharged 0.00865 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
220% over limit
Discharged 0.00865 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Copper, potentially dissolved
185% over limit
Discharged 0.0077 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
114% over limit
Discharged 0.0077 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
33% over limit
Discharged 0.0002 mg/L against a permitted limit of 0.00015 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, potentially dissolved
114% over limit
Discharged 0.0077 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
7% over limit
Discharged 0.007264 kg/d against a permitted limit of 0.00681 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
167% over limit
Discharged 0.0004 mg/L against a permitted limit of 0.00015 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
185% over limit
Discharged 0.0077 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Zinc, potentially dissolved
15% over limit
Discharged 0.053 mg/L against a permitted limit of 0.046 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
100% over limit
Discharged 0.0003 mg/L against a permitted limit of 0.00015 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
394% over limit
Discharged 0.0178 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
559% over limit
Discharged 0.0178 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
8% over limit
Discharged 0.053 mg/L against a permitted limit of 0.049 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Copper, potentially dissolved
881% over limit
Discharged 0.0265 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
233% over limit
Discharged 0.0005 mg/L against a permitted limit of 0.00015 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.45 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
636% over limit
Discharged 0.0265 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Zinc, potentially dissolved
90% over limit
Discharged 0.074 mg/L against a permitted limit of 0.039 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
40% over limit
Discharged 0.009534 kg/d against a permitted limit of 0.00681 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
4167% over limit
Discharged 0.11520001 mg/L against a permitted limit of 0.0027 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
2567% over limit
Discharged 0.004 mg/L against a permitted limit of 0.00015 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
57% over limit
Discharged 0.074 mg/L against a permitted limit of 0.047 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
3100% over limit
Discharged 0.11520001 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
223% over limit
Discharged 12.6 mg/L against a permitted limit of 3.9 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Temperature, water deg. centigrade
0% over limit
Discharged 0 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 0 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
4% over limit
Discharged 4.59 mg/L against a permitted limit of 4.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)