HENDERSON LAGOON FACILITY
NPDES ID: CO0023132
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
May 31, 2026
Cadmium, potentially dissolvd
217% over limit
Discharged 0.00073 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Cadmium, potentially dissolvd
148% over limit
Discharged 0.00057 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Zinc, potentially dissolved
78% over limit
Discharged 0.14450001 mg/L against a permitted limit of 0.081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
45% over limit
Discharged 0.0853 mg/L against a permitted limit of 0.059 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Cadmium, potentially dissolvd
378% over limit
Discharged 0.0011 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Cadmium, potentially dissolvd
591% over limit
Discharged 0.00159 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Cadmium, potentially dissolvd
235% over limit
Discharged 0.00077 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Cadmium, potentially dissolvd
343% over limit
Discharged 0.00102 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
88% over limit
Discharged 0.0357 mg/L against a permitted limit of 0.019 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
49% over limit
Discharged 0.01785 mg/L against a permitted limit of 0.012 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Zinc, potentially dissolved
400% over limit
Discharged 0.40510002 mg/L against a permitted limit of 0.081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
796% over limit
Discharged 0.00206 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
265% over limit
Discharged 0.21560001 mg/L against a permitted limit of 0.059 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Cadmium, potentially dissolvd
822% over limit
Discharged 0.00212 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Cadmium, potentially dissolvd
596% over limit
Discharged 0.0016 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Cadmium, potentially dissolvd
4509% over limit
Discharged 0.0106 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Cadmium, potentially dissolvd
622% over limit
Discharged 0.00166 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Cadmium, potentially dissolvd
2557% over limit
Discharged 0.00611 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Cadmium, potentially dissolvd
4204% over limit
Discharged 0.0099 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Cadmium, potentially dissolvd
3909% over limit
Discharged 0.00922 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Lead, potentially dissolvd
70% over limit
Discharged 0.0017 mg/L against a permitted limit of 0.001 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
2% over limit
Discharged 46 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
5335% over limit
Discharged 0.0125 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Zinc, potentially dissolved
4% over limit
Discharged 0.0843 mg/L against a permitted limit of 0.081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
3874% over limit
Discharged 0.00914 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
12% over limit
Discharged 0.066 mg/L against a permitted limit of 0.059 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Cadmium, potentially dissolvd
1735% over limit
Discharged 0.00422 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Cadmium, potentially dissolvd
1374% over limit
Discharged 0.00339 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Cadmium, potentially dissolvd
1104% over limit
Discharged 0.00277 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Cadmium, potentially dissolvd
3626% over limit
Discharged 0.00857 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
18% over limit
Discharged 0.0954 mg/L against a permitted limit of 0.081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
20% over limit
Discharged 0.0707 mg/L against a permitted limit of 0.059 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Zinc, potentially dissolved
1103% over limit
Discharged 0.97450005 mg/L against a permitted limit of 0.081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
756% over limit
Discharged 0.50530002 mg/L against a permitted limit of 0.059 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
201% over limit
Discharged 0.0361 mg/L against a permitted limit of 0.012 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Cadmium, potentially dissolvd
1783% over limit
Discharged 0.00433 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, potentially dissolved
279% over limit
Discharged 0.0721 mg/L against a permitted limit of 0.019 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
Cadmium, potentially dissolvd
600% over limit
Discharged 0.00161 mg/L against a permitted limit of 0.00023 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)