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Commissioners approve Henderson Mill 1041 permit for wastewater treatment plant
Summary
The Board approved Climax/ Henderson Mill's 1041 permit to construct a gravity-fed water-treatment plant that will treat surplus process water and discharge to the Williams Fork River under a new CDPHE permit. Staff and consultants recommended approval after technical review; construction is expected to start in early April with operations targeted for mid—late 2027.
Climax (Henderson Mill) received board approval to build a water-treatment plant at the Henderson Mill site after staff and external consultants reviewed a final Colorado Department of Public Health and Environment (CDPHE) discharge permit.
Community Development staff explained the plant will treat up to roughly 600 gallons per minute of surplus process water and discharge it to the Williams Fork River via an existing pipeline, subject to CDPHE effluent limits. Miguel Hamra, Henderson environmental manager, described the project as a "voluntary and proactive measure to responsibly and safely manage that water." The company said the facility is gravity-fed and includes automatic controls to recirculate pretreated water back into the process if alarms trigger.
Consultants reviewed the draft and final state permit, noted two typographical errors in the issued permit (to be corrected administratively by the division) and advised that the final CDPHE permit satisfies county criterion 1(d). Staff recommended removing redundant county conditions tied to state permitting. After discussion, commissioners voted to approve the 1041 permit with modified conditions and directed staff to prepare the formal resolution for signature. Construction will begin later this month and the company projected the plant will be treating and discharging water by mid-to-late 2027.
