Castle Rock partners with Tallgrass for water supply infrastructure expansion

The Douglas County Water Commission meeting on May 19, 2025, focused on significant developments in local water supply management and infrastructure projects. Key discussions included updates on water rights, infrastructure partnerships, and future water supply strategies.

One of the main topics was the recent adjudication of a water court case that will enable the county to utilize a previously untapped water supply. This legal decision is expected to enhance the region's water resources significantly. The commission is currently in the process of building the first phase of infrastructure in Castle Rock, collaborating with Tallgrass, a company owned by BlackRock. This public-private partnership aims to facilitate water leasing to oil and gas interests in Weld County.

The commission outlined plans to collect and treat water through agreements with the East Cherry Creek Valley Water and Sanitation Districts, which operates a treatment plant near Bar Lake. The treated water will be transported via the North South pipeline back to Castle Rock, with most of the necessary piping already in place. The final leg of this infrastructure is set to be constructed in Weld County, where the county holds water rights.

Additionally, the meeting touched on the long-term Platte Valley Water Partnership project, which is still in the water court process. The commission anticipates that water rights for this project will be finalized by the end of 2024, with an estimated 8,000 acre-feet of water supply expected, of which about 3,000 acre-feet will be on a firm basis.

Overall, the discussions highlighted the county's proactive approach to managing water resources and infrastructure, ensuring a sustainable supply for the future. The commission's ongoing efforts reflect a commitment to addressing the region's water needs amid growing demands.