Colorado water trial to decide San Luis Valley aquifer plan

October 4, 2026 at 01:55 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

A Colorado water court trial this summer examined a proposed groundwater management plan for the San Luis Valley, where the aquifer reached a record low in August. The plan would sharply increase pumping fees for thousands of well users, potentially forcing some farmers out of business. A ruling is expected later this year, with an appeal to the Colorado Supreme Court likely.

Key Facts

The San Luis Valley aquifer reached a record low in August after decades of overpumping and drought.
Groundwater provides roughly 800,000 acre-feet of irrigation water annually in the valley.
The Rio Grande Water Conservation District has spent about $100 million over 14 years to reduce groundwater pumping, which fell by about one-third over the past decade.
Snowmelt rates in the Rio Grande headwaters decreased by 20 percent per decade from 1984 to 2017, according to the U.S. Geological Survey.
The proposed plan would dramatically increase fees for thousands of well users, and state engineers could shut down all wells if restoration goals are not met soon.

The Groundwater Plan

The proposed groundwater management plan would dramatically increase the fee thousands of well users pay for pumping from the aquifer. Some producers say the additional cost will put them out of business, while failure to meet aquifer restoration goals could lead state engineers to shut down the valley's wells entirely. The plan was the subject of a weeks-long Colorado water court trial this summer, with a ruling expected later this year. Judge Michael Gonzales said the case is likely to be appealed to the Colorado Supreme Court regardless of the outcome.

Aquifer Decline

After decades of overpumping and persistent drought conditions, the San Luis Valley aquifer reached a record low in August. State Sen. Cleave Simpson, a fourth-generation valley farmer and general manager of the Rio Grande Water Conservation District, estimates the district has spent roughly $100 million over 14 years trying to reduce groundwater pumping. Groundwater pumping fell by about one-third over the past decade, but officials say the aquifer's long-term storage is getting worse. Snowmelt rates in the Rio Grande headwaters decreased by 20 percent per decade from 1984 to 2017, according to the U.S. Geological Survey. Fourth-generation farmer Michael Jones said his irrigation ditch used to flow until September in his grandfather's time, but now often runs dry by July.