By Laurie Blake • laurie.blake@startribune.com
In an era of rising nervousness about water supplies, Dakota County is increasingly eyeing its groundwater reserves.
. It's one of the state's most groundwater-dependent counties.Homes, farms and businesses rely mainly on water brought up by wells from underground layers of rock. Only , along with two microsuburbs, Lilydale and Mendota, use Mississippi River water."Four Dakota County cities — Eagan, Apple Valley, Lakeville, and Burnsville — are among the top 20 municipal groundwater users in the state,'' said Jill Trescott, the county's groundwater protection supervisor. "We are also the county that is the second-largest user of groundwater for crop irrigation."
So far, groundwater dependence has not been cause for alarm. Minnesota is water rich compared with many states, Trescott said."We have water that goes back to the glacial era and we get lots of snow and rain which is one of the reasons we have been able to take it for granted for so long."
But because Dakota County's population is growing and rainfall patterns are changing, communities are trying to plan for a range of future situations so they can be prepared regardless of what happens, Trescott said. She
"Cities are working together to identify ways to make the long-term water supply more secure. They are looking for ways to connect with each other in case of emergencies.''
Rosemount, Inver Grove Heights and Hastings are considering forming a groundwater consortium similar to one that Savage and Burnsville have established, Trescott said.
Burnsville decided to capture underground water brought to the surface at a stone quarry and use it to provide water to Savage as well."It was water that was just going to waste that is now being pumped out of the quarry and being put to good use. That is the kind of innovation that every community is going to have to look for as an option to consider for the future.''