Internet Explorer 11 is not supported

For optimal browsing, we recommend Chrome, Firefox or Safari browsers.

5 years

The amount of time after oil and gas drilling occurs that companies in Colorado must test the area's groundwater. Two other states require drilling companies to test groundwater, but Colorado became the first state Monday to require testing after drilling occurs.

The amount of time after oil and gas drilling occurs that companies in Colorado must test the area's groundwater. Two other states require drilling companies to test groundwater, but Colorado became the first state Monday to require testing after drilling occurs.

Caroline Cournoyer is GOVERNING's senior web editor.
Special Projects