Eagle County has no well-testing mandate at property transfer and none tied to septic permits — the county points well owners to the state's recommendation of annual testing for coliform bacteria, nitrates, total dissolved solids, and pH. For a sale, testing happens when the buyer's lender asks for it. The county refers owners to local and state-certified labs.

County requirement	None at sale or with OWTS permits on the county's water pages — CDPHE's annual-testing recommendation is guidance, not a mandate.
Where to test	The county refers owners to Eagle River Water & Sanitation District and state-certified laboratories; CDPHE offers free PFAS testing and well assessments.
Statewide filing	Every Colorado well sale needs the free DWR change-of-owner filing so the well permit follows the property. source ↗
County contact	Eagle County Environmental Health, (970) 328-8600, environment@eaglecounty.us.

Details to confirm with the county

We couldn't confirm the following from Eagle County's official pages. Check these with the county before you rely on them:

• Local lab pricing and turnaround — the county page lists referral options without fees.

Verified July 2026 · Source: Eagle County Environmental Health — Water & Waste Water