Summit County uses the same framing as its neighbors: 'A lender may require that a well be inspected for the purposes of real estate transaction' — there's no county mandate at sale. Summit County Environmental Health tests well water for nitrates and coliform bacteria, provides sterile sample bottles, and accepts samples Monday through Wednesday during business hours.

County requirement	None at sale — well inspection and testing happen when the buyer's lender requires them, per the county's drinking-water page.
County testing	Environmental Health tests for nitrates and coliform bacteria; sterile sample bottles provided; samples accepted Monday–Wednesday during business hours; fees per the current fee schedule.
Fuller panels	For contaminants beyond coliform and nitrate, the county refers owners to state (CDPHE) water testing laboratories.
Statewide filing	Every Colorado well sale needs the free DWR change-of-owner filing so the well permit follows the property. source ↗

Details to confirm with the county

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

• Exact county testing fees — the page points to the fee schedule rather than listing amounts.

Verified July 2026 · Source: Summit County Public Health — Drinking Water