El Paso County doesn't require a well test to sell: the county lab itself says that in a real estate transaction 'it is the lender who determines what testing is required.' What the county does offer is testing — El Paso County Public Health's laboratory runs bacteriological (potability) and inorganic anion tests (nitrate, fluoride and others) for private well owners.

County requirement	None at sale. In the county's own words: 'In a real estate transaction it is the lender who determines what testing is required.'
County lab services	Bacteriological tests to determine potability, plus inorganic anion tests (nitrate, fluoride, and others), available to private well owners and public systems.
Owner responsibility	The Safe Drinking Water Act doesn't cover private wells — periodic testing is the homeowner's responsibility, per the county.
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 El Paso County's official pages. Check these with the county before you rely on them:

• Current lab fee amounts — the county references its fee page rather than publishing amounts on the testing page.

Verified July 2026 · Source: El Paso County Public Health — Water Testing