Backflow testers approved by the City of Columbus

If your water bill comes from Columbus or Del-Co and you have a backflow preventer, it has to be tested once a year by a tester on the utility’s list. This is that list, searchable, with phone numbers.

List updated from City of Columbus, Oct 16 2026 (valid through Oct 30). Del-Co list from Mar 13 2026. 166 companies on the City lists, 148 on Del-Co’s.