Backflow testing for Del-Co water customers
A non-profit water company serving a large stretch of Delaware, Morrow, Union and Marion counties, including most of the area north of Columbus where city water does not reach. Del-Co publishes a searchable directory of its approved backflow testers.
What Del-Co requires
- How often
- Annually
- Approved tester list
- Del-Co keeps its own list of accepted testers.
- How the result is handled
- Del-Co keeps a public directory of approved backflow testers and expects testing by a tester on it. Lawn irrigation systems specifically must have an approved testable assembly, tested yearly.
- If it is not done
- Keeping the assembly tested and operable is the customer's responsibility as a condition of service.
Confirmed with Del-Co on 2026-10-05 · their backflow page. Requirements change — we re-confirm before every test.
What we do
- Test the assembly with a calibrated gauge, and show you the readings.
- Repair on the spot where we can — we carry rebuild kits for the common RPZ and double check assemblies, so a failure usually does not mean a second visit.
- File the result with the water company, rather than handing you a form to post on.
- Track your due date and come back before it, not after the reminder letter.
Communities on this system
Powell, Lewis Center, Sunbury, Galena, Ostrander, Ashley, Cardington, Mount Gilead. Not sure whether your building is on Del-Co? It is on your water bill, or call (614) 526-4995 and we will tell you from the address.