About Backflow Tester List
Backflow Tester List is a free Directory Assistance Group reference. It explains, state by state, who may test backflow prevention assemblies and links the official page.
Why this site exists
A sprinkler, a boiler, or a fire line can need a backflow assembly, and the water utility usually wants a passing test on a schedule. The person who may sign that test is a state or utility rule, not a national license.
The pages here name the drinking-water agency and the credential that agency describes. They do not sell tests and they do not list private testers unless an official roster page is the source.
How to use it
Choose the state, read who may test, and open the official link. Then check the water system named on your bill. If those two answers differ, the utility's written rule is the one that decides whether your report is accepted.
Who writes it
Backflow Tester List is published by Directory Assistance Group, an independent publisher of free lookup tools and directories, and is written and maintained by a small editorial team. We are not lawyers, engineers, doctors, or government officials, and we do not claim to be. What we do is read the primary sources (statutes, agency guidance, university extension publications, and official court and health-department pages), turn them into plain steps, and link every claim back to where it came from.
How the site is paid for
The site is free to use and is supported by advertising, clearly labeled featured listings, and a few Amazon affiliate links. Advertisers do not choose or review our topics, and payment never changes what a guide says or the official details we list. Read our editorial standards for how we pick sources, correct mistakes, and keep ads separate from content.
Tell us what we got wrong
Rules change and local details vary. If you spot an error or an out-of-date figure, please send us a note with a link to the source. We read every correction and date-stamp the fix.