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Approved backflow tester directories by city:

• ABCWUA certified backflow testers — list dated August 27, 2026
• Anaheim-approved backflow testers — as of July 2026
• Arlington-approved backflow testers — list as of captured 2026-10-16 (live Envirotrax)
• Austin-approved backflow testers — list as of WEIRS report generated Oct 16, 2026 10:13 a.m. CT
• Charlotte-approved backflow testers — list as of 10/5/2026 12:02 p.m.
• Columbus-approved backflow testers — All Devices list created 10/1/2026
• Corpus Christi-approved backflow testers — list as of captured 2026-10-16 (live Envirotrax)
• DC Water registered backflow service providers — roster dated September 29, 2026
• EBMUD-approved backflow testers — as of 10/5/2026
• Fort Worth-approved backflow testers — list as of captured 2026-10-16 (live Envirotrax)
• Houston-approved backflow testers — CCCP list as of 10/1/2026
• Irving-approved backflow testers — list as of captured 2026-10-16 (live Envirotrax)
• Los Angeles County certified backflow testers — as of 9/3/2026
• Philadelphia Water-certified backflow testers — lists as of October 12, 2026
• Phoenix-approved backflow testers — list as of 8/11/2026
• Plano-approved backflow testers — list as of October 12, 2026
• Raleigh-certified backflow testers — list as of August 18, 2026
• Riverside-approved backflow testers — as of 1/6/2026
• Sacramento County certified backflow testers — as of 9/1/2026
• San Diego-approved backflow testers — as of 08/26/2026
• San Francisco-authorized backflow testers — as of August 14, 2026
• City of Spokane backflow assembly testers — 2026 list
• Tacoma Water backflow assembly testers — page captured October 16, 2026
• Tampa-registered backflow testers — list as of June 18, 2026