As of January 1, 2024, the Oakland County Water Resources Commissioner’s office will only accept backflow prevention assembly tests performed and signed by testers who possess a valid American Society of Sanitary Engineering (ASSE) Standard 5110 certification as well as a valid master plumber, journey plumber or apprentice plumber license. Please note that you are responsible to hire and pay for any services performed. We neither endorse nor recommend individual testers or testing companies. We suggest you contact several firms for price quotes, comparisons and to verify valid ASSE certifications and licenses prior to making your selection. If you require further assistance, please contact us at 248-858-1431 or via email at wrccrossconnection@oakgov.com.

DISCLAIMER: This list of backflow prevention assembly testers is provided as a courtesy and is not intended as an endorsement or referral. This is not a complete or comprehensive list. The firms listed above have no affiliation with the Oakland County Water Resources Commissioner’s Office nor does our office assume any liability for the services performed.

This page was updated on 5/29/2024.