Lake Oswego: backflow testing rules
Serves Lake Oswego, OR. Every point below comes from Lake Oswego's own pages, linked; check your notice for your own deadline.
Who must test
- Homes and businesses with connections such as irrigation, hot tubs, pools, or private wells must have a backflow prevention device that is tested once a year by a certified tester. Source.
- Test cock plugs on below-ground devices are a City requirement; failed devices must be repaired and retested, and AVBs or PVBs on irrigation needing more than normal repairs must be replaced with approved double check devices. Source.
Notices and deadlines
- Backflow tests must be performed, and reports submitted, no later than July 15 each year. Source.
How the report is filed
- Testers or owners mail or email all backflow test reports to Backflow@lakeoswego.city or City of Lake Oswego, Attn: Backflow, 17601 Pilkington Rd, Lake Oswego, OR 97035. No portal is named. Source.
Tester registration
- Backflow assembly testers must hold a CCB or LCB license if they charge for their services, in addition to State of Oregon tester certification. Source.
- City ordinance and OHA rules require all backflow assemblies to be tested by a State of Oregon certified tester on installation and annually after that. The page links the OHA tester list. Source.
Read October 6, 2026. Program page: ci.oswego.or.us.