What is a backflow prevention device and how does it relate to irrigators?
Backflow prevention devices are crucial to the Umatilla Basin because they help protect water quality by preventing contaminated water from polluting the aquifer. These devices ensure that water from irrigation systems in which chemicals or fertilizers have been added does not pollute water supplies by preventing contaminated water from flowing backwards into the water supply.
The landowner is ultimately responsible for the maintenance and use of the water supply well (
OAR 690-215-0005). If you are a landowner within the Umatilla Basin area using a well for irrigation in combination with the use of fertilizers or chemicals, then you are required to have a functional backflow device installed and functioning properly. See
OAR 690-215-0017(3) for more information.
The Oregon Water Resources Department and partners are hosting community events to answer questions and provide resources on Oregon’s Backflow Prevention Program. These events are FREE and open to the community!
January 14, 2026
Irrigon Library Conference Room
490 NE Main Ave, Irrigon, OR 97844
Informational tables from 11:30–1:30 p.m.
Presentation will start at 12:15 p.m.
January 14, 2026
Hermiston Armory
900 SE Columbia Dr, Hermiston, OR 97838
Informational tables from 5:30–7:30 p.m.
Presentation will start at 6:15 p.m.
January 15, 2026
Milton-Freewater Community Center
109 NE 5th Ave, Milton-Freewater, OR 97862