The NSW Environment Protection Authority (EPA) is doorknocking and talking to residents in the Mullumbimby area after PFAS was found in groundwater.

The EPA and Fire and Rescue NSW (FRNSW) undertook a door knock of 12 properties south west of the fire station yesterday.

Additionally, EPA staff will be out and about in the area this week door knocking around 68 properties as part of a precautionary approach to understanding more about groundwater use in the area.