The northwestern and southwestern pond turtles are two species of freshwater turtles facing significant population declines across their ranges. The primary threats to their survival are habitat loss and invasive species, while disease also poses a potential risk to their remaining populations. Recently, the parasitic North American Turtle Leech (Placobdella parasitica) was confirmed in Oregon on the northwestern pond turtle (Actinemys marmorata), a species native to regions east of the Rocky Mountains. In 2024, we documented the presence of P. parasitica at the Cache Creek Preserve in Yolo County, CA, affecting both A. marmorata and red-eared sliders (Trachemys scripta). Additionally, we found P. parasitica on a common snapping turtle (Chelydra serpentina) at a golf course adjacent to the San Diego River. These findings suggest that P. parasitica may be widespread throughout California. We recommend that leech surveillance be included in turtle sampling efforts and emphasize the importance of collaborating with leech experts to monitor this potential threat.