Fleas & Ticks

My MHP consists of 46 Lots and have 10 park owned homes.  A couple of residents starting to see fleas/ticks.  My initial reaction is to send out a letter informing all that they are responsible for flea/tick treatments and may use only an over the counter approved product to treat their yard and house if desired while following all label directions.  Any potential future liability with this?Thank you fro your thoughts!

You are responsible for treating the POHs. Residents owning their homes are responsible for treating.

Flees and Ticks are probably an issue with animals. Stray cats, dogs that run loose etc. We always send out notices that speak to the spreading of the Flees. Spray (treatment) will only help until they let another animal in with the flees. 

Thanks for input!