Check your state laws for proximity to shoreline laws and also dangerous or negligent operation laws. Talk to your law enforcement folks and explain the circumstances including video or pictures. Invite them to come in by vehicle and treat them to a lunch to observe especially if there boating is predictable enough to know when they will be on the water. You know who they are and what they are doing so if you know what rules are being violated it is a slam dunk. My concern would be the possible retribution when you aren't around. The negligent driving rule is a catch all that is a judgement from the officer. I wish you the best.


Washington law states that these dangerous operating practices are illegal.

Negligent Operation is operating a vessel in disregard of careful and prudent operation, or in disregard of careful and prudent rates of speed in a manner that unduly or unreasonably endangers the life, limb, property, or other rights of any person. This includes:
•Not paying attention to the operation of the vessel
•Failing to keep a proper lookout
•Failing to follow the navigation rules
•Causing danger from the effects of the vessel's wake
•Allowing passengers to ride on the bow, gunwales, or transom of a vessel not equipped with adequate railings to prevent falls overboard

Reckless Operation is operating carelessly in a willful and wanton disregard of the rights, safety, or property of another person. It includes:
•Weaving in and out of other vessels, docks, or buoys
•Playing "chicken" with another vessel
•Operating in a marked "No Boats" area such as a swimming or dam spillway area

https://www.boat-ed.com/washington/h...ous-Operation/