RedactedNarrative: Our agency was unofficially notified of this accident on 9/30 by a father of one of the girls who was injured inquiring about if this accident had been reported and not willing to give information about it as he didn't want to get anyone in trouble.  On 10/10 we received a public request for any information we had in regards to this case from the father's attorney.  As we were notified after the fact and two of the parties involved were uncooperative this is the information that was able to be obtained.  Operator had 4 passengers on board.  He took off at a high rate of speed and almost immediately crashed the vessel into dock ejecting three passengers.  One passenger landed on the dock and one hit the dock and two others went into the water.   One passenger who landed in the water was not injured and the only person who wore a pfd on the vessel.   Officer was unable to make contact with her for a statement.  Operator was cited for failure to report an accident, unsafe operation of motorboat, overloading, no navigation lights or pfd's and operating unregistered motorboat.