PARACHUTE JUMP PLANE PILOT REPORTS PROBLEMS WITH CTAF AND PARACHUTE ACTIVITIES FREQUENCIES AT L65.

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THERE IS AN ONGOING FREQ SEPARATION AND INCORRECT FREQ USE ISSUE AT PERRIS; CA (L65). THE FIRST INCIDENT WAS ON A FLT FROM ZZZ TO L65. TALKING TO MARCH APCH; I LISTENED TO THE DROP ZONE FREQ 122.775 AS SUGGESTED IN THE AFD. I HEARD THE 'JUMPERS AWAY' WHEN WE WERE MAYBE 5 MI FROM THE ARPT. I SWITCHED TO THE CTAF FREQ TO MAKE THE APPROPRIATE CALLS. WHEN WE MADE THE 'L DOWNWIND TO BASE; RWY 33' CALL; SOMEONE ON THE FREQ TOLD US THAT WE WERE ON THE 'WRONG FREQ' THAT THE PERRIS TFC USES 122.775. I SWITCHED TO 122.775 JUST IN TIME TO HEAR THE JUMP PLANE CALL THAT THEY WERE 'ON A HIGH BASE FOR RWY 33.' I ELECTED TO GET OUT OF THE PATTERN. WE LANDED SAFELY AFTER COMPLETING THE PATTERN AGAIN. 5 DAYS LATER; I WAS TRANSITIONING THE AIRSPACE NEAR LAKE ELSINORE'S JUMP ZONE AND MONITORING 122.9; THE FREQ THAT I BELIEVE THE JUMP PLANE THERE USES. I OVERHEARD A PLT ANNOUNCING ARR TO PERRIS AND THE ELSINORE JUMP PLANE PLT TELLING THE PERRIS TFC THAT THE FREQ IS 'WRONG ON THE CHART' AND DIRECTED THEM TO 122.775. AS YOU CAN SEE; THIS IS AN ACCIDENT WAITING TO HAPPEN. I'VE HEARD SIMILAR STORIES FROM OTHER PLTS WHO HAVE FLOWN TO PERRIS. THE PERRIS USERS SHOULD BE USING THE CTAF FREQ FOR THEIR TFC CALLS.