The Douglas councillor says a change in culture has prompted his resignation.
His resignation as chair also means he will no longer sit on the executive committee.
Mr Pitts has served the board for more than 10 years, so what has changed?
Councillor Andrew Bentley succeeds Mr Pitts as chair.
Beach water quality tests start next month
Tests on water quality on the Island's beaches will get underway in around two weeks' time.
Time running out to enter Parish Walk!
There's just over a week left to get your entry in for one of the Island's biggest annual sporting events.
Minister to make statement on immigration rules
Cabinet Office Minister David Ashford will make a statement about immigration policy during next month's Tynwald sitting.
Sloc closed for Classic Hill Climb event
A road in the south of the Island will be closed for much of today as a motorsport event gets underway.
Local authority elections today
Polls will open this morning as voting gets underway in local authority elections.
Cregneash bus campaigners hold meeting
Campaigners demanding the return of a bus service to one of the Island's best-loved beauty spots will hold a coffee morning later this month.
Silt at new Liverpool ferry terminal means sailings rescheduled
The Steam Packet Company says silting underneath the new ferry terminal in Liverpool means it's rescheduling a number of sailings next week.
Minister defends Manx Care mandate consultation
Health Minister Claire Christian says a new mandate for Manx Care has undergone significant consultation as it was put together.
