I know that a lot of people think the water should be clear/clearer, but low clarity may indicate a more fertile pond which has it's advantages if your goals are to promote fish health. If it's just for swimming, then the clearer the better.

Your "dirty" water may be nutrients/algae and the little organisms that feed on that nutrients. It could also be suspended clays and/or fish activity that keep it stirred up. Read here on PB about the "jar tests" and that will help you determine what is causing your lack of clarity.

Fish on!,
Noel