San Franciscans hoping to install such a system don't have to pay any state or city permitting fees — for now. In August, the state loosened their regulations to facilitate greywater use by allowing the systems without permitting. The state ruling specified that local agencies may pass tighter constraints on greywater rules if they so choose. Looks like San Francisco might so choose.
San Francisco Plumbing Inspector Steven Panelli proposed that greywater systems should be inspected by city employees — and called for the aforementioned permitting fees. The Building Inspection Commission punted on the matter today, leaving the door open for such fees to be implemented in the future.