Buoyed by the prospect of millions of dollars over time from the community preservation fund, East Hampton Town officials are moving quickly on plans to reduce water pollution. In a program that could begin later this year, properties that meet certain criteria could have a portion, or even all, of a replacement sanitary waste system paid for with public money. This is good, but there is still reason to be wary about potential misuse because of a lack of clarity in the underlying state law.