The Board also supervises local option referenda in counties and municipalities that wish to prohibit or permit establishments to sell or serve alcohol. According to Section 472 of the Pennsylvania Liquor Code, a local option referendum to change what alcohol sales a municipality allows or prohibits may be voted on during any election. The issue may not be voted on more than once in four years. A referendum can be broad – for example, allowing all forms of alcohol sales in a municipality – or it can be very narrow, for example, allowing only a specific golf course to sell alcohol. To place a referendum on the ballot requires a petition with a number of signatures equal to at least 25 percent of the highest vote cast for any office in that municipality in the preceding general election. As of August 2017, almost 700 Pennsylvania municipalities are "dry" or "partially dry."