Water and sewer bills in Grover Beach could increase by nearly 20% to make up for a $2 million deficit in revenue, the city announced Wednesday in a news release. At its Sept. 5 meeting, the Grover Beach City Council learned about the findings from a recent utility rate study, heard recommendations and unanimously instructed the city staff to start the Proposition 218 process, a step in notifying the public about proposed rate changes, the release said.