The Haines Borough is proposing a 4 percent rate increase for most water and sewer customers, partly to help cover the cost of the borough’s purchase of Crystal Cathedrals Water and Sewer System.

The Crystal Cathedrals acquisition, though, ultimately might have a much heftier cost than its initial $370,000 pricetag.

According to a July letter from engineer James Dorn of Carson Dorn Inc. of Juneau, connecting the formerly private utility to the borough’s water and…