SEATTLE (AP) — The cost of a new sewage treatment plant for King County has risen to as much as $1.86 billion.
The project manager delivered the latest estimate last week to the Regional Policy Committee.
The Seattle Times reports it doesn't include $152 million in dispute over problems with tunnel boring machines.
To help finance the project King County County Executive Dow Constantine asked the county council last month to raise the monthly household sewer bill to more than $35. Nine years ago, rates were less than $20 a month.
The plant called Brightwater is being built near Woodinville and requires a 13 mile tunnel to pump the outflow to Puget Sound near Edmonds.