The Hawaii Laborers’ Union Local 368 and Operating Engineers Local Union 3 will announce their pick for mayor tomorrow. And they’re doing it at a sewage treatment plant.

The unions, which claim a combined total local membership of around 8,000, put out a joint media advisory this morning that said representatives would not only unveil their endorsement but also “will address issues with the Sand Island Waste Water Plant treatment facility and how the lack of an additional digester is impacting the craft industries, job-creation and Hawaii’s economy.”

Their preferred candidate will also speak on the issue, “announcing his plans as part of a larger Vision of Honolulu that will be released soon.”

The endorsement comes less than a week after Mayor Peter Carlisle‘s administration again went toe-to-toe with the Honolulu City Council over the second digester. You can read more about that pending budget battle here: Mayor Won’t Cancel Sewage Treatment Contract

UPDATE: The Laborers’ Union was originally scheduled to announce its endorsement last week, but postponed.

(Photo courtesy Ron Slauson)