The Honolulu Board of Water Supply began the switchover from billing customers twice a month, to once a month.

Hundreds of thousands of customers began receiving the bills this week.

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To contact the Honolulu Board of Water Supply, email them at contactus@hbws.org, call at 748-5000, or call the ENV at 768-3330 during normal business hours, 7:45 a.m. to 4:30 p.m., Mondays through Fridays.