Board of Water Supply Wahiawa Yard

The Board of Water Supply (BWS) Region 5 - Mililani System, under the City and County of Honolulu, provides water for about 50,573 residents living in the area of Mililani, Hawaii. Established in 1929, the Board of Water Supply is currently obtaining its supply from a ground water source, wells that pump water from the Mililani aquifer beneath Oahu.
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Mililani Drinking Water Quality

Consumer Confidence Water Quality Reports

Under the authority of the Safe Drinking Water Act, the EPA requires Board of Water Supply Wahiawa Yard to assess local water quality each year and distribute a Consumer Confidence Water Quality Report. At WaterZen, we review these reports and make the information available, in a concise, straightforward, and easy-to-understand way.

Contact Board of Water Supply Wahiawa Yard Customer Service

Have a Question, Issue or Comment?

Main Customer Service

Physical Address:
Honolulu Board Of Water Supply
630 S. Beretania St., Rm. 308
Honolulu, 96843

808-748-5030 (Mon–Fri, 7:45 AM–4:30 PM)

Emergency (24 hours - broken water main or pipeline, etc.)

Pay Your Board Of Water Supply - Mililani Bill

Already have an account?

If you already have an account, you just need to login to the Board Of Water Supply - Mililani site. Board Of Water Supply - Mililani accepts credit cards, debit, and direct deposit. Click here to login.

Want to create a new account?

You can create a new account on the Board Of Water Supply - Mililani website. Once you create the account, you can setup payment with credit, debit, or direct deposit. Click here to create an account.

Want to pay without an account?

You can make a one-time payment without creating an account. You will need to have your credit or debit card in order to make the one time payment. Click here to make a one time payment.

How to Start Honolulu Water Service

Starting Your Service

When you move to a new home in Mililani, you'll most likely already have running water, but you'll still need to set up water service with the Board Of Water Supply - Mililani. Luckily, Honolulu has made it pretty simple with the following online form. Starting service generally takes just two business days.

Click here to fill out a Start Service Form.

Stopping Your Service

When you move out of a home in Mililani, you'll need to stop your water service with the Board Of Water Supply - Mililani, so you don't keep getting billed. Simply fill out the following online form. Stopping service normally takes just two business days.

Click here to fill out a Stop Service Form.

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