Hilo backflow testing

11 companies on Hawaii County Department of Water Supply's tester list · 16 testers in total · list version April 24, 2026

About this list

Utility: Hawaii County Department of Water Supply
List title: “Certified General Tester List” (as printed)
Version: April 24, 2026
List date: 2026-04-24
Fetched: 2026-11-04 (UTC)
Format: PDF
Testers: 16 testers on the list. 1 tester on this list has no company named. We count them but do not list individuals.
Gaps: Our copy of Hawaii County Department of Water Supply's list (version April 24, 2026), fetched 2026-11-04, no phone for 9 of the 11 companies (the list prints none for them, or prints a number only one tester of the company gives, or one labelled as a mobile, which we do not republish). Those cards leave the field out.

On Hawaii County Department of Water Supply's approved list, version April 24, 2026 · fetched 2026-11-04

Every company below is on this list; each card says “On this utility's approved list”. The list is the utility’s, not ours: we copy company names, addresses and phone numbers from it, sort them A to Z and do not rank or endorse anyone. Confirm with your utility before booking.

On the list as ofApril 24, 2026

Certified General Tester List. Fetched 2026-11-04 (UTC).

Open the utility’s own list
The utility’s backflow program page
How we handle listings (correct or remove a listing)

Confirm with your utility before booking.