Backflow Tester List

State rules

Hawaii

Hawaii’s Department of Health, Safe Drinking Water Branch, administers Hawaii Administrative Rules Title 11, Chapter 21, Cross-Connection and Backflow Control. The rules-index page lists that chapter with an effective date of December 26, 1981, and lists the Safe Drinking Water Branch as the program contact. The chapter’s purpose is to protect public water systems by isolating contaminants that could backflow or backsiphon from a customer’s system, to eliminate or control cross-connections, and to keep a continuing cross-connection control program. A 2023 significant-deficiency fact sheet tells systems that backflow preventers not tested annually by a certified tester are a deficiency.

Checked against official sources on October 11, 2026. Rules and links change; confirm with the office listed before you act.

Try a ZIP like 30303, “Travis County” or “Columbus, OH”
Drinking-water agency
The Hawaii Department of Health, Safe Drinking Water Branch, administers HAR Title 11, Chapter 21.
Who may test an assembly
The 2023 fact sheet says backflow preventers must be tested annually by a certified tester. The pages reviewed do not name a single certifying organization.
Official program page
Official page →

Chapter 11-21 says its purpose is to protect public water systems from contamination or pollution by isolating, within the customer’s internal distribution system or private water system, contaminants or pollutants that could backflow or backsiphon into the public system. It also aims to eliminate or control existing cross-connections, actual or potential, and to provide a continuing program that systematically prevents contamination of potable water systems. The rules-index page identifies the Safe Drinking Water Branch and a telephone number, 808-586-4258, for that chapter. The chapter is the state’s cross-connection rule, separate from operator certification under Chapter 11-25.

The 2023 significant-deficiency fact sheet lists unprotected cross-connections, including connections to irrigation or other non-potable systems and wastewater treatment plants, as distribution deficiencies. It gives examples: a hose bibb without a vacuum breaker, a connection to irrigation or another non-potable system, and water service to a wastewater treatment plant. The suggested correction is a vacuum breaker on the hose bibb or a reduced-pressure principle backflow preventer at the other cross-connections. The same sheet lists “backflow preventers not tested annually by a certified tester” as its own deficiency line.

The fact sheet also says the lack of a formal cross-connection control plan in accordance with Safe Drinking Water Branch guidance is a deficiency, and it flags missing plugs or caps on backflow prevention device test ports. It does not, in the passages reviewed, name ASSE, ABPA, or AWWA as the organization that certifies the tester. A customer should ask the public water system what “certified tester” means in the system’s program and should not treat the 1981 chapter title as a roster. Emergency interconnections between regulated systems are discussed separately and are not automatically required to have a backflow device.

Official resources in Hawaii

Safe Drinking Water Branch

Department of Health page that lists Chapter 11-21, Backflow and Cross-Connection Control.

Title 11 rules index

Lists Chapter 21, its effective date, and the Safe Drinking Water Branch contact.

Significant deficiency fact sheet

Says unprotected cross-connections and backflow preventers not tested annually by a certified tester are deficiencies.

Key facts for Hawaii

What to do next

  1. Ask the water system what certification it accepts for the annual test the fact sheet describes.
  2. Fix obvious hose-bibb gaps before a sanitary survey; the fact sheet names them.
  3. Ask whether the assembly is on an emergency interconnection, which the fact sheet discusses separately.
  4. Use the Safe Drinking Water Branch, not a private class flyer, as the state contact for Chapter 21.

Looking for your city or county in Hawaii?

We haven't found official program-level pages for Hawaii we can verify yet, so we don't show local numbers here rather than guess. Here's what to use instead, in order:

  1. General Start with the statewide information above. It applies across Hawaii, but cities and counties can add their own steps, fees or deadlines.
  2. Call to confirm Ask the official office. They have the current local rule, fee and form.
    Hawaii Safe Drinking Water Branch
    Website →
    Phone: (808) 586-4258 (as listed on that page, checked Oct 4, 2026)
    Your city or county office: Local governments →
    Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Hawaii page on USA.gov can point you to the right office.
  3. Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.

Helpful guides

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