How to Use This Plumbing Resource
Backflow Authority serves as a structured reference for professionals, property owners, facility managers, and researchers operating within the backflow prevention and cross-connection control sector. This page describes how the site is organized, where to start based on specific needs, and the boundaries of what the directory covers. The backflow prevention field intersects plumbing licensing, public health regulation, equipment standards, and municipal enforcement — navigating it efficiently depends on understanding how those categories are separated here.
How to navigate
The site is organized around two primary tasks: locating qualified professionals and understanding the regulatory and technical landscape that governs their work. Readers with an immediate service need — identifying a licensed tester, certified installer, or cross-connection control specialist — should move directly to the Backflow Listings section, which aggregates professional and business entries by service type and geography.
Readers who need context before engaging a professional — including facility managers unfamiliar with local compliance obligations, or property owners responding to a water utility notice — will find structured reference material linked throughout the site. The Backflow Directory Purpose and Scope page describes what types of entries are included and the qualification criteria used to classify them.
Navigation within any listing category follows a consistent pattern:
- Service geography — entries are indexed by state and municipality, reflecting the jurisdictional nature of backflow compliance
- License or certification type — entries identify whether a professional holds a backflow tester certification, a plumbing contractor license, or both
- Device scope — some professionals specialize in specific assembly types (reduced pressure zone assemblies, double check valves, atmospheric vacuum breakers); listings note these distinctions where disclosed
- Regulatory alignment — entries reflect the oversight frameworks of named agencies such as the American Water Works Association (AWWA), the American Society of Sanitary Engineering (ASSE), and state plumbing boards
What to look for first
The single most important variable in any backflow-related compliance or service inquiry is jurisdiction. The U.S. Environmental Protection Agency sets baseline cross-connection control expectations under the Safe Drinking Water Act (42 U.S.C. § 300f et seq.), but implementation authority is delegated to state drinking water programs, which in turn authorize local water utilities to administer cross-connection control at the distribution level. That delegation structure means requirements for device type, testing frequency, and reporting format vary materially between municipalities — and sometimes between service districts within the same city.
Before reviewing any listing or professional profile, confirm:
- Which water utility or authority has enforcement jurisdiction over the property or facility in question
- Whether a specific device assembly is already installed, and if so, whether it is an ASSE-listed model appropriate to the hazard level at the service connection
- Whether a compliance notice or test deadline has been issued by the local water authority, as that deadline determines which actions are time-sensitive
Two broad hazard categories — high hazard (severe health risk, typically requiring a reduced pressure zone assembly) and low hazard (non-health risk, typically permitting a double check valve assembly) — govern which device class is acceptable. The distinction between these classifications is established by standards bodies including ASSE International and the USC Foundation for Cross-Connection Control and Hydraulic Research. A listing entry for a licensed tester cannot substitute for a licensed engineer's or inspector's hazard determination at a specific site.
How information is organized
Reference content on Backflow Authority is structured around the operational categories that practitioners and compliance officers encounter in sequence. The How to Use This Backflow Resource page (this page) functions as the entry point. From there, content branches into three parallel tracks:
Regulatory and compliance reference — covers the structure of state and local backflow programs, the role of agencies such as the Texas Commission on Environmental Quality (TCEQ), the Washington State Department of Health, and the Mississippi State Department of Health (MSDH), and how cross-connection control programs are administered at the municipal level.
Device and technical classification — covers assembly types (reduced pressure zone, double check valve, pressure vacuum breaker, atmospheric vacuum breaker, and spill-resistant vacuum breaker), the ASSE 1000-series product performance standards that govern each, and the installation and testing protocols those standards require.
Professional qualification standards — covers the certification pathways recognized by the American Backflow Prevention Association (ABPA), the American Water Works Association, and individual state plumbing licensing boards. Certification holders listed in the directory have been classified against these frameworks; the site does not independently verify current license status, which must be confirmed through the relevant state board.
Listings themselves contain structured data fields rather than narrative descriptions, enabling direct comparison between entries on criteria such as service area, certification body, and device specialization.
Limitations and scope
Backflow Authority is a reference directory. Entries represent professionals and businesses operating in the backflow prevention sector; inclusion does not constitute an endorsement, guarantee of licensure, or verification of current standing with any regulatory body. License and certification status changes in real time through state plumbing boards and certifying organizations — the ABPA, AWWA, and individual state agencies maintain authoritative license lookup tools that supersede any static directory record.
The directory does not cover:
- General plumbing services unrelated to cross-connection control or backflow prevention device installation, testing, or repair
- Product retail or equipment distribution — entries are limited to service professionals and firms
- Legal interpretation of local water authority requirements or plumbing code provisions
Regulatory content on the site references named codes and agencies — including the Uniform Plumbing Code (UPC), ASSE International standards, AWWA M14 (the association's cross-connection control manual), and state administrative codes — but does not constitute legal or engineering advice. Compliance determinations for specific properties require engagement with the local water authority and, where required by code, a licensed professional engineer or certified cross-connection control specialist.
The geographic scope of the directory is the United States. Canadian provincial frameworks, international standards (ISO or EN series), and non-potable water system backflow requirements outside of U.S. drinking water programs fall outside the scope of this resource.