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Installation scope

RPZ installation: plan drainage, access, testing, and approval

RPZ installation requires an approved protection requirement plus a site plan for location, drainage, access, isolation, piping, testing, and filing.

Working verdict

RPZ installation requires an approved protection requirement plus a site plan for location, drainage, access, isolation, piping, testing, and filing. The assembly cannot be selected as a retail product swap.

Backflow decision workflow reference
FIELD VIEW Use the shape as a clue. Confirm the model label before service.
Before you act

Escalate missing authority approval, no safe drainage path, uncertain shutdown control, or inaccessible service location.

Interactive check

Turn observations into a next step

This narrows the route. It does not replace an on-site test, manufacturer instructions, or local requirements.

What site conditions must be resolved before an RPZ installation is specified?

Evidence sequence

Move in this order

  1. 01

    Verify the exact asset

    Confirm authority requirement and exact system use.

  2. 02

    Apply the right requirement

    Document location, drainage, access, piping, and isolation conditions.

  3. 03

    Retain the completed record

    Complete initial test, filing, and final asset record at return to service.

Identification notes

What to look for

  • The governing requirement must identify the required protection method.
  • Relief discharge and drainage must be considered in the installation plan.
  • Access for testing and service must remain available after installation.

Safe observations

What you can check without taking it apart

  • Use the official utility or authority requirement for this property.
  • Confirm exact model and size before parts, repair, or replacement work.
  • Retain the final result with the property asset record.

Stop conditions

Move to qualified help when

  • No approved protection requirement is documented.
  • Relief discharge or service access is not safely addressed.
Get help with this next step

Boundary check

Do not confuse this path with

  • A generic product listing is not an approval record.
  • A different system type may require a different workflow.
  • This page does not replace a qualified on-site assessment.

Official local layer

Your utility sets the rule

The governing program determines compliance requirements, while exact manufacturer documentation determines the identified assembly service path.

Verified utility matches: 96

Evidence ledger

What this decision path is built on

The governing program determines compliance requirements, while exact manufacturer documentation determines the identified assembly service path.

  1. 01
    U.S. EPA · EPA-CCC-001Cross-Connection Control ManualBackflow, backsiphonage, device families, hazard protection, testing, and program responsibility. Verified 2026-08-02.
  2. 02
    Watts · WATTS-RPZ-009Series 009 reduced pressure zone assemblyRPZ construction, relief discharge, installation constraints, service literature, and local-code warning. Verified 2026-08-02.
  3. 03
    USC Foundation for Cross-Connection Control and Hydraulic Research · USC-APPROVAL-LIST-2026List of Approved Backflow Prevention AssembliesCurrent approval-list guidance: exact assembly type, manufacturer, model, size, manual edition, orientation, and approved replacement shutoff compatibility must be verified. Verified 2026-08-02.

Continue the case

Related next steps

NoticeReview a backflow test noticeFailureHandle a failed backflow testReportSubmit a backflow report

CONTENT REVIEWED · 2026-08-02