Backflow installation, winter care, and reports

Installation review and access

Use OAR 333-061-0071, the applicable OPSC, the water supplier's requirements, and the approved model's installation instructions. Oregon requires access for operation, maintenance, inspection, and in-line testing. Its diagrams and approved installation standards establish clearances; do not invent a universal twelve-inch side/six-inch rear/forty-eight-inch maximum schedule for every assembly.

RP relief valves must be protected from any submersion, with approved air-gap drainage. DC assemblies can be below grade in an adequately drained vault, with watertight caps or plugs on test cocks and no continuous immersion. A vault drain must not connect directly to a sanitary or storm drain. The five-foot height/platform rule applies to RP and DC installations; approved reduced clearances for assemblies with pipes two inches or smaller require authority approval and accessible servicing.

PVB and SVB assemblies must stand twelve inches above the highest downstream piping and outlets. AVBs require six inches. Check the highest actual point, including raised beds and uphill piping, rather than only the head beside the assembly. New grading can change compliance. Verify approved orientation on OHA's assembly list because a similar-looking model can have different approval conditions. Current Oregon drinking-water rules.

Freeze protection and seasonal drainage

Freeze protection depends on climate, exposure, operation, and product instructions. Insulation delays freezing but does not create heat. A heated enclosure must provide the required access, ventilation, drainage, and safe electrical installation. Do not declare one enclosure class mandatory for every eastern Oregon property.

For seasonal shutdown, isolate and drain according to the assembly manufacturer. Some ball valves and test cocks use a partially open storage position to release trapped water; that is product-specific procedure, not a universal forty-five-degree mandate for all equipment. A removable assembly can be drained and stored when the installation permits that approach. Never blow irrigation compressor air through the assembly; isolate it and use the downstream irrigation connection. Restore it correctly and obtain required testing before return to service.

Licensing Boundaries: Landscape Contractor (LCP) vs. Licensed Plumber

Understanding the statutory boundary between Oregon Landscape Contractors Board (LCB) licensing and Oregon Building Codes Division (BCD) plumbing licensing is critical for legal compliance:

• Potable Water Service Tap & Meter: Tapping into a municipal potable water main, setting a water meter, and running the primary domestic service lateral to a commercial or residential structure falls strictly under the jurisdiction of a licensed plumbing contractor under ORS Chapter 693 and the OPSC.
• Landscape Irrigation Scope: Under ORS 671.520 and OAR Chapter 808, an Oregon licensed Landscape Contracting Business with an individual Landscape Construction Professional (LCP) holding the All Phase or Irrigation Only phase is legally authorized to install, alter, and repair landscape irrigation systems. This statutory authority includes physically mounting, piping, and connecting approved backflow prevention assemblies to the irrigation mainline downstream of the potable service tap.
• Interior Building Connections: If an irrigation water source originates inside a residential basement, crawlspace, or commercial mechanical room, the initial pipe penetration, isolation shutoff, and potable tie-in must be performed by a licensed plumbing contractor under a local plumbing permit. Once the piping exits the building foundation to grade, the landscape contractor may proceed with exterior irrigation installation.

Testing qualifications, triggers, and reporting

Oregon's water suppliers enforce cross-connection programs and required testing. Assemblies are tested at installation, after repair or relocation, and at least annually, with additional tests where required. The tester must meet OAR 333-061-0072: this includes Authority-certified testers and the specified qualifying journeyman or apprentice plumber pathways. A plumbing or LCP license by itself is not a blanket tester authorization.

Use approved procedures and calibrated equipment. Record the assembly's make, model, size, serial number, location, test results, repair, and final passing result. Test reports go to the water user, water supplier, and tester's permanent records and must be provided within ten working days in the supplier's accepted form. An unexplained annual “certification sticker” is not a substitute for the test report.

When an assembly fails, follow the water supplier's corrective instructions and deadline, repair appropriately, and retest. Suppliers can discontinue service under their cross-connection enforcement requirements, but do not invent a universal ten-to-thirty-day grace period. Keep the system isolated when required until protection is restored.