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Backflow testing guides
Plain-language explainers for common San Diego questions about backflow testing. They are not a site visit and not a bid. When you need someone to look, use a request page.
What is backflow testing
Backflow testing is a certified check of a backflow preventer — the assembly that keeps irrigation, fire-line, or building water from reversing into the public supply. Most local water agencies require it on a regular interval, often yearly, and they mail you when it is due. This site forwards a request. It is not the tester of record and does not file the report.
RPZ valve
An RPZ valve is a reduced pressure zone assembly — the high-protection backflow preventer on many commercial, irrigation, and fire lines. It has two shutoffs and a relief valve in the middle that can spit when something is wrong. It also fails tests more often than a simple double-check. This page names the device. It does not test it.
Backflow preventer leaking
A leaking backflow preventer is usually a relief port discharging or a check that will not hold. On an RPZ, a relief that dumps is the device telling you it is not passing. The water agency still wants a passing report. That means repair or replacement, then a retest. This page cannot make a leak disappear.
What is a backflow preventer
A backflow preventer is a plumbing assembly that stops water from reversing into the potable supply. Irrigation, fire lines, and many commercial buildings in San Diego County have one because fertilizer, standing water, or building pressure should not enter the public main. The device is why you get a test notice. This page defines it. It does not replace the utility.
Related pages
These are more request pages on this site, not a list of partner shops. A licensed local provider may contact you if they accept a lead.
Request backflow testing in San Diego
Call if you want to talk now, or send the form. Either way this is a request, not a booked job.
Call (619) 604-7252