Backflow testing
Annual certified test on RPBA, DCVA, and PVB assemblies. We run the test, fix what doesn't pass, and file with your water utility.
- Residential & commercial assemblies
- Repair kits & replacements
- Reports filed for you
Service / 07 · Backflow & Fixtures
Small jobs,
Small jobs,
big-job care.
Big Four Plumbing — annual backflow testing and fixture replacement in Granite Falls and Snohomish County, WA.
Annual backflow testing, faucet and toilet swaps, pressure regulators, expansion tanks, and disposal replacements. The not-glamorous work that every house eventually needs — done right, on time, no upsell.
- BackflowCertified BAT
- FilingWe submit to your water purveyor
- Same-dayMost fixture jobs
BATCertified backflow assembly tester
FiledReports submitted for you
Moen / KohlerTrusted fixture brands
SmallNo "minimum trip" surprises
What we do / 01
Annual maintenance
and "while you're here" jobs.
The smaller stuff most plumbers don't want to be bothered with.
Faucet replacement
Kitchen, bath, laundry, exterior. Bring us the faucet you picked or we'll bring options. No hidden labor markup.
- Single-handle, widespread, bridge
- Pull-down kitchen faucets
- Outdoor frost-free hose bibs
Toilet replacement
New toilet supplied or yours. Wax ring, supply line, and angle stop refreshed at the same time. No more rocking, running, or leaks.
- Standard, comfort-height, bidet-ready
- Wax ring & flange repair
- Old toilet hauled away
Garbage disposals
Disposal swap, jam fixing, leak repair. We carry standard-quality units and can install yours if you've already bought one.
- InSinkErator, Moen
- Same-day install
- Drain re-plumb if needed
Pressure regulators (PRV)
Banging pipes, leaking fixtures, and quick-failing water heaters often trace back to a bad PRV. We test and replace.
- PRV testing & adjustment
- Watts & Cash Acme replacement
- Static & dynamic pressure check
Expansion tanks & valves
Required by code on closed systems. We size, install, and replace expansion tanks, T&P valves, and angle stops.
- Sized to your water heater
- Angle stop replacement
- Hammer arrestors
Backflow basics / 02
What backflow is,
and why your city cares.
The short version, for homeowners getting their first annual notice.
It protects the drinking water
A backflow assembly stops contaminated water (irrigation, fire-suppression, boilers) from siphoning back into your potable system.
It's required annually
Most water purveyors in Snohomish County require yearly testing on every assembly, with a report filed by a certified tester.
Failed test ≠ replacement
Most failed assemblies just need a rebuild kit — a small repair, not a whole new device. We carry the common kits.
We file the paperwork
You shouldn't have to chase your water utility. We submit the test report electronically, and you get a copy for your records.
FAQ / 03
Backflow & fixture questions.
Don't see yours? Call (360) 488-8553.
How long does a backflow test take?
About 20–30 minutes per assembly if everything passes. We file the report with your water utility the same day.
Why did my water bill jump?
Often a running toilet, leaking angle stop, or failing PRV that's letting pressure spike. We can usually find it in one short visit.
Can you install the faucet I bought online?
Yes — as long as it's a quality unit. Some big-box-only fixtures use proprietary parts that fail fast; we'll flag those before installing.
Do you have a minimum charge?
There's a small trip charge for service calls in your area, which we apply against the work. We'll quote it on the phone before we roll.
How do I know if my pressure is too high?
Static water pressure should be 50–80 psi. Above 80 you're stressing every fixture and the water heater. We test for free when we're already on a service call.
Free quote / 04
Schedule a small job.
Send the form or call (360) 488-8553. Most fixture and backflow jobs are booked same-week.
- Phone(360) 488-8553
- Address23100 135th St NE, Granite Falls, WA 98252
- HoursMon–Sat 7am–7pm · 24/7 emergency