Lynnwood backflow prevention
We install, repair and replace the assembly that keeps sprinkler water out of your drinking water, then run your system to prove it works.
Leaking, freeze-cracked or failed assemblies fixed by our own crew out of Lynnwood, with a clear price before any work starts.
Leave your name and number. Danny calls you back to set a time.
Prefer to talk? Call (425) 648-9443
5.0 ★★★★★Google · 7 reviews
4.5 ★★★★½Yelp · 15 reviewsA backflow preventer is a valve that stops water from your sprinkler system flowing back into your home's drinking water if the water pressure drops. Any Lynnwood home with a sprinkler system connected to the water supply needs a working one. Grizzly installs, repairs and replaces backflow assemblies across Snohomish and King County, and checks every assembly before we leave.
Every backflow visit
Whether we install a new assembly or repair an old one, every job ends with the same four checks.
We check that your assembly type matches what your water district requires.
We look for leaks, cracks and worn parts on the body and valves.
We confirm the assembly sits at the right height and location for code.
We run your sprinklers to make sure water only moves one direction.
What we do
The right assembly installed on your sprinkler system to meet local water code.
→ Double check valves → Pressure vacuum breakers → Reduced pressure assemblies
Old, cracked or failed assemblies swapped out for new ones.
→ Cracked assembly bodies → Worn-out older assemblies → Assemblies that keep failing
Leaks, worn seals and stuck checks fixed so the assembly works again.
→ Leaking or spraying assembly → Worn seals and springs → Stuck check valves
Your water district requires a yearly test. We help you get it done on time.
→ Test notice from your provider → Failed test follow-up → Retest after repair
Backflow bodies cracked by a winter freeze repaired or replaced, and covers fitted to protect the assembly through cold snaps.
→ Freeze-cracked bodies → Freeze covers → Insulation for cold snaps
Missing or wrong assemblies brought up to code after a failed inspection.
→ Missing assembly → Wrong assembly type → Wrong height or location
What goes wrong
Most backflow problems show up at the assembly itself or in your sprinklers. Here's what each sign usually means.
Usually: worn seals, a stuck check or a cracked body.
Usually: a problem at the backflow assembly that needs a closer look.
Usually: the assembly needs new seals or springs, or in some cases a full replacement.
Usually: freeze damage, most often on assemblies that weren't drained before winter.
Usually: a missing or wrong assembly, or one at the wrong height or location for code.
What it means: your yearly backflow test is due and needs to be done by a state-certified tester.
Our approach
A drip at the backflow can be a worn seal, a stuck check or a cracked body. The wrong assembly in the wrong spot can also fail inspection even when it works. Here's the difference a full check makes.
1. Look at the leak and guess the cause 2. Replace the part that looks worst 3. Skip checking the assembly type and height 4. Leave without running the system
Result: the leak may come back, and the assembly can still fail inspection.
1. Check that the assembly type matches what your water district requires 2. Look for leaks, cracks and worn parts on the body and valves 3. Confirm it sits at the right height and location for code 4. Give you a clear price, do the work, then run the system to make sure water only moves one direction
Result: an assembly that works and meets code, fixed once.
Timing
At Paine Field, the closest NOAA weather station to Lynnwood, the first frost arrives around November 17 in a typical year, and by October 31 in about one year in ten. Backflow preventers sit above ground, so they're usually the first part of your system to crack in a freeze.
April – September
Fix leaks and failed tests while the system is running, and get your yearly test done when the notice arrives.
October
Book your sprinkler blowout so the backflow and lines are drained before the first frost.
November – March
Keep the assembly drained and covered through cold snaps. It can save you a replacement in spring.
Late March – April
Turn the system back on and check the assembly. Freeze cracks show up here, and we repair or replace them.
Oct 31
First frost in 1 year out of 10
Nov 17
First frost in a typical year
Mar 9
Last spring frost in a typical year
Source: NOAA NCEI 1991–2020 climate normals, Everett Paine Field (USW00024222). First and last 32°F nights. More about sprinkler winterization →
Why Grizzly
01
We match the assembly type to your system and what your water district requires.
02
We inspect the assembly and give you a clear price before any work starts.
03
If new seals or springs will fix it, we say so. If it needs replacing, we tell you why.
04
Every assembly is checked for the right height and location for code.
05
Nothing subcontracted. The people who inspect it are the people who fix it.
06
We run your system after every install or repair to make sure everything works.
How it works
01
Call or send the form. Tell us if your assembly is leaking, failed a test or needs replacing.
02
We inspect the assembly and give you a clear price before any work starts.
03
Our own crew installs, repairs or replaces the assembly.
04
We run your system to make sure it works, and we're a call away for your fall blowout.
Reviews
★★★★★
"Danny worked on our broken irrigation pipe and a underground connector. He was efficient, on time, and got the job done cleanly. I would hire him again."
Anirban B. · Google review
★★★★★
"… Weeks after installation, I had an issue with one garden area getting oversaturated along with water build up so I called Danny and he came right over that same day and found that there was a faulty valve and he took care of it right away. Grizzly is competitively priced and Danny is very knowledgeable. …"
Ronald H. · Google review
★★★★★
"… He did a great job and was very thoughtful to not tear up the yard, and cleaned up the sidewalk as well. It turned out very nice! I appreciated the time he spent with me answering questions about my sprinkler system and other landscaping related questions I had. …"
Eric H. · Google review
Our guarantee
If a backflow assembly we installed or a repair we made fails within 18 months, we come back and fix it. We run your system before we leave, so most problems get caught on the day.
Where we work
From our base in Lynnwood, we install and repair backflow preventers across Snohomish and King County. Near the edge of the map? Call and we'll tell you straight away.
Related services
Fall blowouts that drain your backflow and lines before the first frost.
A sprinkler layout planned for your yard before anything is installed.
Questions
A backflow preventer is a valve that stops water from your sprinkler system from flowing back into your home's drinking water. It protects your family and the public water supply from fertilizer, pesticides and bacteria.
Backflow testing checks that your backflow preventer's valves and seals are working correctly. A certified tester uses special gauges to test the assembly, and the results are reported to your water provider.
Yes. Washington requires backflow assemblies on irrigation systems to be tested every year by a state-certified tester. Your water provider usually sends a notice when your test is due.
Signs include water leaking or spraying from the assembly, low water pressure in your sprinklers, or a failed annual test. Freeze damage is a common cause, especially on assemblies that weren't drained before winter.
The assembly usually needs new seals or springs, or in some cases a full replacement. After the repair, it's retested and the passing result is submitted to your water provider.
Most homes with sprinklers in Snohomish and King County have a double check valve, a pressure vacuum breaker or a reduced pressure assembly. Which one you need depends on your system and your water district. We check what your district requires before we install.
They sit above ground, so they're usually the first part of a sprinkler system to freeze. Draining yours every fall and covering it through cold snaps can save you a replacement in spring.
Yes. Grizzly Landscape & Construction LLC is registered with Washington L&I as contractor GRIZZLC755LL, and is bonded and insured. You can look the number up on L&I's Verify a Contractor tool.
In October. At Paine Field, the closest NOAA weather station to Lynnwood, the first frost comes around November 17 in a typical year and by October 31 in about one year in ten. A fall sprinkler blowout drains the backflow and lines before it freezes.
Yes. Our irrigation work, including backflow, carries an 18-month warranty: if something we installed or repaired fails in that time, we come back and fix it.
Free consultation across Edmonds, Lynnwood and Mountlake Terrace, WA.
