BackflowNear Test-Due Reminder

Approved backflow testers in Redmond, WA

37 backflow testing businesses work within 25 miles of Redmond, 2 of them based in town. Every one is on the approved tester list of 5 water utilities.

37 businesses within 25 miles

Backflow testing companies near Redmond

What the badges mean
✓ WA Utility-Approved Tester Verified On the city list
The company is on a water utility's own approved list (the second badge names the list). That is the utility's approval, not a state license, and it counts for that utility.
3 certified testers
How many certified testers the roster lists at this business.
★ 4.8 (25 reviews)
The Google rating, shown as Google reports it. It does not change the order.

Order is by our quality score, never by payment. How we verify listings.

Are you a backflow testing company near Redmond? One sponsor per county, clearly labelled. Sponsor this county

Holmberg Mechanical

90/100
✓ WA Utility-Approved Tester Verified ★ 4.2 (20 reviews) On City of Bellevue list Backflow Testing

12001 SE 9th Pl, Bellevue, WA 98005 · 7 mi from Redmond

Call (425) 822-2233 Details Website
Verified Oct 2026 · Unclaimed listing

MacDonald Miller

90/100
✓ WA Utility-Approved Tester Verified ★ 3 (4 reviews) On City of Bellevue list Backflow Testing

15395 SE 30th Pl Ste 120, Bellevue, WA 98007 · 8 mi from Redmond

Call (206) 767-7995 Details Website
Verified Oct 2026 · Unclaimed listing

Alpine Sprinklers

90/100
✓ WA Utility-Approved Tester Verified ★ 3.8 (28 reviews) On City of Bellevue listOn Washington Water listOn City of Snoqualmie list Backflow Testing

1420 NW Gilman Blvd #2, Issaquah, WA 98027 · 10 mi from Redmond

Call (425) 391-8701 Details Website
Verified Oct 2026 · Unclaimed listing

AAA Fire Protection

90/100
✓ WA Utility-Approved Tester Verified ★ 4.8 (637 reviews) On Washington Water list Backflow Testing

3013 3rd Ave N, Seattle, WA 98109 · 13 mi from Redmond

Call (800) 223-3473 Details Website
Verified Oct 2026 · Unclaimed listing

Guardian Security

90/100
✓ WA Utility-Approved Tester Verified ★ 4.3 (274 reviews) On City of Bellevue listOn City of Snoqualmie list Backflow Testing

1743 1st Ave S, Seattle, WA 98134 · 13 mi from Redmond

Call (206) 622-6545 Details Website
Verified Oct 2026 · Unclaimed listing

McKinstry

90/100
✓ WA Utility-Approved Tester Verified ★ 3.8 (67 reviews) On City of Bellevue list Backflow Testing

5005 3rd Ave S, Seattle, WA 98134 · 14 mi from Redmond

Call (206) 762-3311 Details Website
Verified Oct 2026 · Unclaimed listing

Iliad, Inc.

90/100
✓ WA Utility-Approved Tester Verified On City of Bellevue list Backflow Testing

1107 S Bailey St, Seattle, WA 98108 · 14 mi from Redmond

Call (206) 282-4200 Details Website
Verified Oct 2026 · Unclaimed listing

SJS Mechanical

90/100
✓ WA Utility-Approved Tester Verified On City of Bellevue list Backflow Testing

309 S Cloverdale St, Seattle, WA 98108 · 16 mi from Redmond

Call (206) 763-0334 Details Website
Verified Oct 2026 · Unclaimed listing

Columbia Fire

90/100
✓ WA Utility-Approved Tester Verified ★ 4.9 (27 reviews) On City of Bellevue listOn City of Sumner list Backflow Testing

9520 10th Ave S #150, Seattle, WA 98108 · 16 mi from Redmond

Call (206) 232-8569 Details Website
Verified Oct 2026 · Unclaimed listing

All Phase Plumbing

90/100
✓ WA Utility-Approved Tester Verified ★ 4.8 (52 reviews) On City of Bellevue list Backflow Testing

14101 Interurban Ave S Unit 78-A, Tukwila, WA 98168 · 17 mi from Redmond

Call (206) 772-6077 Details Website
Verified Oct 2026 · Unclaimed listing

Uyeta Landscape

90/100
✓ WA Utility-Approved Tester Verified ★ 4.4 (79 reviews) On City of Bellevue list Backflow Testing

19605 106th Ave SE, Renton, WA 98055 · 19 mi from Redmond

Call (253) 859-8589 Details Website
Verified Oct 2026 · Unclaimed listing

CopperWorks Plumbing

90/100
✓ WA Utility-Approved Tester Verified ★ 4.5 (16 reviews) On City of Bellevue list Backflow Testing

5714 Parkview Ln, Everett, WA 98203 · 19 mi from Redmond

Call (206) 914-2085 Details Website
Verified Oct 2026 · Unclaimed listing

Price reports

What a backflow test costs in Redmond

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Published prices nationwide

$29.99 to $100 per assembly

Based on 14 published prices · Read Oct 2026 Prices testing businesses list on their own websites, from our cost guide. Listed prices, not what people paid.

Every published price, with its source: what a backflow test costs.

Failed test? Published repair, rebuild and replacement prices: what a backflow repair or replacement costs.

Had your backflow test done? Share what you paid to see local prices.

Metro guide: Backflow testing in Seattle: every utility's rules, filing portals and published prices in one place.

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Most water utilities require the backflow assembly on an irrigation, fire or commercial line to be tested every year, and a missed test can mean a shutoff notice. Tell us when yours was last tested in Redmond and we'll text you a month before it is due, with certified local testers ready to book.

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Backflow testing questions in Redmond

Where are the backflow testing businesses listed for Redmond based?

37 backflow testing businesses are listed within 25 miles of Redmond. 2 are based in Redmond itself, 18 more within 15 miles and 17 further out, up to 24 miles away. Other towns with more than one listing: Seattle (9), Bellevue (4) and Renton (4). The closest is Nor-Tech Fire Protection, under 1 mile from Redmond.

Which tester lists are the businesses near Redmond on?

Every one is on the approved tester list of 5 water utilities.

How many of the backflow testing businesses near Redmond have Google reviews?

32 of the 37 listed for Redmond have 3 or more Google reviews. Day & Nite Plumbing & Heating has the most reviews, 1,847, with an average of 4.8 stars, as Google showed them at our last check.

Approved list: City of Bellevue backflow testing companies, City of Bellevue Utilities.

Approved list: Washington Water companies with certified backflow testers, Washington Water Service.

Approved list: City of Spokane backflow assembly testers, City of Spokane Water Department.

Approved list: City of Olympia certified backflow testers, City of Olympia Drinking Water Utility.

Approved list: Clark Public Utilities list of Washington State certified backflow testers, Clark Public Utilities.

Approved list: City of Lacey certified backflow assembly testers (BAT) list, City of Lacey Public Works.

Approved list: City of Yakima certified backflow prevention assembly testers, City of Yakima Water/Irrigation Division.

Approved list: City of Ridgefield approved backflow assembly testers, City of Ridgefield Public Works.

Approved list: City of Sumner approved backflow assembly testers, City of Sumner.

Approved list: City of DuPont certified backflow prevention assembly testers, City of DuPont Public Works.

Approved list: City of Snoqualmie backflow assembly testers, City of Snoqualmie.

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