BackflowNear Test-Due Reminder

Approved backflow testers in Longmont, CO

25 backflow testing businesses work within 25 miles of Longmont, 7 of them based in town. Every one is on the approved tester list of 4 water utilities.

25 businesses within 25 miles

Backflow testing companies near Longmont

What the badges mean
✓ CO 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 Longmont? One sponsor per county, clearly labelled. Sponsor this county

Solid Grounds Inc.

90/100
✓ CO Utility-Approved Tester Verified ★ 4.7 (38 reviews) On City of Longmont list Backflow Testing

1885 Vista View Dr Unit a, Longmont, CO 80504 · under 1 mile from Longmont

Call (303) 651-1087 Details Website
Verified Oct 2026 · Unclaimed listing

Streamline Plumbing, LLC

90/100
✓ CO Utility-Approved Tester Verified ★ 4.9 (161 reviews) On City of Longmont listOn Town of Berthoud list Backflow Testing

1740 Skyway Dr, Longmont, CO 80504 · under 1 mile from Longmont

Call (303) 772-2250 Details Website
Verified Oct 2026 · Unclaimed listing

Pro Service Co

90/100
✓ CO Utility-Approved Tester Verified ★ 4.2 (15 reviews) On City of Longmont list Backflow Testing

41 3rd Ave B, Longmont, CO 80501 · 4 mi from Longmont

Call (303) 772-2803 Details Website
Verified Oct 2026 · Unclaimed listing

McCrary and Sons

90/100
✓ CO Utility-Approved Tester Verified ★ 3.7 (33 reviews) On Town of Berthoud list Backflow Testing

275 Co Rd 48, Berthoud, CO 80513 · 12 mi from Longmont

Call (307) 761-0200 Details Website
Verified Oct 2026 · Unclaimed listing

Total Fire Protection, Inc

90/100
✓ CO Utility-Approved Tester Verified ★ 2.3 (21 reviews) On City of Longmont listOn Town of Berthoud list Backflow Testing

80 Gateway Cir, Berthoud, CO 80513 · 12 mi from Longmont

Call (970) 613-1370 Details Website
Verified Oct 2026 · Unclaimed listing

Design Mechanical Inc

90/100
✓ CO Utility-Approved Tester Verified ★ 4.1 (24 reviews) On Eagle River Water & Sanitation list Backflow Testing

312 Ctc Blvd, Louisville, CO 80027 · 14 mi from Longmont

Call (303) 449-2092 Details Website
Verified Oct 2026 · Unclaimed listing

Murphy Company

90/100
✓ CO Utility-Approved Tester Verified ★ 3.8 (52 reviews) On City of Longmont list Backflow Testing

12789 Emerson St, Thornton, CO 80241 · 16 mi from Longmont

Call (303) 371-6600 Details Website
Verified Oct 2026 · Unclaimed listing

Mtech Mechanical

90/100
✓ CO Utility-Approved Tester Verified ★ 4.3 (81 reviews) On City of Longmont listOn Town of Berthoud list Backflow Testing

12300 N Pecos St, Westminster, CO 80234 · 17 mi from Longmont

Call (303) 650-4000 Details Website
Verified Oct 2026 · Unclaimed listing

Procraft Mechanical

90/100
✓ CO Utility-Approved Tester Verified ★ 3.5 (25 reviews) On City of Longmont list Backflow Testing

2400 Industrial Ln #500, Broomfield, CO 80020 · 17 mi from Longmont

Call (303) 952-8668 Details Website
Verified Oct 2026 · Unclaimed listing

Cintas Fire Protection

90/100
✓ CO Utility-Approved Tester Verified ★ 4.6 (171 reviews) On Eagle River Water & Sanitation listOn City of Longmont listOn Town of Berthoud list Backflow Testing

1100 W 120th Ave #500, Westminster, CO 80234 · 18 mi from Longmont

Call (303) 993-1622 Details Website
Verified Oct 2026 · Unclaimed listing

Martin Fire Protecton Inc

80/100
✓ CO Utility-Approved Tester Verified ★ 3 (4 reviews) On City of Longmont list Backflow Testing

12295 Pennsylvania St #4b, Thornton, CO 80241 · 17 mi from Longmont

Call (303) 425-6678 Details
Verified Oct 2026 · Unclaimed listing

Top Notch Plumbing

90/100
✓ CO Utility-Approved Tester Verified ★ 4.8 (422 reviews) On Town of Berthoud list Backflow Testing

3005 W 29th St D, Greeley, CO 80631 · 22 mi from Longmont

Call (970) 404-7586 Details Website
Verified Oct 2026 · Unclaimed listing

Advanced Backflow LLC

80/100
✓ CO Utility-Approved Tester Verified On Town of Berthoud list Backflow Testing

4550 W 90th Ave, Westminster, CO 80031 · 21 mi from Longmont

Call (303) 427-5556 Details
Verified Oct 2026 · Unclaimed listing

Price reports

What a backflow test costs in Longmont

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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.

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Backflow testing questions in Longmont

Where are the backflow testing businesses listed for Longmont based?

25 backflow testing businesses are listed within 25 miles of Longmont. 7 are based in Longmont itself, 5 more within 15 miles and 13 further out, up to 24 miles away. Other towns with more than one listing: Westminster (4), Berthoud (3) and Loveland (2). The closest is Solid Grounds Inc., under 1 mile from Longmont.

Which tester lists are the businesses near Longmont on?

Every one is on the approved tester list of 4 water utilities.

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

23 of the 25 listed for Longmont have 3 or more Google reviews. Balance Point Heating Cooling & Plumbing has the most reviews, 561, with an average of 4.9 stars, as Google showed them at our last check.

Approved list: City of Longmont backflow tester contact list, City of Longmont Water.

Approved list: Colorado Springs Utilities registered backflow testers, Colorado Springs Utilities.

Approved list: Eagle River Water & Sanitation District certified backflow test company directory, Eagle River Water & Sanitation District.

Approved list: Town of Berthoud backflow inspection and testing companies (tested in 80513), Town of Berthoud.

Approved list: City of Aspen certified backflow tester list, City of Aspen Utilities.

Approved list: Cherokee Metropolitan District backflow tester list, Cherokee Metropolitan District.

Approved list: City of Grand Junction certified backflow tester list, City of Grand Junction Water Services.

Approved list: Security WSD approved list of certified backflow testers, Security Water and Sanitation Districts.

Approved list: City of Durango licensed and certified cross connection control testers, City of Durango Cross Connection Control Program.

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