BackflowNear Test-Due Reminder

Approved backflow testers in Monrovia, MD

9 backflow testing businesses work within 25 miles of Monrovia, 2 of them based in town. 2 have testers on Maryland's roster and 7 are on the approved tester list of 4 water utilities.

9 businesses within 25 miles

Backflow testing companies near Monrovia

What the badges mean
✓ MD Certified Backflow Tester Verified
A state roster lists at least one certified tester at this business, with a current certificate. The state sets the exam and renewal.
✓ MD 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.

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Shary's Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4 (29 reviews) On DC Water listOn WSSC Water listOn City of Rockville list Backflow Testing

3401 Kemptown Church Rd, Monrovia, MD 21770 · 15 mi from Monrovia

Call (301) 229-6695 Details Website
Verified Oct 2026 · Unclaimed listing

Ben Lewis Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 2.6 (38 reviews) On Anne Arundel County list Backflow Testing

23407 Frederick Rd, Clarksburg, MD 20871 · 22 mi from Monrovia

Call (301) 428-3900 Details Website
Verified Oct 2026 · Unclaimed listing

Delmar Plumbing, LLC

80/100
✓ MD Utility-Approved Tester Verified ★ 3.3 (16 reviews) On DC Water list Backflow Testing

2 Hilton Ct, Gaithersburg, MD 20882 · 25 mi from Monrovia

Call (301) 774-2355 Details
Verified Oct 2026 · Unclaimed listing

Price reports

What a backflow test costs in Monrovia

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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.

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Backflow testing questions in Monrovia

Where are the backflow testing businesses listed for Monrovia based?

9 backflow testing businesses are listed within 25 miles of Monrovia. 2 are based in Monrovia itself, 5 more within 15 miles and 2 further out, up to 25 miles away. Other towns with more than one listing: Frederick (3) and Walkersville (2). The closest is Premier Fire Protection Services, LLC in Walkersville, 8 miles from Monrovia.

Which tester lists are the businesses near Monrovia on?

2 have testers on Maryland's roster and 7 are on the approved tester list of 4 water utilities.

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

7 of the 9 listed for Monrovia have 3 or more Google reviews. All Around Plumbing Inc. has the most reviews, 377, with an average of 4.8 stars, as Google showed them at our last check.

Approved list: WSSC Water plumbing firms providing cross-connection related services, WSSC Water.

Approved list: Backflow Prevention Assembly Service Providers, DC Water.

Approved list: Anne Arundel County accepted plumbing companies providing backflow related services, Anne Arundel County Department of Public Works.

Approved list: City of Rockville certified backflow prevention testers, City of Rockville Department of Public Works.

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