Plumbing Firms Providing Cross Connection-Related Services
List updated July 8, 2026
WSSC Water compiled this consolidated list of plumbing firms as a convenience for our customers. Inclusion on this list is voluntary and intended to identify those firms that have declared they provide cross-connection/backflow preventer-related plumbing services. WSSC Water has verified that firms on this list are licensed to perform these services.
WSSC Water does not endorse or recommend any company on this list nor does WSSC Water set pricing by these companies. WSSC Water suggests that customers obtain several estimates before hiring a plumbing firm to test your backflow preventer or provide any other plumbing services.
Firms requesting addition to or removal from this list must contact WSSC Water's Licensing Specialist available through email at [email protected] or by phone at 301-206-8588.
This list does not represent all licensed plumbing firms and customers may use any WSSC Water-licensed plumbing firm. Though this list is periodically reviewed, registered firms’ statuses are updated daily on our My WSSC Water portal. Customers can learn more by using the "Find a Plumber" option of our ePermitting Permit and Licensee Search.
| Company Name | Phone Number |
|---|---|
| AA Rooter, LLC | 301-924-3033 |
| A & B Luck Plumbing & Heating, Inc. | 301-253-5283 |
| Acker & Sons | 301-897-0700 |
| Acme Plumbing, LLC | 301-352-0800 |
| All Around Plumbing, Inc. | 301-829-6745 |
| All Season Plumbing, Heating & A/C | 301-277-1313 |
| Alpha 1 Plumbing, Inc. | 240-508-4592 |
| Alpha Plumbing LTD, Inc. | 410-255-5998 |
| AM Bell Plumbing | 301-750-2258 |
| American Combustion Industries, Inc. | 301-779-3400 |
| American Masters Plumbing Co., LLC | 301-643-6138 |
| Apperson Plumbing, Inc. | 301-870-1022 |
| Aquaflow Plumbing & Heating Services, Inc. | 240-876-8719 |
| Arthur M. Black, Inc. | 301-776-7520 |
| Aspen Hill Plumbing | 301-933-0801 |
| Associates Plumbing | 301-343-5349 |
| Backflow Technology, LLC | 703-450-5898 |
| Benjamin F. Gartrell & Sons Plumbing & Heating | 301-421-9088 |
| B. McCall Plumbing & Heating | 301-868-7080 |
| Bonds & Bonds Plumbing, LLC | 301-283-2120 |
| Borchers Mechanical Services, Inc. | 301-879-3040 |
| B’s Plumbing | 240-507-4100 |
| B-Tek, LLC | 410-956-5994 |
| Burco Plumbing Corp. | 443-532-5253 |
| Capitol Boiler Works | 703-599-4324 |
| Clarksburg Plumbing, LLC | 301-972-2223 |
| Complete Building Services | 202-625-5526 |
| CRW Mechanical, Inc. | 301-918-0056 |
| Durance Plumbing | 301-270-6663 |
| Ellis Jones Plumbing & Heating | 202-437-5063 |
| Eternity Plumbing, Inc. | 240-988-2625 |
| Fireplaces by Bromwell | 202-409-8246 |
| First Call Plumbing | 301-261-4605 |
| First Class Plumbing, LLC | 301-916-2700 |
| Flow Rite, Inc. | 301-829-4500 |
| Focused Plumbing & Gas | 301-213-2242 |
| Free Line, Inc. | 301-499-0987 |
| G.A. Eberly Plumbing & Heating | 301-856-6900 |
| Gaithersburg Plumbing, Inc. | 301-948-8856 |
| Genevie Plumbing, Inc. | 301-645-1759 |
| Gladhill Plumbing & Heating, Inc. | 301-898-3875 |
| Guardian Plumbing Services, Inc. | 301-261-7481 |
| Harvey W. Hottel, Inc. | 301-921-9599 |
| Heffron Company, Inc. | 301-816-2088 |
| Heil Plumbing | 301-604-7306 |
| HMS Plumbing, LLC | 703-583-8205 |
| Jack A. Mettee Plumbing & Heating | 301-926-8333 |
| James A. Wheat & Sons | 301-670-1944 |
| James Mettee Plumbing & Heating | 301-831-9626 |
| James Vito, Inc. | 301-251-0211 |
| Jiffy Plumbing & Heating, Inc. | 301-277-9111 |
| JPG Plumbing and Mechanical, Inc. | 240-241-5060 |
| J.P. Spadaro & Sons, Inc. | 301-779-4455 |
| Kastner Plumbing & Heating, Inc. | 301-725-5000 |
| Lawver Plumbing, Inc. | 443-250-4786 |
| Leahy Plumbing & Heating, Inc. | 301-652-0478 |
| Len the Plumber, Inc. | 301-222-1500 |
| Madden Plumbing & HVAC | 301-937-1000 |
| Magnolia Plumbing, Inc. | 202-829-8510 |
| Mahon Plumbing, Inc. | 410-636-7944 |
| Mallick Plumbing & Heating | 301-840-5861 |
| Martins HVAC Plumbing Service | 571-221-0998 |
| McDevitt & Sons Plumbing & Heating | 410-553-6794 |
| Mechanical, Electrical, & Plumbing Partners | 703-369-8914 |
| Mech-Flow Corporation | 301-343-5705 |
| M.H. Barnes, Inc. | 301-654-1441 |
| Mid-Atlantic Plumbing & Water Treatment | 410-573-1020 |
| Nature Unlimited | 443-398-5640 |
| Naumann Plumbing, LLC | 443-262-6199 |
| N & E Plumbing, LLC | 571-484-9006 |
| Niagara Plumbing, Inc. | 240-793-0555 |
| Nick DiBattista Plumbing & Heating, Inc. | 301-309-1644 |
| O’Connor Plumbing, LLC | 301-540-5050, extension 4 |
| O’Donnell Plumbing | 301-831-4332 |
| Patriot Backflow & Gas, Inc. | 443-508-6157 |
| PDG Services | 240-793-2163 |
| Petra Contractors, Inc. | 410-544-9900 |
| Plumb Right Plumbing | 301-808-3600 |
| Pressley Plumbing & Gas | 301-674-3120 |
| Raine & Son, LLC | 301-864-1122 |
| R.A.M. Plumbing | 301-606-3030 |
| Raymar Plumbing Services, Inc. | 301-772-7482 |
| Reign Plumbing and Gas | 240-462-1651 |
| R.L. Voight & Son, LLC | 301-946-6100 |
| Robert A. Tull, Inc. | 301-948-2490 |
| R & R Mechanical, LLC | 202-636-9451 |
| Roto Rooter Services Company | 443-790-3995 |
| Russell R. Dwyer, Inc. | 410-647-3030 |
| Shary’s Plumbing | 301-229-6695 |
| Smith Mechanical, Inc. | 410-992-9570 |
| Stang Plumbing, Inc. | 301-926-1462 |
| Thomas Plumbing & Heating | 301-933-5995 |
| Tim Downs Plumbing Co., Inc. | 301-440-1632 |
| Tri-State Home Services, LLC | 301-624-5970 |
| Unlimited Plumbing & Heating | 240-375-4945 |
| Walls Plumbing & Heating | 301-855-1485 |
| Warner Super Services, Inc. | 301-567-2001 |
| Welch & Rushe | 301-430-6000 |
| W.E Bowers & Associates, LLC | 301-419-2488 |
| W.L. Gary Co., Inc. | 202-723-0676 |
Last Modified: July 10, 2026, 2:12 pm EDT