Backflow specialty contractors
54 active registrations, specialty “Backflow specialty” as L&I records it.
| Place | Contractor | License | Specialty | Expires |
|---|---|---|---|---|
| Kirkland, WA | 5 STAR BACKFLOW SERVICES INC | 5STARSB785RZ | Backflow specialty | Jan 9, 2027 |
| Everett, WA | AAA BACKFLOW ASS TS & SERV LLC | AAABABA744DU | Backflow specialty | Mar 31, 2028 |
| Camano Island, WA | AAA BACKFLOW ASY TSTNG/SVC LLC | AAABABA781PQ | Backflow specialty | Oct 18, 2026 |
| Seattle, WA | AAA FIRE PROTECTION INC | AAAFIFP777PZ | Backflow specialty | Sep 29, 2027 |
| Snohomish, WA | AACRA BACKFLOW TESTING/REPAIR | AACRABT795PD | Backflow specialty | Mar 4, 2028 |
| Bellingham, WA | ADAGIO BACKFLOW TESTING | ADAGIBT759RA | Backflow specialty | Dec 18, 2027 |
| Marysville, WA | ADVANCE TESTING & SERVICE INC | ADVANTS782PL | Backflow specialty | Oct 10, 2028 |
| East Wenatchee, WA | AFFINITY HOME SOLUTION | AFFINHS779J1 | Backflow specialty | May 11, 2027 |
| Cle Elum, WA | AFFORDABLE WASHINGTN BKFLW LLC | AFFORWB789JR | Backflow specialty | May 2, 2028 |
| Mountlake Terrace, WA | ALWAYS TESTING INC | ALWAYTI782L7 | Backflow specialty | Jun 28, 2028 |
| Puyallup, WA | APEX BACKFLOW SERVICES | APEXBBS776P7 | Backflow specialty | Dec 20, 2027 |
| Kent, WA | ARCHER CONSTRUCTION INC | ARCHECI768PS | Backflow specialty | Oct 9, 2028 |
| Lacey, WA | BACKCOUNTRY BACKFLOW LLC | BACKCBL775RQ | Backflow specialty | Dec 18, 2027 |
| Kingston, WA | BACKFLOW ASSEMBLY SLTNS INC | BACKFAS760K4 | Backflow specialty | May 24, 2028 |
| Gig Harbor, WA | Backflow For Business | BACKFFB743C5 | Backflow specialty | Feb 24, 2028 |
| Pasco, WA | Backflow Tri-Cities LLC | BACKFTL774LZ | Backflow specialty | Jun 9, 2027 |
| Blaine, WA | BAT PRO BACKFLOW SERVICES LLC | BATPRPB786LP | Backflow specialty | Jul 27, 2028 |
| Aberdeen, WA | BRENNEMAN'S BACKFLOW TSTNG LLC | BRENNBT745DT | Backflow specialty | Mar 30, 2028 |
| Chelan, WA | CHELAN BACKFLOW LLC | CHELABL744JZ | Backflow specialty | Apr 17, 2028 |
| Oak Harbor, WA | CK BACKFLOW LLC | CKBACBL748BG | Backflow specialty | Jan 7, 2028 |
| Kennewick, WA | COFFEY REFRIGERATION | COFFER*789DA | Backflow specialty | Mar 7, 2027 |
| Seattle, WA | COLUMBIA FIRE LLC | COLUMFL755RR | Backflow specialty | Dec 19, 2027 |
| Tukwila, WA | COSCO FIRE PROTECTION INC | COSCOFP784P7 | Backflow specialty | Oct 26, 2028 |
| Puyallup, WA | Cross Connection Services | CROSSCS773RG | Backflow specialty | Nov 14, 2027 |
| Seattle, WA | Dixon Backflow Testing LLC | DIXONBT751RQ | Backflow specialty | Dec 12, 2027 |
| Maple Falls, WA | DOUBLE CHECK WATERWORKS | DOUBLCW746KE | Backflow specialty | May 5, 2028 |
| Gig Harbor, WA | EMERALD FIRE LLC | EMERAFL749DT | Backflow specialty | Mar 19, 2028 |
| Bremerton, WA | EMPIRE FIRE PROTECTION | EMPIRFP762NR | Backflow specialty | Sep 12, 2028 |
| South Prairie, WA | EVERGREEN BACKFLOW LLC | EVERGBL742MN | Backflow specialty | Jul 15, 2028 |
| Everett, WA | FIRE SUPPRESSION SYSTEMS LLC | FIRESSS754LF | Backflow specialty | Jun 6, 2027 |
| Tacoma, WA | FIX-IT-PHIL BACKFLOW SVCS LLC | FIXITBS753N6 | Backflow specialty | Aug 26, 2027 |
| Shoreline, WA | FLOW SIX INC | FLOWSSI785BU | Backflow specialty | Feb 4, 2028 |
| Bingen, WA | FLUME ROAD WATER SERVICES LLC | FLUMERW787C4 | Backflow specialty | Mar 9, 2028 |
| Tukwila, WA | FROULA ALARM SYSTEMS INC | FROULAS791OS | Backflow specialty | Oct 7, 2027 |
| Pacific, WA | GREEN EFFECTS INC | GREENEI755CL | Backflow specialty | Mar 5, 2027 |
| Granite Falls, WA | JACK'S BACKFLOW TESTING LLC | JACKSBT742JB | Backflow specialty | Apr 20, 2028 |
| Cashmere, WA | JM WATERWORKS | JMWATW*772N4 | Backflow specialty | Sep 28, 2027 |
| Tumwater, WA | MCLM LLC | MCLMLL*788JH | Backflow specialty | Apr 4, 2028 |
| West Richland, WA | MID-COLUMBIA BACKFLOW LLC | MIDCOBL763P2 | Backflow specialty | Oct 22, 2026 |
| Kent, WA | NORTHWEST FIRE SYSTEMS LLC | NORTHFS790NU | Backflow specialty | Sep 13, 2027 |
| Lynnwood, WA | OPTIMAL BACKFLOW LLC | OPTIMBL743JC | Backflow specialty | Apr 6, 2028 |
| Richland, WA | PACIFIC BACKFLOW SERVICES LLC | PACIFBS797ON | Backflow specialty | Sep 1, 2027 |
| Tacoma, WA | PATRIOT FIRE PROTECTION INC | PATRIFP788MJ | Backflow specialty | Jul 5, 2028 |
| Kirkland, WA | PYE-BARKER FIRE & SAFETY LLC | PYEBAFS741BG | Backflow specialty | Feb 6, 2028 |
| Puyallup, WA | RED HAWK FIRE PROTECTION LLC | REDHAHF772DP | Backflow specialty | Jun 9, 2027 |
| Redmond, WA | REDWOOD BACKFLOW | REDWOB*794PL | Backflow specialty | Oct 21, 2027 |
| Tacoma, WA | SMITH FIRE SYSTEMS INC | SMITHFS748DP | Backflow specialty | Mar 17, 2028 |
| Des Moines, WA | STEWIE'S FIRE PROTECTION LLC | STEWIFP753JH | Backflow specialty | Apr 8, 2027 |
| Saint Paul, MN | SUMMIT FIRE & SECURITY LLC | SUMMIFS741N4 | Backflow specialty | Sep 4, 2028 |
| Port Angeles, WA | WEST COAST BACKFLOW SERV LLC | WESTCCB762KT | Backflow specialty | May 30, 2028 |
| Bothell, WA | WESTERN STATES FIRE PRTCTN CO | WESTESF794O9 | Backflow specialty | Jul 19, 2028 |
| Issaquah, WA | White Knight Fire Protectn INC | WHITEKF798MG | Backflow specialty | Aug 30, 2027 |
| Port Angeles, WA | WRIGHT'S BACKFLOW SERVICES LLC | WRIGHBS758MG | Backflow specialty | Aug 12, 2027 |
| Sequim, WA | ZACH'S BACKFLOW SERVICE LLC | ZACHSBS762JR | Backflow specialty | Apr 19, 2028 |
Alphabetical order — this site ranks no one. Active company registrations in the L&I contractor files of October 2, 2026. Contractors registered as individuals are not on this site. How to read this.