| B7085 | Agnor, Philip | (541) 490-4025 | philip@midcolumbiabackflow.com | Klickitat |
| B6707 | Al Shakerchi, Nabeel | (253) 243-4230 | | King |
| B6284 | Allenfort, Craig | (425) 923-7585 | stopbackflow@hotmail.com | Snohomish |
| B7703 | Allenfort, Jack | (425) 495-1939 | redwoodbackflow@hotmail.com | King |
| B5245 | Aloisio, Joseph | (253) 537-9606 | | Pierce |
| B3617 | Anderson, Dennis | (509) 386-8751 | | Walla Walla |
| B5377 | Anderson, Michael | (360) 320-9871 | gcfbackflow@gmail.com | King |
| B8066 | Anthony, Irina | (206) 906-9279 | info@anthonysplumbingcompany.com | King |
| B6906 | Arndt, Larry | (206) 366-0913 | larry@pacificlandscapinginc.com | King |
| B7518 | Arthurs, Kellson | (360) 297-9586 | info@swiftplumb.com | Kitsap |
| B7208 | Asay, Steven | (509) 398-1591 | basinbackflow@gmail.com | Grant |
| B4738 | Au, Greg | (509) 922-7168 | | Spokane |
| B7477 | Baggett, Scott | (425) 210-6007 | office@scottsturfandtree.com | Snohomish |
| B7348 | Ballance, Nathan | (509) 675-9933 | nballance76@icloud.com | Stevens |
| B2970 | Bandy, Randall | (503) 810-7505 | | Clark |
| B6681 | Barba Perez, Manuel | (425) 569-9252 | manny@backflowsystems.net | King |
| B6604 | Bardsley, Megan | (206) 353-4816 | | Snohomish |
| B6589 | Barfield, Mark | (360) 893-5419 | cascadebackflowservices@gmail.com | Pierce |
| B7302 | Barnett, Mark | (425) 306-1558 | dubar@comcast.net | King |
| B5765 | Barnhart, Jon | (509) 951-4864 | | Spokane |
| B7375 | Baroumes, Brendin | (253) 720-0537 | baroumesbackflows@gmail.com | Pierce |
| B7435 | Bastin, Chris | (509) 951-3914 | bastin02@comcast.net | Spokane |
| B3632 | Baxmann, Dale | (206) 795-9192 | | King |
| B1791 | Beahm, Steven | (360) 340-5640 | | Kitsap |
| B7443 | Beardsworth, Alfred | (360) 954-6962 | fredbeardsworth7@gmail.com | Clark |
| B5922 | Beary Andersen, Casey | (206) 334-1861 | | King |
| B6967 | Bessey, Michael | (509) 432-4317 | | Whitman |
| B7359 | Black, Cameron | (509) 764-1849 | office@moseslakeplumber.com | Grant |
| B6448 | Blaufuss, Randy | (509) 669-8504 | dbbackflow@gmail.com | Chelan |
| B6566 | Bodamer, Ronald | (360) 969-1595 | | Island |
| B7504 | Bolle, Aaron | (877) 380-7904 | info@stopinc.com | Kitsap |
| B2992 | Bottcher, Shawn | (253) 414-2239 | shawncb45@comcast.net | Pierce |
| B8123 | Boyd, Tracy | (360) 791-2211 | Tracyeboyd@outlook.com | Thurston |
| B1129 | Boylan, Bruce | (360) 993-1772 | | Clark |
| B6596 | Brazeau, Mark | (360) 550-6865 | | Kitsap |
| B6834 | Brenneman, Anna | (360) 589-4163 | ahuett33@gmail.com | Grays Harbor |
| B7976 | Brenneman, Joseph | (360) 580-7267 | j.brenneman@outlook.com | Grays Harbor |
| B4109 | Brewer, Martin | (253) 405-8712 | | Pierce |
| B4770 | Bright, Timothy | (360) 914-0321 | | Island |
| B5560 | Briody, Arnica | (509) 860-5423 | | Chelan |
| B5452 | Brooks, Charles | (425) 359-7462 | | Whatcom |
| B7916 | Brown, Ryan | (253) 851-0030 | service@fireshieldinc.com | Pierce |
| B6543 | Brown, Clifton | (877) 380-7904 | info@stopinc.com | Snohomish |
| B6113 | Brown, Andrew | (206) 818-6549 | | King |
| B6620 | Bucknam, Matthew | (253) 987-9777 | | Pierce |
| B6296 | Buff, Daniel | (253) 970-0244 | | Pierce |
| B7680 | Burdick, Michelle | (509) 342-8590 | aallrite.llc@gmail.com | Spokane |
| B0800 | Burger, Timothy | (509) 922-8900 | lilacitysprinklr@aol.com | Spokane |
| B5950 | Burke, Joseph | (360) 739-0049 | SalishBackflow@gmail.com | Whatcom |
| B7333 | Burnam, Danny | (425) 244-6140 | burnamdanny41@gmail.com | Snohomish |
| B4463 | Burns, Bruce | (509) 489-6353 | | Spokane |
| B7006 | Caldeira, David | (425) 652-7502 | | King |
| B3751 | Calis, Simon | (253) 405-2356 | | King |
| B3674 | Campbell, Donald | (509) 954-5524 | dcampbell@whitworth.edu | Lincoln |
| B4355 | Campbell, Bradley | (253) 531-0940 | | Pierce |
| B6652 | Campbell, Mark | (253) 606-1301 | | Pierce |
| B3301 | Cantwell, Timothy | (425) 770-1869 | | Snohomish |
| B4335 | Carlson, Terry | (509) 595-7198 | | Whitman |
| B5906 | Carney, Thomas | (509) 951-1651 | | Spokane |
| B2560 | Carucci, Frank | (206) 432-1599 | | King |
| B5823 | Case, Jordan | (509) 547-4911 | | Franklin |
| B3722 | Catania, Gino | (360) 907-1519 | | Cowlitz |
| B5732 | Chastain, Donald | (877) 380-7904 | | Pierce |
| B5051 | Choate, Jason | (360) 480-0447 | advancedbackflowsolutions@gmail.com | Thurston |
| B7939 | Church, Steve | (509) 570-2599 | irrigation@environmentwest.com | Spokane |
| B5988 | Clark, Jacob | (360) 256-9838 | | Clark |
| B7358 | Clift, Trevor | (509) 844-1436 | clifttrevor@gmail.com | Spokane |
| B4591 | Clifton, Lee | (360) 975-1728 | | Clark |
| B6423 | Cobb, Joshua | (360) 631-0039 | aacrabackflow@gmail.com | King |
| B5945 | Cochran, Jeffrey | (509) 438-0954 | | Franklin |
| B1807 | Coke, Steve | (360) 701-9963 | | Thurston |
| B7992 | Coleman, Branden | (360) 821-3231 | branden@premiersnw.com | Snohomish |
| B5518 | Coleman, Martin | (509) 599-6314 | macbackflow@gmail.com | Spokane |
| B7615 | Collins, River | (253) 951-1138 | Riverkcollins@gmail.com | King |
| B7054 | Collins, Marie | (206) 571-8972 | mrsmariecollins@gmail.com | King |
| B3021 | Conner, Norman | (253) 223-1554 | normconner@aol.com | Pierce |
| B5292 | Cook, Brad | (509) 432-3148 | waookia@outlook.com | Whitman |
| B7702 | Coombes Jr., Michael | (425) 427-8889 | info@certified-backflowtesting.com | King |
| B7187 | Corchado-Regalado, Adalberto | (425) 359-0730 | alngaby@gmail.com | Snohomish |
| B7660 | Crank, Cody | (253) 370-8944 | Cody@ccs-testing.com | Pierce |
| B8006 | Cranston, Trey | (509) 770-0005 | Tc99ranston@gmail.com | Grant |
| B5040 | Cruz, Antonio | (206) 251-6753 | | King |
| B4574 | Curl, Travis | (509) 209-7461 | | Spokane |
| B8146 | Cypher, Dustin | (360) 219-7670 | dustin_443@hotmail.com | Pierce |
| B5261 | Czarnecki, Alan | (425) 773-6065 | | Snohomish |
| B6129 | Dawkins, Brandon | (509) 528-2131 | | Benton |
| B5927 | DeFreece, DJ | (425) 485-7758 | | King |
| B6363 | Delaney, Dale | (509) 968-4024 | | Yakima |
| B5145 | Dennehy, Sean | (206) 919-9235 | dennehysbackflow@hotmail.com | Kittitas |
| B7528 | DePaulo, Brandon | (509) 951-7912 | brandondepaulo@yahoo.com | Spokane |
| B5099 | Diaz, Juan | (425) 765-6231 | rgzservices@live.com | King |
| B4888 | Diefenbach, Paul | (509) 899-7285 | | Yakima |
| B7294 | Dills, Paul | (253) 366-3700 | dillstestingservices@gmail.com | King |
| B4981 | Dixon, Mark | (206) 861-3578 | dixonx25@gmail.com | King |
| B6640 | Doherty, John | (206) 931-2595 | aquamatters@outlook.com | Snohomish |
| B3921 | Dravis, James | (253) 227-8858 | | Pierce |
| B2121 | Dupleich, Bradley | (253) 854-0714 | | King |
| B7868 | Eaton, Robert | (253) 343-4269 | Reaton12th@gmail.com | Pierce |
| B6510 | Ebert, Kenneth | (562) 673-6741 | shaman6891@gmail.com | Clark |
| B1253 | Edlund, Marilyn | (425) 255-5726 | edlund33@comcast.net | King |
| B3249 | Eldridge, Mark | (509) 630-0635 | | Chelan |
| B6472 | Elliott, Joshua | (888) 698-2739 | apexbackflow1@gmail.com | Pierce |
| B7583 | Ellis, Julie-Nicole | (509) 237-3638 | Jul.cws@gmail.com | Grant |
| B4310 | Elwanger, Jeffrey | (360) 840-7359 | | King |
| B5202 | Farias, Jaime | (253) 709-5622 | BACKFLOWNIRRIGATION@GMAIL.COM | King |
| B6479 | Field, Jeff | (509) 630-0021 | | Chelan |
| B7115 | Finochio, Rachel | (360) 593-4525 | rfinochio@outlook.com | Skagit |
| B6312 | Fischbach, Jennifer | (253) 514-9935 | batlady@yahoo.com | Pierce |
| B7824 | Fitting, Brian | (360) 789-2258 | PrecisionBackflowTesting@outlook.com | Thurston |
| B3479 | Fitzpatrick, Josh | (360) 479-3473 | josh@firesolutionsnw.com | King |
| B6480 | Fleming, Darrin | (360) 857-8730 | | Clark |
| B6844 | Flores, Esdras | (225) 892-7399 | esdras_es_flores@hotmail.com | King |
| B5879 | Flynn, Anthony | (425) 228-3204 | | King |
| B8113 | Flynn, Tyler | (206) 779-1931 | Flynnplumbingllc@gmail.com | Pierce |
| B2939 | Foster, Ben | (206) 498-9996 | | King |
| B5134 | Foy, David | (425) 892-4808 | info@wabackflowllc.com | King |
| B4554 | Frey, Aaron | (253) 973-8522 | | Pierce |
| B4594 | Gamman, Thomas | (425) 210-9866 | | Snohomish |
| B6441 | Garcia, Roosevelt | (541) 571-0880 | | Benton |
| B8105 | Garcia Valdovinos, J | (509) 393-8363 | inocentelv@gmail.com | King |
| B3395 | Garnett, Nils | (253) 838-9780 | | King |
| B7587 | Garrett, Jordan | (425) 876-9210 | backflowtestingandrepairllc@gmail.com | King |
| B1630 | Gaughan, Dan | (425) 867-0409 | | Snohomish |
| B4772 | Geiger, Gannon | (509) 304-5457 | geiger396@gmail.com | Kittitas |
| B6291 | Gibson, Brian | (509) 968-4024 | | Kittitas |
| B5929 | Gibson, Matthew | (360) 657-0014 | 4bigdogs@frontier.com | Snohomish |
| B1423 | Gittings, Michael | (253) 297-4387 | | King |
| #B1423 | Gittings, Michael | (360) 692-8840 | info@silverdaleplumbing.com | Kitsap |
| B1972 | Glaser, Russell | (360) 694-3629 | | Clark |
| B7945 | Gottlieb, Grace | (360) 774-9029 | | San Juan |
| B6099 | Grant, Jeff | (509) 793-8022 | | Grant |
| B5889 | Grant, Travis | (425) 449-2072 | travisgrant@me.com | King |
| B7815 | Grassmyer, Mark | (509) 432-6079 | mgrassmyer@gmail.com | Spokane |
| B5758 | Greene, Cory | (360) 485-5699 | cgreene1323@gmail.com | Thurston |
| B7933 | Gresli, Jack | (425) 328-4031 | jackgresli@gmail.com | Snohomish |
| B3900 | Grimm, Kelly | (253) 606-1000 | | Pierce |
| B6285 | Grobler, Kyle | (253) 273-8727 | | Pierce |
| B7773 | Grove, Cameron | (360) 202-6357 | cjgrove8@gmail.com | Whatcom |
| B5406 | Gruver, David | (360) 556-0027 | | Thurston |
| B5448 | Guse, Richard | (509) 520-3739 | | Walla Walla |
| B6810 | Guzzo, Jackson | (253) 209-2282 | | Pierce |
| B5480 | Hale, Douglas | (509) 322-0581 | alpenviro@yahoo.com | Okanogan |
| B4133 | Hammrich, Dale | (360) 606-0870 | | Clark |
| B6073 | Hansen, Steven | (360) 981-0637 | | Grant |
| B6450 | Hansen, Jeffery | (206) 369-5660 | | Snohomish |
| B2642 | Hanson, Richard | (425) 778-5363 | | Snohomish |
| B5734 | Hanson, Mark | (877) 380-7904 | info@stopinc.com | Whatcom |
| B4103 | Hanson, Loren | (425) 427-8889 | info@certified-backflowtesting.com | King |
| B6690 | Hardtke, Kirk | (253) 380-8380 | | Pierce |
| B6789 | Hardwick, Zachary | (509) 590-8812 | | Spokane |
| B5740 | Harvill, Jeffery | (509) 771-2524 | | Grant |
| B5233 | Hays, Jared | (206) 255-5483 | | Pierce |
| B4763 | Hays, Matt | (360) 254-1448 | | Clark |
| B4941 | Heighway, Jeffrey | (425) 379-5455 | | Snohomish |
| B3787 | Hendrickson, Ronald | (360) 256-5852 | | Clark |
| B3513 | Heston, John | (208) 743-7742 | | Asotin |
| B3635 | Hilliker, Earl | (253) 988-8300 | mntrain29@live.com | Pierce |
| B0231 | Hobbs, Lane | (253) 229-8386 | | Pierce |
| B5078 | Hoff, Lance | (866) 924-3473 | | Clark |
| B5362 | Hofstad, Joel | (360) 424-3473 | | Skagit |
| B7975 | Holmes, Derek | (206) 529-7180 | ellensburgbackflow@gmail.com | Kittitas |
| B6561 | Holstad, Doug | (509) 332-3900 | sygnursery@pullman.com | Whitman |
| B4704 | Holt, John | (425) 324-1609 | arohli@yahoo.com | King |
| B7117 | Ivie, Jeffrey | (206) 886-1860 | | King |
| B5916 | Jensen, Kelly | (360) 736-6444 | kelly@djsplumbingllc.com | Lewis |
| B6098 | Johnson, Marc | (360) 303-4155 | | Whatcom |
| B7353 | Johnson, Chaz | (509) 494-3020 | johnsonchaz8762@gmail.com | Yakima |
| B7273 | Johnson, Christopher | (503) 333-2012 | Beaconbackflow@comcast.net | Clark |
| B4088 | Johnson, Anthony | (206) 909-2886 | | King |
| B6152 | Jones, Ilan | (360) 477-8673 | | Jefferson |
| B7617 | Jubinville, Sean | (509) 638-2084 | b.a.testing@outlook.com | Spokane |
| B7042 | Judd, Marlin | (509) 771-9977 | | Grant |
| B3664 | Judge, John | (360) 930-8220 | | Kitsap |
| B6115 | Jupin, Timothy | (360) 929-1184 | | Island |
| B7833 | Kachankov, Vladimir | (877) 376-2713 | officemngr@prolineplumbingandsewer.com | Clark |
| B0973 | Keeney, George | (425) 487-2180 | | King |
| B5579 | Keith, Kenneth | (206) 762-1450 | | King |
| B7421 | Kelley, Josh | (877) 380-7904 | info@stopinc.com | Pierce |
| B4060 | Kenny, Christopher | (425) 344-2107 | | Snohomish |
| B7967 | Kimball, Austin | (360) 508-2250 | | Thurston |
| B2869 | Kimball, Scott | (360) 736-2683 | | Thurston |
| B3491 | King, Ron | (425) 334-5689 | | Snohomish |
| B7789 | King, Nathan | (509) 999-4292 | Kingbn@me.com | Spokane |
| B7861 | Kinswa, Anthony | (360) 520-4900 | tntkinswa@hotmail.com | Lewis |
| B3658 | Kirner, Eugene | (366) 966-2526 | | Whatcom |
| B6670 | Klempel, Reuel | (509) 531-7901 | karesolutionsllc@gmail.com | Douglas |
| B1208 | Koch, Karl | (206) 762-3311 | | King |
| B7956 | Kokotek, Jakub | (360) 857-9621 | hotkokocustoms@gmail.com | Clark |
| B5483 | Koppang, Marc | (208) 704-1168 | | Spokane |
| B7988 | Kortekaas, Jeff | (425) 248-1083 | jkortekaas@live.com | Snohomish |
| B5058 | Krantz, Joshua | (253) 651-9341 | | Pierce |
| B6184 | Kroeger, Theresa | (206) 786-6823 | | King |
| B6074 | Kuca, Dave | (425) 830-3749 | aplusbackflowtesting.com | King |
| B7946 | Laiblin, Eric | (253) 737-7131 | elaiblin@hotmail.com | Pierce |
| B6024 | Lambert, Lee | (360) 216-9094 | laceybackflow@comcast.net | Thurston |
| B3723 | Lancaster, Jeffery | (360) 772-3396 | | Clark |
| B5878 | Lantau, Duane | (360) 262-9580 | | Lewis |
| B5565 | Laufasa, John | (206) 949-5970 | John.Laufasa@seattle.gov | King |
| B6215 | Lawson, Nathan | (360) 791-7627 | | Thurston |
| B5429 | Lechner, Donald | (509) 520-8790 | | Walla Walla |
| B5949 | Leonard, Terry | (253) 250-1295 | | Pierce |
| B6687 | Leonard, Jeffrey | (253) 250-2807 | jeff@aabackflows.com | Pierce |
| B5221 | Lessard, Daniel | (509) 662-4794 | | Chelan |
| B5380 | Lichten, Donald | (360) 477-9275 | dcbackflowservice@olypen.com | Clallam |
| B7253 | Logen, Erik | (509) 648-3615 | logenfamily@gmail.com | Whitman |
| B7254 | Logen, Vicki | (509) 336-4855 | | Whitman |
| B5010 | Long, Daniel | (360) 599-0775 | dnllong@gmail.com | Whatcom |
| B8059 | Lowe, Kyle | (253) 293-2806 | kylelowe97@gmail.com | King |
| B7393 | MacDonald, Daniel | (425) 905-5279 | danzobackflow@outlook.com | King |
| B0480 | Main, Robert | (360) 671-1557 | | Whatcom |
| B6118 | Makeeff, Tyler | (509) 380-2086 | | Benton |
| B4670 | Martin, Nathan | (206) 255-2736 | natemnortech@gmail.com | King |
| B7635 | Martin, Patjun | (503) 737-8423 | Patjun.m@lovettservices.com | Clark |
| B4568 | Mathewson, Scott | (360) 518-1397 | | Clark |
| B4485 | Mauzay, Arron | (509) 818-6901 | | Spokane |
| B4475 | Mayfield, William | (360) 951-6130 | office@backflopros.com | Thurston |
| B6997 | Mazurkiewicz, Noah | (425) 277-2888 | office@backflowsnorthwest.com | King |
| B6588 | McCamey, Timothy | (509) 630-0456 | | Chelan |
| B7754 | McClellan, Scott | (206) 786-2203 | scott_d_mcclellan@hotmail.com | Pierce |
| B7565 | McCoy, Blaine | (360) 630-0971 | mccoyb@pyebarkerfire.com | Skagit |
| B2395 | McDaniel, Brian | (509) 679-3264 | | Douglas |
| B7655 | McKay, Lucas | (360) 708-8018 | lucas@pacificstylelandscapes.com | Skagit |
| B2995 | McKay, Grant | (425) 864-2300 | office@aquasense.bz | King |
| B6282 | McKernan, Shawn | (360) 970-5721 | | Thurston |
| B5961 | McKinney, Zachary | (425) 239-6681 | | Skagit |
| B4253 | McLaughlin, Dominic | (206) 890-8337 | | King |
| B7857 | McMillen, Emilie | (425) 427-8889 | info@certified-backflowtesting.com | Pierce |
| B4743 | McWiggins, Julia | (509) 860-2553 | | Chelan |
| B7531 | Meade, Nathan | (509) 607-8891 | nmeade@spokanecity.org | Spokane |
| B5368 | Melville, David | (509) 366-3921 | | Benton |
| B4695 | Menetto, John | (509) 998-5651 | | Spokane |
| B6097 | Mercado, Scott | (206) 707-3533 | | King |
| B5438 | Mihulka, Jeff | (360) 405-0399 | | Kitsap |
| B7462 | Milan, JoseLuis | (503) 496-6040 | milanjose0@gmail.com | Clark |
| B6763 | Miller, Corrigan | (206) 375-9634 | | King |
| B4818 | Miller, Jr., Larry | (425) 228-3204 | dispatch@plumbingjoint.com | King |
| B3781 | Mock, Steve | (253) 373-0377 | | King |
| B4536 | Moe, Jason | (206) 228-1618 | batmantesting@hotmail.com | Snohomish |
| B4634 | Morris, Stuart | (206) 628-5073 | | King |
| B6361 | Munn, Jesse | (360) 631-0443 | munnwaterworks@gmail.com | Snohomish |
| B3646 | Nadeau, Jeffrey | (206) 783-4315 | | King |
| B7708 | Nelson, Justin | (509) 540-5122 | Wallawallabackflowtesting@gmail.com | Walla Walla |
| B6374 | Nickel, Mitchell | (206) 575-1962 | | King |
| B7619 | No, Sean | (425) 427-8889 | info@certified-backflowtesting.com | Snohomish |
| B5369 | Nylund, Blake | (509) 432-5887 | | Whitman |
| B5934 | O'Brien, Kevin | (509) 783-9773 | | Benton |
| B3361 | Olivas, Gabriel | (425) 687-6368 | gabriel@phoenixlandmaint.com | King |
| B7892 | Olson, Travis | (360) 865-2643 | atobackflow@gmail.com | Kitsap |
| B1573 | Orefice, John | (360) 256-0706 | john@landscapemgmt.com | Clark |
| B5664 | Osborne, Bennett | (509) 833-5003 | | Yakima |
| B7145 | Oscarson, Ryan | (509) 979-5423 | | Spokane |
| B7103 | Osorio, Jacob | (509) 947-6286 | | Benton |
| B7154 | Osorio-Sawka, Kaiulani | (808) 690-4025 | kaiulanienterprises@gmail.com | King |
| B5124 | Ottow, Jordan | (425) 231-6360 | | Snohomish |
| B7322 | Passey, Kendall | (509) 975-0847 | kendall@precisionplumbingandsupply.com | Benton |
| B6355 | Paulson, Jay | (509) 869-2011 | Backflow@fridayplumbing.com | Spokane |
| B5903 | Pearsall-Loeffler, James | (208) 771-3103 | | Spokane |
| B5801 | Peebles, Jerry | (360) 989-7589 | | Clark |
| B2463 | Perry, Nancy | (253) 840-2501 | | Pierce |
| B7769 | Petersen, Richard | (206) 240-9935 | ricky.p@comcast.net | King |
| B6524 | Petersen, Keith | (509) 940-7746 | backflowtc@gmail.com | Franklin |
| B5228 | Petersen, Robert | (503) 488-0773 | | Clark |
| B2187 | Petrie, James | (208) 746-1548 | | Asotin |
| B4966 | Piche, Brian | (509) 539-1703 | | Benton |
| B4477 | Popich, Joshua | (425) 672-9242 | | Snohomish |
| B4509 | Powell, Richard | (360) 479-7661 | | Kitsap |
| B5679 | Pyke, Eugene | (509) 386-5919 | | Walla Walla |
| B7834 | Ramirez, Ayden | (503) 438-9322 | aydenjram@gmail.com | Cowlitz |
| B7077 | Ratcliff, Bob | (541) 490-0727 | | Walla Walla |
| B5128 | Rhoads, Eric | (509) 834-9248 | | Yakima |
| B5935 | Richardson, Travis | (509) 888-2935 | | Chelan |
| B4779 | Riehl, Kelly | (206) 391-0007 | | Pierce |
| B7820 | Riggin, Ray | (509) 342-1515 | homerunboss@hotmail.com | Spokane |
| B6050 | Roberts, James | (360) 878-2076 | | Lewis |
| B5188 | Robinson, Craig | (253) 370-5137 | | Pierce |
| B7929 | Robinson, Brooke | (253) 386-6395 | brooke@midlandfireandbackflow.com | Pierce |
| B6214 | Rock, Kyle | (253) 431-3751 | | Pierce |
| B5159 | Roe, William | (509) 484-0225 | | Spokane |
| B5049 | Roe, Robert | (509) 538-2643 | | Skamania |
| B7395 | Romano, Brett | (360) 808-6287 | info@peninsulawatersolutions.com | Clallam |
| B6965 | Romero, Lorenzo | (253) 217-5782 | lorenzoromero82@gmail.com | King |
| B5304 | Romulo, Mariano | (206) 255-2971 | | King |
| B5258 | Roorda, Clint | (360) 366-9900 | | Whatcom |
| B5614 | Rosas-Sandoval, Rocio | (253) 405-1759 | mr.irrigation@comcast.net | Pierce |
| B7315 | Russell, Sean | (253) 861-9845 | summitbackflow1@gmail.com | Pierce |
| B6626 | Salter, Solomon | (206) 551-5174 | | King |
| B5596 | Salter, James | (206) 551-5174 | | King |
| B6920 | Sams, Ted | (509) 520-5963 | wwso.175@gmail.com | Whitman |
| B6904 | Sanders, Christopher | (360) 298-0717 | | San Juan |
| B8088 | Sanders, Evan | (253) 389-5272 | Bassman95.3s@gmail.com | Thurston |
| B7775 | Sandoval, Ross | (860) 910-8205 | sandovalross@ymail.com | Kitsap |
| B6216 | Santamaria, Mario | (425) 409-8403 | | Snohomish |
| B5496 | Saulibio, Leslie | (206) 353-3616 | | King |
| B6952 | Sawka, Gary | (206) 261-2166 | | King |
| B5737 | Saxon, James | (206) 551-5242 | flowsix@outlook.com | King |
| B7743 | Scaroni, Christopher | (509) 295-3658 | cscaroni@outlook.com | Benton |
| B6839 | Schafer, Robert | (509) 941-0171 | rnmservices@gmail.com | Yakima |
| B3822 | Schnee, Darin | (206) 718-8378 | dandcschnee@msn.com | Snohomish |
| B5036 | Seil, Mark | (425) 829-6034 | mtile34@comcast.net | King |
| B3217 | Sessions, James | (360) 636-0070 | | Cowlitz |
| B6840 | Sharpe, Paul | (509) 312-5107 | | Chelan |
| B6467 | Shaw, Jennifer | (253) 946-5999 | jenny@patsplumbing.com | King |
| B3685 | Sheldon, Dave | (425) 672-9242 | | Snohomish |
| B6715 | Sheppard, Josh | | | |
| B6418 | Showers, Gregory | (360) 908-7514 | greg@backflowassemblysolutions.com | Kitsap |
| B5285 | Shriver, Lindsey | (509) 378-8049 | | Franklin |
| B2226 | Sigmen, Roger | (360) 848-9093 | | Skagit |
| B7172 | Singh, Satnam | (360) 677-2020 | satnam4u@gmail.com | Thurston |
| B8138 | Singh, Sarbjit | (253) 495-1941 | mgarneet@netscape.net | Pierce |
| B7568 | Slocum, Trevor | (509) 953-8192 | tsloc217@yahoo.com | Spokane |
| B7977 | Smith, Bryan | (509) 995-1797 | bryansmith29@msn.com | Spokane |
| B6917 | Smith, Edward | (253) 878-6194 | ecs160raft@comcast.net | Pierce |
| B6679 | Smith, Wednesday | (206) 948-0484 | | King |
| B5549 | Smith, Jeffrey | (509) 981-8683 | | Spokane |
| B6027 | Snell, Daniel | (425) 780-3114 | dsnell561@gmail.com | King |
| B5189 | Solis, Esmelin | (253) 905-5192 | | Pierce |
| B7450 | Sons, Christopher | (360) 480-4138 | aimless721@hotmail.com | Thurston |
| B8063 | Sovrebov, Alan | (425) 277-2888 | Office@backflowsnorthwest.com | Snohomish |
| B5692 | Spiry, James | (206) 510-6558 | | King |
| B7141 | Stacy, Earl | (509) 797-3680 | ryguy1983@live.com | Grant |
| B8047 | Stavenau, Spencer | (503) 305-7304 | Spencer@pdxfirepro.com | Clark |
| B6729 | Stern, Greg | (509) 607-0477 | | Kittitas |
| B5306 | Stinson, Robert | (253) 273-7649 | | Pierce |
| B7972 | Styles, Breanna | (253) 255-5467 | Brspuyallup@gmail.com | Pierce |
| B5225 | Sutton, Christopher | (425) 277-2888 | office@backflowsnorthwest.com | Kitsap |
| B3508 | Szabo, Jeremy | (360) 507-8077 | | Clallam |
| B4691 | Taitano, Mark | (360) 661-4147 | | Island |
| B4759 | Tayne, Tim | (253) 212-5433 | tim@clearwaterutility.com | Thurston |
| B5084 | Thompson, Brian | (253) 200-7059 | | Pierce |
| B7282 | Torrey, Andrew | (509) 540-2990 | andrewsirrigationrepair@gmail.com | Walla Walla |
| B7397 | Tuvera, Dominador | (206) 765-7496 | domtuvera@icloud.com | King |
| B5065 | Tyhuis, Richard | (360) 675-7027 | | Island |
| B7884 | Van Cott, Steven | (509) 981-9929 | steven.vancott1@gmail.com | Spokane |
| B3074 | Van Wingerden, John | (509) 837-5593 | | Yakima |
| B3400 | Vandecoevering, Douglas | (866) 924-3473 | | Clark |
| B6796 | Vangstad, Bryan | (206) 707-1775 | abt.backflow@gmail.com | Pierce |
| B5177 | Vangstad, Jonathan | (425) 652-9970 | | King |
| B6125 | VanQuaethem, Josh | (425) 516-3580 | josh@5starbackflow.com | King |
| B3496 | Varner, Earl | (360) 265-0157 | ajbackflowtesting@hotmail.com | Kitsap |
| B7554 | Varner, Kris | (360) 900-7088 | AJ2BackflowTesting@Gmail.com | Kitsap |
| B5108 | Vilensky, Pavel | (206) 491-4617 | | Snohomish |
| B7186 | Volmer, Joshua | (509) 392-9144 | acbackflow@outlook.com | Benton |
| B1450 | Wagoner, Rick | (509) 924-8881 | fsplumbing@msn.com | Spokane |
| B7649 | Wagoner, Robert | (509) 924-8881 | rob.wagoner.jp@gmail.com | Spokane |
| B5864 | Wahlman, Gerard | (425) 870-8775 | | Snohomish |
| B6058 | Wahlman, Kristen | (425) 334-3350 | | Snohomish |
| B3973 | Walker, Kristen | (425) 275-1808 | | Snohomish |
| B6017 | Wallace, Jason | (971) 563-1589 | | Clark |
| B5636 | Walle, Jonathan | (253) 922-7075 | | Pierce |
| B7998 | Walters, Kyle | (509) 607-5056 | tuffslawnservice@gmail.com | Kittitas |
| B2238 | Warnken, Doug | (360) 580-7116 | bonniwarnken01@msn.com | Grays Harbor |
| B3769 | Weisz, Paul | (509) 973-3155 | | Benton |
| B5739 | Weisz, Kerry | (509) 973-3155 | weisacrs@embarq.com | Benton |
| B1339 | Wells, Kevin | (206) 622-6545 | | Pierce |
| B7990 | Wheeler, Charles | (360) 286-6882 | CWHEELER2202@GMAIL.COM | Kitsap |
| B7329 | White, Austen | (509) 714-0055 | inlandbackflow@gmail.com | Spokane |
| B7106 | Wickham, Dustin | (509) 999-5829 | dw_landscape@yahoo.com | Spokane |
| B6144 | Williams, Jason | (509) 885-6920 | | Chelan |
| B4510 | Williams, Jesse | (253) 435-4942 | | Pierce |
| B4977 | Williams, Michael | (253) 345-9658 | mikesbackflowservice@gmail.com | Pierce |
| B3788 | Willis, Edward | (206) 730-8935 | | Pierce |
| B1295 | Wilson, William | (509) 884-6717 | | Grant |
| B6295 | Wilson, Michael | (360) 772-1802 | | Clark |
| B8104 | Wilson, Christopher | (253) 736-3977 | wilsoca21@gmail.com | King |
| B7502 | Wise, Jeremy | (253) 262-8847 | jeremy@316backflow.com | Pierce |
| B4643 | Woollett, Danny | (360) 491-2510 | | Thurston |
| B5374 | Wright, Bradley | (509) 539-3314 | | Benton |
| B2716 | Wright, Derek | (360) 944-7121 | | Clark |
| B4798 | Yates, Garrett | (800) 841-7689 | | Clark |
| B4174 | Younce, Mike | (360) 892-8779 | | Clark |
| B5067 | Zahnow, Sheila | (425) 870-9792 | aaabackflow.wa@gmail.com | Snohomish |
| B7600 | Zenishek, Ryan | (509) 218-3808 | zenishekr@yahoo.com | N/A |
| B7712 | Zimmerman, John | (425) 577-3440 | zim1232@gmail.com | Snohomish |