OHA Drinking Water Services

Certified Backflow Assembly Testers

Oregon Drinking Water Services (DWS) provides a public list of OHA-certified Backflow Assembly Testers. The list is voluntary and not all certified testers choose to be on the list. Select the county you want, and then you can sort by certification #, name of tester, employer, city, and state. If you are a certified specialist trying to verify a test report but don't see the tester on the list, email the DWS Cross Connection Program at cross.connection@state.or.us.

Only OHA-certified Testers are allowed to provide testing services in Oregon. Backflow Assembly Testers who provide their testing services for a fee are required to be licensed through the Construction Contractors Board (CCB) or the Landscape Contractors Board (LCB). Testers on the following list have provided information to DWS that they, or the company they work for, have either a CCB or LCB license; however, this information has not been verified. To verify licensing, you can look up CCB licenses or LCB licenses.


Certification Number Tester Name Phone Number Employer Address City State ZIP Code Numeric Cert SortName
010853 Michael P. Hansen 503-956-4742 Backflow Professionals 395 Beverly Ln Gladstone OR 97024 10853 Hansen, Michael P.
066108 Jordan T. Ashland 503-981-6131 Ashland Brothers Landscape 2153 Molalla Rd Woodburn OR 97071 66108 Ashland, Jordan T.
1128 Steven Ackerman 503-698-2211 19139 Windmill Dr Oregon City OR 97045 1128 Ackerman, Steven
180104 William A. Harrold 971-206-1795 16593 Lewis Cemetery Rd SE Silverton OR 97381 180104 Harrold, William A.
2879 David G. Schafer 503-682-3343 Landscape Enterprises Inc PO Box 436 Wilsonville OR 97070 2879 Schafer, David G.
3466 Tim A. Aufenthie 503-318-6313 T&R Building Services 8660 Rogue Lane Wilsonville OR 97070 3466 Aufenthie, Tim A.
3719 Martin L. Montgomery 503-894-4382 Montgomery's Backflow Testing PO Box 1122 Sandy OR 97055 3719 Montgomery, Martin L.
3823 Mark D. Anderson 503-849-4700 16397 Front Ave Oregon City OR 97045 3823 Anderson, Mark D.
3941 Joshua Fender 503-207-1900 Seimens Industry Inc 15201 NW Greenbrier Parkway, St A-4 Beaverton OR 97006 3941 Fender, Joshua
4004 Michael A. Warford 503-406-8572 PO Box 1894 Oregon City OR 97045 4004 Warford, Michael A.
4019 Michael J. Younce 503-289-1745 AMERICAN BACKFLOW SERVICES 5623 SE Center St Portland OR 97206 4019 Younce, Michael J.
4060 Sarbjit S. Dhah 503-658-1828 Sunrise Landscape Professionals LLC PO Box 665 Boring OR 97009 4060 Dhah, Sarbjit S.
4063 Robert S. Petersen 503-488-0773 North West Plumbing & Backflow Inc. 12042 SE Sunnyside Rd PMB476 Clackamas OR 97015 4063 Petersen, Robert S.
4068 Bill Stillwell 503-622-4759 PO Box 1029 Sandy OR 97055 4068 Stillwell, Bill
4096 Jeremy Tower 503-806-4734 PO Box 1981 Sandy OR 97055 4096 Tower, Jeremy
4101 Paul Molisani 503-830-0171 PM Backflow PO Box 981 Wilsonville OR 97070 4101 Molisani, Paul
4117 Eugene G. Mason 503-631-3947 MP PLUMBING Po Box 393 Clackamas OR 97015 4117 Mason, Eugene G.
4212 Earl S. Shook 503-777-7777 Dennis 7 Dee's Landscaping 7355 SE Johnson Creek Blvd Portland OR 97206-9329 4212 Shook, Earl S.
4316 Matthew Schafer 503-682-3343 Landscape Enterprises Inc PO Box 436 Wilsonville OR 97070 4316 Schafer, Matthew
4408 Jens-Uwe Klabunde 503-603-9988 WATER METRICS WEST 16120 SW 72nd Ave Tigard OR 97224 4408 Klabunde, Jens-Uwe
445823 Nathan J. Bernert 503-432-7905 Bernert Landscaping 1660 S Elm St Canby OR 97013 445823 Bernert, Nathan J.
4486 Kyle Harms 503-289-1745 AMERICAN BACKFLOW SERVICES 5623 SE Center St Portland OR 97206 4486 Harms, Kyle
4487 Mark Robinson 503-475-9080 Farr Better Backflow Testing LLC PO Box 389 Boring OR 97009 4487 Robinson, Mark
4491 Sabino Martinez 503-631-3516 Sierra Landscaping Maintenance LLC 17681 S Springwater Rd Oregon City OR 97045 4491 Martinez, Sabino
4588 Larry P. Smith 503-951-3094 34321 S. Barlow Rd Woodburn OR 97071 4588 Smith, Larry P.
5119 Kevin Krajewski 971-983-9456 Dynamic Backflow PO Box 610 Wilsonville OR 97070 5119 Krajewski, Kevin
5249 Tyson L. Charriere 503-655-9161 MP PLUMBING CO PO Box 393 Clackamas OR 97015 5249 Charriere, Tyson L.
5414 Phillip T. Merrill 503-734-7400 14603 S Macksburg Rd Molalla OR 97038 5414 Merrill, Phillip T.
5560 Luis A. Huertas 503-309-9372 NW Maintenance & Electrical Services 29085 SW San Remo Ave Wilsonville OR 97070 5560 Huertas, Luis A.
5632 Nicholas E. Hartley 360-693-9906 Fire Systems West PO Box 352 Sandy OR 97055 5632 Hartley, Nicholas E.
5643 Robert Offinga 971-246-3443 Crown Fire Systems 7402 SE Johnson Creek Blvd Portland OR 97206 5643 Offinga, Robert
565267 Herbert S. Carson 503-875-4701 Cascade Mechanical Systems PO Box 399 Estacada OR 97023 565267 Carson, Herbert S.
5724 Michael S. Gallagher 503-235-6141 10801 SW Canterbury Lane #101 Tigard OR 97224 5724 Gallagher, Michael S.
5725 Austin P. Gallagher 503-236-6141 10801 SW Canterbury Lane #101 Tigard OR 97224 5725 Gallagher, Austin P.
572968 Trevor R. Hill 360-726-9642 A-Absolute Comfort 15886 S Park Pl Ct Oregon City OR 97045 572968 Hill, Trevor R.
5791 Agustin Feliciano-Madrid 971-207-5401 Flawless Remodeling Services, LLC PO Box 1845 Wilsonville OR 97070 5791 Feliciano-Madrid, Agustin
6130 Brent T. Barker 503-894-0563 Centurion Fire Protection PO Box 1705 Oregon City OR 97045 6130 Barker, Brent T.
6134 Sorin Oancea 503-734-4510 WESTERN STATES FIRE PROTECTION 13896 Fir St Suite B Oregon City OR 97045 6134 Oancea, Sorin
6185 James E. Hambelton 541-398-0149 Eastern Oregon Landscaping LLC 23561 E Lolo Pass Rd Rhododendron OR 97049 6185 Hambelton, James E.
6294 Monty L. Graham 503-347-1107 M&E Backflow Consulting 1517 NE 10th Pl Canby OR 97013 6294 Graham, Monty L.
6307 Brent T. Beck 503-341-3980 Becks Botanical, Inc PO Box 638 Wilsonville OR 97070 6307 Beck, Brent T.
634671 Daniel A. Dorosh 503-757-2164 Earth Born Landscape Services PO Box 722 Clackamas OR 97015 634671 Dorosh, Daniel A.
6416 Eric R. Nealeigh 503-319-6396 AMERICAN BACKFLOW SERVICES 5623 SE Center St Portland OR 97206 6416 Nealeigh, Eric R.
6450 Edgar I. Martinez 503-317-4681 T&R Building Services 31040 SW Salmon Ln Wilsonville OR 97070 6450 Martinez, Edgar I.
6622 Benjamin K. Enebo 844-623-8378 Bens Backflow, LLC 21641 SE Happiness Hill Ln Eagle Creek OR 97022 6622 Enebo, Benjamin K.
6630 Jeff S. Ellis 971-246-0384 Trademark Landscapes, Inc PO Box 2410 Oregon City OR 97045 6630 Ellis, Jeff S.
6673 Timothy P. Heffelbower 360-903-7255 PROGRASS INC 28985 SW Kinsman Rd Wilsonville OR 97070 6673 Heffelbower, Timothy P.
720508 Ralph R. Cortez 503-220-0394 HMS Commercial Service, Inc 4103 SE International Way, Ste 303 Milwaukie OR 97222 720508 Cortez, Ralph R.
759253 Matthew J. Zinzer 503-406-8233 Full Sun Landscape Management, LLC 1381 NE 14th Pl Canby OR 97013 759253 Zinzer, Matthew J.
90 Richard Scott 503-703-7821 Clearwater Backflow Testing Services PO Box 90953 Portland OR 97290 90 Scott, Richard
996 Peter L. MacMahon 503-557-8450 Petes Quality Plumbing Inc 20985 S Sweetbriar Rd West Linn OR 97068 996 MacMahon, Peter L.