| Metro West Point | Seattle | 68.71 |
| King County South WWTP | Renton | 58.7 |
| Yakima Regional Wastewater Facility | Yakima | 9.97 |
| Post Point Plant | Bellingham | 8.85 |
| Richland City Wastewater Lab | Richland | 6.1 |
| Three Rivers Regional WWTP | Longview | 4.69 |
| Lakota WWTP | Federal Way | 4.51 |
| Ellensburg WWTP | Ellensburg | 3.77 |
| Walla Walla Water Reclamation Facility | Walla Walla | 3.55 |
| Wenatchee Wastewater Treatment Plant | Wenatchee | 3.11 |
| Lynnwood City Wastewater Treatment Plan | Edmonds | 3.05 |
| Miller Creek WWTP And Compost Facility | Seattle | 2.6 |
| Picnic Point Wastewater Treatment Facility | Edmonds | 2.19 |
| Salmon Creek WWTP | Seattle | 2.05 |
| Port Orchard WWTP | Port Orchard | 1.7 |
| Port Of Sunnyside Industrial WWTF | Sunnyside | 1.57 |
| Lynden STP | Lynden | 1.55 |
| Port Angeles WWTP | Port Angeles | 1.35 |
| Ferndale STP | Ferndale | 1.32 |
| Sunnyside STP | Sunnyside | 1.31 |
| Othello STP | Othello | 1.18 |
| Chelan WWTP | Chelan | 1.15 |
| Grandview Wastewater Treatment Plant | Grandview | 1.05 |
| Burlington WWTP | Burlington | 1.04 |
| Enumclaw STP | Enumclaw | 0.94 |
| Prosser City WWTP | Prosser | 0.91 |
| Port Townsend WWTP | Port Townsend | 0.75 |
| Washougal STP | Washougal | 0.74 |
| Sedro Woolley City Of | Sedro-Woolley | 0.7 |
| Clarkston WWTP | Clarkston | 0.69 |
| Birch Bay Water And Sewer District WWTP | Blaine | 0.68 |
| Toppenish Wastewater Treatment Plant | Toppenish | 0.66 |
| Cle Elum WWTP | Cle Elum | 0.61 |
| North Bend STP | North Bend | 0.58 |
| Colville WWTP | Colville | 0.58 |
| Omak Wastewater Treatment Plant | Omak | 0.56 |
| Orting STP | Orting | 0.55 |
| Bainbridge Island WWTP | Bainbridge Island | 0.49 |
| Stanwood STP | Stanwood | 0.48 |
| Cashmere STP Facility | Cashmere | 0.37 |
| Chewelah WWTP | Chewelah | 0.36 |
| Sultan WWTP | Sultan | 0.35 |
| Leavenworth STP | Leavenworth | 0.33 |
| Granite Falls STP | Granite Falls | 0.31 |
| La Center STP Aspen Ave | La Center | 0.29 |
| La Conner STP | Mount Vernon | 0.26 |
| Everson WWTP | Everson | 0.23 |
| Long Beach STP | Long Beach | 0.23 |
| Kittitas POTW | Kittitas | 0.22 |
| Benton City STP | Benton City | 0.21 |
| Colfax Wastewater Treatment Plant | Colfax | 0.21 |
| Zillah Wastewater Treatment Plant | Zillah | 0.21 |
| Dayton STP | Dayton | 0.21 |
| Bingen POTW | Bingen | 0.21 |
| Davenport WWTP | Davenport | 0.2 |
| Friday Harbor STP | Friday Harbor | 0.2 |
| Oroville Wastewater Treatment Plant | Oroville | 0.19 |
| Winlock Wastewater Treatment Plant | Winlock | 0.18 |
| Yakama Legends Casino Hotel | Toppenish | 0.18 |
| Grand Coulee WWTP | Grand Coulee | 0.18 |
| Manchester WWTP | Port Orchard | 0.18 |
| Granger POTW | Granger | 0.18 |
| Grand Mound STP | Rochester | 0.17 |
| Brewster STP | Brewster | 0.17 |
| Newport WWTP | Newport | 0.17 |
| Tulalip Wastewater Treatment Plant | Marysville | 0.16 |
| Mabton Wastewater Treatment Plant | Mabton | 0.16 |
| Suquamish WWTP | Suquamish | 0.16 |
| Cathlamet Former Sewage Lagoons | Cathlamet | 0.16 |
| Okanogan WWTP | Okanogan | 0.16 |
| Eatonville STP | Eatonville | 0.15 |
| Coulee Dam WWTP | Coulee Dam | 0.15 |
| Kitsap Cnty Kingston WWTP | Kingston | 0.14 |
| Snoqualmie WWTP | Snoqualmie | 0.14 |
| Bridgeport WWTP | Bridgeport | 0.13 |
| Pe Ell STP | Pe Ell | 0.12 |
| Naches STP | Naches | 0.12 |
| Big Lake WWTP | Mount Vernon | 0.11 |
| Entiat POTW | Entiat | 0.1 |
| Castle Rock STP | Castle Rock | 0.1 |
| Tonasket POTW | Tonasket | 0.09 |
| Pomeroy Sewage Treatment Plant | Pomeroy | 0.09 |
| Concrete STP | Concrete | 0.08 |
| Buena WWTF | Zillah | 0.08 |
| Waitsburg STP | Waitsburg | 0.08 |
| Lummi Kwina Road WWTP | Bellingham | 0.08 |
| Asotin STP | Clarkston | 0.07 |
| Twisp WWTP | Twisp | 0.07 |
| St John WWTP | Saint John | 0.07 |
| Rock Island WWTP | Rock Island | 0.06 |
| Clallam Bay Correction Center STP | Clallam Bay | 0.06 |
| North Bonneville STP | North Bonneville | 0.06 |
| Tekoa STP | Tekoa | 0.06 |
| Toutle STP | Toutle | 0.06 |
| Winthrop Wastewater Treatment Plant | Winthrop | 0.05 |
| Wilbur STP | Wilbur | 0.05 |
| Palouse Wastewater Treatment Plant | Palouse | 0.04 |
| Odessa STP | Odessa | 0.04 |
| Crescent Bar Inc | Quincy | 0.04 |
| Reardan Town STP | Reardan | 0.04 |
| Toledo STP | Toledo | 0.04 |
| Hartstene Pointe STP | Shelton | 0.03 |
| Peshastin Wastewater Treatment Plant | Peshastin | 0.03 |
| Harrah WWTP | Harrah | 0.03 |
| Endicott STP | Endicott | 0.03 |
| Lyle POTW | Lyle | 0.03 |
| Sekiu STP | Sekiu | 0.02 |
| Carbonado STP | Carbonado | 0.02 |
| Clallam Bay STP | Clallam Bay | 0.02 |
| Fisherman Bay STP | Lopez Island | 0.02 |
| Klickitat Pud WWTF | Lyle | 0.02 |
| Metaline STP | Metaline | 0.02 |
| Moclips River Estates WWTP | Moclips | 0.02 |
| Wishram Wastewater Treatment Plant | Wishram | 0.01 |
| Vantage STP | Ellensburg | 0.01 |
| Tamoshan WWTP | Olympia | 0.01 |
| Lewis County Water And Sewer District 6 STP | Mossyrock | 0.01 |
| Spangle STP | Spangle | 0.01 |
| Stevens Pass STP | Leavenworth | 0.01 |
| Eastsound Orcas Village WWTP | Orcas | 0.01 |
| Diablo Large Onsite Sewage System | Marblemount | 0.01 |
| Fairfield WWTP | Fairfield | 0.01 |
| Larrabee State Park | Bellingham | 0 |
| Fort Flagler State Park | Nordland | 0 |
| Selkirk Schools And WWTP | Metaline Falls | 0 |
| Rockford WWTP | Rockford | 0 |
| Rustlewood STP | Shelton | 0 |
| Chambers Creek WWTP | University Place | — |
| Colton STP | Colton | — |
| Ione STP | Ione | — |
| Lake Wenatchee WWTP | Leavenworth | — |
| Oakesdale STP | Oakesdale | — |
| Rosalia STP | Rosalia | — |
| Ryderwood STP | Ryderwood | — |
| Salmon Creek WWTP | Vancouver | — |
| Vancouver Westside STP | Vancouver | — |
| Wa Dnr Larch Mountain Corr | Yacolt | — |
