Washington State Parks' own park finder lists 59 state parks with a Trailer Dump. We opened every one of those 59 park pages on 2026-10-31. 57 post the same fee: $5 per use ("Trailer Dump Fee"). Bogachiel and Dash Point list a trailer dump but don't post a dump fee, so we don't guess one. Beebe Bridge's page says the dump is free for overnight campers and $5 for everyone else; the other pages don't say whether campers pay. The park pages also list Discover Pass prices; check the park's fees section before you pull in.
Late fall matters here. Several parks close for winter or turn off campground water, and a few say the dump station itself closes. We quote what each park page says and nothing more. Call the park before a long detour; the number is in each row.
| Park | Hours, fee and notes from the park page | Source |
|---|---|---|
| Alta Lake State Park 1B Otto Road , Pateros , WA 98846 (509) 923-2473 | Hours: Summer: 6:30 a.m. - 10:00 p.m. Winter: Park closed Nov. 1 - March 30 Dump fee: $5 per use Hours section: park closed Nov 1 to Mar 30. | Washington State Parks Park page verified 2026-10-31 |
| Battle Ground Lake State Park 18002 NE 249th Street, Battle Ground, WA 98604 (360) 687-4621 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Bay View State Park 10901 Bayview Edison Road, Mount Vernon, WA 98273 (360) 757-0227 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Beebe Bridge State Park 23459 SR97, Orondo, WA 98843 not posted | Hours: Dawn - Dusk year round Dump fee: $5 per use Park page: free for overnight campers; non-overnight visitors pay $5. Station is across from the Front Booth Welcome Station. | Washington State Parks Park page verified 2026-10-31 |
| Belfair State Park 3151 NE SR 300 , Belfair, WA 98528 (360) 275-0668 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Birch Bay State Park 5105 Helweg Road, Blaine, WA 98230 (360) 371-2800 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Bogachiel State Park 185983 Highway 101, Forks, WA 98331 (360) 374-6356 | Hours: 8:00 a.m. - Dusk year round Dump fee: not posted | Washington State Parks Park page verified 2026-10-31 |
| Bridgeport State Park 235A Half Sun Way, Bridgeport , WA 98813 (509) 686-7231 | Hours: 6:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Brooks Memorial State Park 2465 Highway 97, Goldendale, WA 98620 (509) 773-4611 | Hours: Summer: 8:00 a.m. - Dusk Winter: Closed November 1 - April 15 Dump fee: $5 per use Hours section: closed Nov 1 to Apr 15. | Washington State Parks Park page verified 2026-10-31 |
| Camano Island State Park 2269 S Lowell Point Road, Camano Island, WA 98282 (360) 387-3031 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Cape Disappointment State Park 244 Robert Gray Drive, Ilwaco, WA 98624 (360) 642-3078 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Columbia Hills Historical State Park 8514 Lewis and Clark Highway, Lyle, WA 98617 not posted | Hours: Summer: 6:30 a.m. - Dusk Winter: 6:30 a.m. - Dusk (Horsethief Lake Closed November -March) Dump fee: $5 per use Hours section: Horsethief Lake closed November to March. | Washington State Parks Park page verified 2026-10-31 |
| Conconully State Park 119 Broadway Street, Conconully, WA 98819 (509) 826-7408 | Hours: Summer: 6:30 a.m. - Dusk Winter: Closed Nov. 1 - Mar. 31 (weather dependent) Dump fee: $5 per use Alert: water off since 10/28/2026; winter water at the dump station until the park closes 1 p.m. 10/31/2026. Hours: closed Nov 1 to Mar 31. | Washington State Parks Park page verified 2026-10-31 |
| Curlew Lake State Park 62 State Park Road, Republic, WA 99166 (509) 775-3592 | Hours: Summer: 6:30 a.m. - Dusk Winter: Closed Nov. 1 - April 6 Dump fee: $5 per use Alert: water off since 10/27/2026; winter water at the dump station until the park closes 1 p.m. 10/31/2026. Hours: closed Nov 1 to Apr 6. | Washington State Parks Park page verified 2026-10-31 |
| Daroga State Park 1 S Daroga Park Lane, Orondo, WA 98843 (509) 784-0229 | Hours: Summer: 6:30 a.m. - Dusk Winter: Closed from Oct. 1 - April 1st Dump fee: $5 per use Hours section: closed Oct 1 to Apr 1. | Washington State Parks Park page verified 2026-10-31 |
| Dash Point State Park 5700 SW Dash Point Road, Federal Way, WA 98023 (253) 661-4955 | Hours: 8:00 a.m. - Dusk year round Dump fee: not posted | Washington State Parks Park page verified 2026-10-31 |
| Deception Pass State Park 41229 State Route 20, Oak Harbor, WA 98277 (360) 675-3767 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Dosewallips State Park 306996 Highway 101, Brinnon, WA 98320 (360) 796-4415 | Hours: Summer: 8:00 am. - 10:00 p.m. Winter: 8:00 a.m. - 5:00 p.m. Dump fee: $5 per use Park page: winter water supply near the dump station. | Washington State Parks Park page verified 2026-10-31 |
| Fields Spring State Park 992 Park Road, Anatone, WA 99401 (509) 256-3332 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Fort Flagler Historical State Park 10541 Flagler Road, Nordland, WA 98358 (360) 385-1259 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Fort Townsend Historical State Park 1370 Old Fort Townsend Road, Port Townsend, WA 98368 (360) 385-3595 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Fort Worden Historical State Park 202 Eisenhower Ave, Port Townsend, WA 98368 (360) 344-4412 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Grayland Beach State Park 925 Cranberry Beach Rd, Grayland, WA 98547 (360) 267-4301 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Park page: no chemical additives in holding tanks (septic system). | Washington State Parks Park page verified 2026-10-31 |
| Ike Kinswa State Park 873 State Route 122, Silver Creek, WA 98585 (360) 983-3402 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Park page: RV dump station is open year-round. | Washington State Parks Park page verified 2026-10-31 |
| Illahee State Park 3540 NE Sylvan Way, Bremerton, WA 98310 (360) 478-6460 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Alert: campground water shut off early November through March. | Washington State Parks Park page verified 2026-10-31 |
| Kanaskat-Palmer State Park 32101 Cumberland-Kanaskat Road, Ravensdale, WA 98051 (360) 886-0148 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Lake Chelan State Park 7544 S Lakeshore Road , Chelan, WA 98816 (509) 687-3710 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Lake Easton State Park 150 Lake Easton State Park Rd, Easton, WA 98925 (509) 656-2586 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Lake Sammamish State Park 2182 NW Sammamish Road, Issaquah, WA 98027 (425) 455-7010 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Lake Sylvia State Park 1812 N. Lake Sylvia Road, Montesano, WA 98563 (360) 249-3621 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Park page: sewer dump station with fresh water. | Washington State Parks Park page verified 2026-10-31 |
| Lake Wenatchee State Park 21588 Lake Wenatchee Hwy, Leavenworth, WA 98826 (509) 763-3101 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use Park page: the trailer dump in the North Park stays open until snow is forecast, then closes for the season. | Washington State Parks Park page verified 2026-10-31 |
| Larrabee State Park 245 Chuckanut Drive, Bellingham, WA 98229 (360) 676-2093 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Lewis and Clark Trail State Park 36149 Highway 12, Dayton, WA 99328 (509) 337-6457 | Hours: Summer: 6:30 a.m. - Dusk Winter: Park closed Nov. 1 - March 31 Dump fee: $5 per use Hours section: park closed Nov 1 to Mar 31. | Washington State Parks Park page verified 2026-10-31 |
| Lincoln Rock State Park 91 Lincoln Rock Park Road, East Wenatchee, WA 98802 (509) 884-8702 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Manchester State Park 7767 E Hilldale Rd, Port Orchard, WA 98366 (360) 871-4065 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Alert: campground water shut off early November through March. | Washington State Parks Park page verified 2026-10-31 |
| Maryhill State Park 50 Highway 97, Goldendale, WA 98620 (509) 773-3145 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use Park page: in winter, water is only available at the dump station. | Washington State Parks Park page verified 2026-10-31 |
| Millersylvania State Park 12245 Tilley Road S, Olympia, WA 98512 (360) 753-1519 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Moran State Park 3572 Olga Road, Olga, WA 98279 (360) 376-2326 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Ocean City State Park 148 SR 115, Hoquiam, WA 98550 (360) 289-3553 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Park page: sewer dump station with fresh water. | Washington State Parks Park page verified 2026-10-31 |
| Pacific Beach State Park 49 Second Street, Pacific Beach, WA 98571 (360) 276-4297 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use Park page: sewer dump station with fresh water. | Washington State Parks Park page verified 2026-10-31 |
| Paradise Point State Park 33914 NW Paradise Park Road, Ridgefield, WA 98642 (360) 263-2350 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Pearrygin Lake State Park 625 Bear Creek Rd, Winthrop, WA 98862 (509) 996-2370 | Hours: Summer: 6:30 a.m. - Dusk Winter: 6:30 a.m. - Dusk Dump fee: $5 per use Alert: camping closed for the season from 10/30/2026. The page doesn't say whether the dump stays open. | Washington State Parks Park page verified 2026-10-31 |
| Penrose Point State Park 321 158th Avenue SW, Lakebay, WA 98349 (253) 884-2514 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Potholes State Park 6762 Highway 262 East, Othello, WA 99344 (509) 346-2759 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use Park page: winter water supply at the trailer dump station area. | Washington State Parks Park page verified 2026-10-31 |
| Potlatch State Park 21020 N US Highway 101, Shelton, WA 98584 (360) 877-5361 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Rasar State Park 38730 Cape Horn Road, Concrete, WA 98237 (360) 826-3942 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Riverside State Park 9711 W Charles Road, Nine Mile Falls, WA 99026 (509) 465-5064 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use Park page: the dump station closes for the winter season. | Washington State Parks Park page verified 2026-10-31 |
| Scenic Beach State Park 9596 Scenic Beach Rd NW, Seabeck, WA 98380 (360) 830-5079 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Alert: campground water shut off early November through March. | Washington State Parks Park page verified 2026-10-31 |
| Schafer State Park 1365 W Schafer Park Road, Elma, WA 98541 (360) 482-3852 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Seaquest State Park 3030 Spirit Lake Highway, Castle Rock, WA 98611 (360) 644-5235 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Sequim Bay State Park 269035 Highway 101, Sequim, WA 98382 (360) 683-4235 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| South Whidbey State Park 4128 S Smugglers Cove Road, Freeland, WA 98249 (360) 678-4519 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Spencer Spit State Park 521 A. Bakerview Road, Lopez Island, WA 98261 (360) 468-2251 | Hours: 8 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Steamboat Rock State Park 51052 Highway 155, Electric City, WA 99123 (509) 633-1304 | Hours: 6:30 a.m. - Dusk year round Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Sun Lakes-Dry Falls State Park 34875 Park Lake Road NE, Coulee City, WA 99115 (509) 632-5583 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8:00 a.m. - Dusk Dump fee: $5 per use | Washington State Parks Park page verified 2026-10-31 |
| Twenty-Five Mile Creek State Park 20530 S Lakeshore Road, Chelan, WA 98816 (509) 687-3610 | Hours: Summer: 6:30 a.m. - Dusk Winter: Closed Nov. 1 - April 1 Dump fee: $5 per use Hours section: closed Nov 1 to Apr 1. | Washington State Parks Park page verified 2026-10-31 |
| Twin Harbors State Park 3120 WA-105, Westport, WA 98595 (360) 268-9717 | Hours: 8:00 a.m. - Dusk year round Dump fee: $5 per use Park page: no chemical additives in holding tanks (septic system). | Washington State Parks Park page verified 2026-10-31 |
| Wenatchee Confluence State Park 333 Olds Station Road, Wenatchee, WA 98801 (509) 664-6373 | Hours: Summer: 6:30 a.m. - Dusk Winter: 8 a.m. - Dusk Dump fee: $5 per use Park page: buy the $5 trailer dumping permit at the park. | Washington State Parks Park page verified 2026-10-31 |
| Yakima Sportsman State Park 904 University Parkway, Yakima, WA 98901 (509) 575-2774 | Hours: Summer: 8:00 a.m. - Dusk Winter: Closes Oct.1 - April 16 Dump fee: $5 per use Hours section: closes Oct 1 to Apr 16. | Washington State Parks Park page verified 2026-10-31 |
Source: Washington State Parks park finder, Trailer Dump filter, plus each park page linked above. Checked 2026-10-31.