Washington County Multi-Jurisdictional Natural Hazard Mitigation Plan

Washington County is a suburban county located on the west side of the Portland, Oregon metropolitan region. Its boundaries extend from the City of Portland to the Oregon coast range. The current population is approximately 617,713 and is growing. It has a mix of urban, suburban, and rural areas. The eastern half of the County is comprised of service industries, light manufacturing, residential, and commercial activity. It is relatively densely populated. The western half is primarily agricultural and private forest lands across rural settings, together with several smaller incorporated and unincorporated communities. The County seat of government is in Hillsboro, Oregon. The County has experienced substantial growth over the last fifty years principally in the electronics and high-tech industries. Fifty-seven percent of the state's population growth in the past five years has occurred in Washington County. Washington County is one of the most diverse counties in Oregon with Hispanic or Latino of any race (19%) and Asian (12%) being the largest non-white groups. Ten percent (10%) of the population has a disability, seventeen (17%) percent are born outside of the United States, and twenty-five (25%) precent speak languages other than English. The current multi-jurisdictional NHMP include the following partners: Current NHMP Plan Holders (2023 Washington County NHMP) Cities City 2025 Population (Estimate) Washington County 617,713 (Incorporated & Unincorporated) Hillsboro 111,150 Tigard 57,867 Beaverton 98,488 Forest Grove 27,323 Cornelius 16,008 Sherwood 20,438 North Plains 3,419 Special Districts Special District Service Clean Water Services Surface and wastewater collection and treatment agency for urban residents of Washington County. Tualatin Valley Water District Water provider for approximately 215,500 accounts in and around Washington County. Tualatin Hills Park & Recreation District Provides park and recreation facilities, programs, services, and natural areas that meet the needs of the diverse communities it serves throughout Washington County. Cornelius Fire District Fire/EMS provider serving the rural areas surrounding the City of Cornelius. Forest Grove Fire District Fire/EMS provider serving the rural areas surrounding the City of Forest Grove. These jurisdictions have committed to participate in the plan update, for a total of 11 planning participants. For this project, the City of Cornelius, Cornelius Fire District, City of Forest Grove, and Forest Grove Fire District will each need to have separate annexes developed. In the current plan, the two fire districts participated jointly with the cities. Additionally, the two cities and four special districts listed below have committed to participate in this project, as new planning partners: New Jurisdictions Cities City 2025 Population (Estimate) Banks 1,829 Tualatin 28,074 Special Districts Banks Fire District Fire/EMS provider serving the City of Banks and the Banks Rural Fire Protection District. Raleigh Hills Water District A domestic water supply district covering approximately two square miles of unincorporated Washington County in the Raleigh Hills area serving about 4,500 accounts. Tualatin Valley Irrigation District Operates Scoggins Dam and maintains pumps and piping to provide irrigation for agriculture in western Washington County. West Slope Water District Located in Washington County, west of Portland. The service area is about 3.5 square miles and provides water to 10,300 accounts.