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We do not know because property values are based on factors that can vary by location. The Washington County Assessment and Taxation Department determines each property’s assessed value. Government agencies determine the tax rate.
We do know, though, that the Oregon Constitution limits the rate of growth of property value subject to taxation. The limit is based on a property's maximum assessed value (MAV). MAV can't increase by more than 3-percent each year, unless there are changes to the property, such as the addition of a new structure, improvement of an existing structure, or subdivision or partition of the property. So if you don’t make any changes to your property, the assessed value should not go up by more than 3 percent a year.
System Development Charges are fees paid by property owners or developers in conjunction with development. The fees are to pay for the costs of existing and planned facilities that provide capacity to serve new growth. So, a water SDC could be used to pay for expansion of a large transmission pipe, or perhaps a treatment plant.
It’s not part of this project, but the City Council could review and consider modifying SDC charges in the future. As a reminder, though, the city only controls the amount of water system development charges. Other agencies, such as the Tualatin Hills Park and Recreation District (THPRD), Clean Water Services (CWS) and Washington County control some of the SDCs for things like parks, sewer, stormwater and transportation.