2,580 of the 3,028 lots in Steilacoom (85%) are zoned for houses inside an urban growth area. On those lots, Washington's HB 1337 requires the city or county to allow at least two accessory dwelling units (ADUs). Another 277 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
50 of the 3,028 lots in Steilacoom (2%) have septic records on file with the Tacoma-Pierce County Health Department. 280 lots are inside a Pierce County sewer service area, and 2,670 are within 300 feet of a county sewer main.
Vacant land in Steilacoom sold for a median of $270,769 per acre across 18 sales since October 1, 2023. Homes sold for a median of $625,000 across 256 sales. 3 new homes were permitted on its unincorporated lots since October 1, 2021. The city issues its own permits, which are not in our data yet.
Of the 3,028 lots in Steilacoom, 335 touch a mapped landslide hazard area, 146 an erosion hazard area, 95 a flood area and 118 an inventoried wetland, on Pierce County's maps.
From the Pierce County Assessor-Treasurer, the county's zoning, sewer, hazard and growth-area maps, and the Tacoma-Pierce County Health Department. Records as of October 2, 2026.
How these numbers are worked out · Guides