327 of the 574 lots in Carbonado (57%) 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 158 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
81 of the 574 lots in Carbonado (14%) have septic records on file with the Tacoma-Pierce County Health Department. 242 lots are inside a Pierce County sewer service area, and 0 are within 300 feet of a county sewer main.
Vacant land in Carbonado sold for a median of $68,218 per acre across 8 sales since October 1, 2023. Homes sold for a median of $554,000 across 37 sales. 6 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 574 lots in Carbonado, 223 touch a mapped landslide hazard area, 49 an erosion hazard area, 57 a flood area and 4 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