3,129 of the 3,460 lots in Dupont (90%) 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 57 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
38 of the 3,460 lots in Dupont (1%) have septic records on file with the Tacoma-Pierce County Health Department. 3,400 lots are inside a Pierce County sewer service area, and 3,341 are within 300 feet of a sewer main on the county's sewer map.
Of the 3,460 lots in Dupont, 85 touch a mapped landslide hazard area, 30 an erosion hazard area, 78 a flood area and 96 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 November 8, 2026.
How these numbers are worked out · Guides