3,235 of the 3,459 lots in Dupont (94%) 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 56 lots are outside the urban growth area, where Pierce County's own ADU rules decide.
38 of the 3,459 lots in Dupont (1%) have septic records on file with the Tacoma-Pierce County Health Department. 3,457 lots are inside a Pierce County sewer service area, and 3,291 are within 300 feet of a county sewer main.
Of the 3,459 lots in Dupont, 84 touch a mapped landslide hazard area, 29 an erosion hazard area, 77 a flood area and 95 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