Notes
City of Portland Bureau of Development Services informational packet for residential building permit applicants with property in the Portland International Airport (PDX) Noise Impact Overlay Zone (City of Portland Zoning Code Chapter 33.470). Covers three DNL noise contours — 68 DNL (1990 68 dBA, new residential prohibited), 65 DNL (1990 65 dBA, density limits apply), and 55 DNL (2035 55 dBA, 50th percentile forecast) — with development requirements including Acoustic Engineer’s Certification, Noise Disclosure Statement, and Noise Easement dedicated to the Port of Portland recorded with Multnomah County Assessment, Recording and Taxation. Includes PDX Noise Impact Zone contour map, permit instructions, and reimbursement eligibility information for costs associated with acoustical certification.