Napa, CA Noise Levels
Noise levels in Napa, CA
At 47.5 dB(A), Napa, CA falls inside HUD's "Acceptable" noise zone, 65 dB(A) day-night average or below under 24 CFR 51.104, the federal government's own line for building housing with no extra sound attenuation required. The main source is road traffic, well ahead of the other two modes BTS tracks. That figure is sampled at one coordinate, the Census Bureau's own internal point for Napa, not a street-by-street survey of the whole place.
Where Napa's noise comes from
BTS models these three sources separately before combining them, so a place can be quiet on two and loud on the third.
If you're weighing a move to Napa
Upgraded windows, door seals and STC-rated glazing meaningfully cut broadband, near-continuous road noise.
How Napa compares nationally
Napa ranks 1,873 of 3,622 measured places nationally, 1 being the loudest this dataset covers. By population, it ranks 494 of the 12,137 places in this dataset, home to about 76,921 people.
Checking one address in Napa
Napa's figure above is a town-wide reading. For one exact address, BTS's own map is the free, authoritative source.
Where Napa's figures come from
Every dB(A) figure on this page traces to a named BTS dataset, documented in the methodology guide. The guide to what actually cuts each kind of noise explains why road traffic calls for a different fix than the other two sources.