Noise Levels in Alamo, CA | Find Quiet Neighborhoods With Our Sound Map
53 dBA
Average noise across Alamo
Quiet office to normal conversation
3,098
Residents above the EPA 55 dBA threshold
20% of Alamo residents
83 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across Alamo at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
What the numbers sound like
- 30 dBAWhisper
- 40 dBASoft rainfall
- 45 dBAQuiet suburban street at night
- 50 dBAQuiet office
- 55 dBAEPA outdoor threshold: light traffic 100 ft away
- 60 dBANormal conversation an arm's length away
- 65 dBABusy restaurant
- 70 dBAHighway traffic 50 ft away
- 80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 3,098 Alamo residents, or 20.0%, live above that level. By land area, 34.6% of Alamo is above 55 dBA.
65.4% below 55 dBA
34.6% above 55 dBA
See how noise in Alamo compares to similar-sized cities.
Noise by Part of Alamo
Average noise levels for Alamo residents, grouped by direction from the center of Alamo. The highest population-weighted average is in northwestern Alamo; the lowest is in northeastern Alamo, where just 4% of residents live in blocks above the EPA's 55 dBA threshold, a fifth of the share in the loudest section.
Northwestern Alamo
64.8 dBA · Loud
Busy restaurant
Southeastern Alamo
64.3 dBA · Loud
Busy restaurant
Central Alamo
56.1 dBA · Moderate-loud
Normal conversation an arm’s length away
Eastern Alamo
47.3 dBA · Mostly quiet
Quiet office
Northeastern Alamo
47.3 dBA · Mostly quiet
Quiet office
To the human ear, noise in northwestern Alamo sounds about 236% louder than in northeastern Alamo, a 17.5 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
How far back from I-680 do you need to be?
I-680 produces an estimated 79 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a quiet suburban street at night.
At source
79 dBA
City bus interior
165 ft
66 dBA
Busy restaurant
330 ft
58 dBA
Normal conversation an arm’s length away
660 ft
50 dBA
Quiet office
¼ mile
42 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 23% of Alamo sits under tree canopy (about average for cities) and roughly 27% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.
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Airport Noise
San Francisco Bay Oakland International (OAK) sits southwest of Alamo. The U.S. Department of Transportation models aviation noise around this airport from federal traffic data, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 65 dBA on the map's Overall layer. Blocks on the opposite side of Alamo, particularly to the northeast, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Alamo
The bar chart below shows the share of Alamo residents in each noise band. About 67% of residents live below the EPA's 55 dBA threshold, and roughly 19% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Alamo Compares
Alamo sits at the louder end of the spectrum. Below: how Alamo's average outdoor noise and share of residents above the EPA threshold compare with Moraga, Clayton, Fairview, and Cherryland.
Average noise level (dBA)
Alamo's 53.0 dBA pop-weighted average is at the louder end of the spectrum. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than Alamo because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 20.0% of Alamo residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 34.6% of Alamo's footprint sits above 55 dBA, against a California average of 36.0% and a national average of 28.1%.
What This Means if You're Moving to Alamo
- Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from I-680 and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
- Tree canopy can help reduce modeled noise exposure. Roughly 23% of Alamo is under tree cover (about average for cities), and the dominant land cover is low-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
- Airport noise is directional. San Francisco Bay Oakland International's approach paths concentrate aviation noise to the southwest. Neighborhoods to the northeast of downtown show no measurable contribution from the airport.
