Noise Levels in Sleepy Hollow, CA | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across Sleepy Hollow
Quiet office
267
Residents above the EPA 55 dBA threshold
14% of Sleepy Hollow residents
60 dBA
Loudest residential point
Normal conversation an arm’s length away
This map shows modeled outdoor noise across Sleepy Hollow 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.
Overall
Road
Rail
Aviation
Click the map to explore
35 dBa55 dBa (EPA limit)90+ dBa
3545557090
Quietest (dBA)Loudest
Colorblind friendlyoff
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 267 Sleepy Hollow residents, or 13.9%, live above that level. By land area, 9.1% of Sleepy Hollow is above 55 dBA.
Average noise levels for Sleepy Hollow residents, grouped by direction from the center of Sleepy Hollow. Southern Sleepy Hollow carries the highest population-weighted average; Northern Sleepy Hollow carries the lowest. Just 4% of residents in Northern Sleepy Hollow live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Sleepy Hollow.
Eastern Sleepy Hollow
46.1 dBA · Mostly quiet
Quiet office
5% of people above 55 dBA
QuietLoud
Northern Sleepy Hollow
45.8 dBA · Mostly quiet
Quiet suburban street at night
4% of people above 55 dBA
QuietLoud
Southern Sleepy Hollow
54.6 dBA · Moderate-loud
Quiet office to normal conversation
42% of people above 55 dBA
QuietLoud
Southern Sleepy Hollow sounds about 84% louder than Northern Sleepy Hollow to the human ear, a 8.8 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 do you need to be?
produces an estimated 60 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 soft rainfall.
At source
60 dBA
Normal conversation an arm’s length away
165 ft
47 dBA
Quiet office
330 ft
39 dBA
Soft rainfall
660 ft
35 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 7% of Sleepy Hollow sits under tree canopy (lighter than most cities) and roughly 23% 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 International (SFO) sits southeast of Sleepy Hollow. The U.S. Department of Transportation measures aviation noise around this airport directly, 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 75 dBA on the map's Overall layer. Blocks on the opposite side of Sleepy Hollow, particularly to the northwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Sleepy Hollow
The bar chart below shows the share of Sleepy Hollow residents in each noise band. About 100% of residents live below the EPA's 55 dBA threshold, and roughly 0% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Sleepy Hollow Compares
Sleepy Hollow sits at the quieter end of the spectrum. Below: how Sleepy Hollow's average outdoor noise and share of residents above the EPA threshold compare with Woodacre, Belvedere-Tiburon, Belvedere, and Lakeville.
Average noise level (dBA)
Sleepy Hollow's 48.1 dBA pop-weighted average is at the quieter end of the spectrum. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than Sleepy Hollow because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 13.9% of Sleepy Hollow 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, 9.1% of Sleepy Hollow'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 Sleepy Hollow
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 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 7% of Sleepy Hollow is under tree cover (lighter than most cities), and the dominant land cover is grassland. 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 International's approach paths concentrate aviation noise to the southeast. Neighborhoods to the northwest of downtown show no measurable contribution from the airport.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.
