Noise Levels in Sonora, CA | Find Quiet Neighborhoods With Our Sound Map
49 dBA
Average noise across Sonora
Quiet office
2,498
Residents above the EPA 55 dBA threshold
14% of Sonora residents
79 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across Sonora 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 2,498 Sonora residents, or 13.5%, live above that level. By land area, 20.0% of Sonora is above 55 dBA.
80.0% below 55 dBA
20.0% above 55 dBA
See how noise in Sonora compares to similar-sized cities.
Noise by Part of Sonora
Average noise levels for Sonora residents, grouped by direction from the center of Sonora. The highest population-weighted average is in southwestern Sonora; the lowest is in northeastern Sonora, where just 4% of residents live in blocks above the EPA's 55 dBA threshold, a third of the share in the loudest section.
Southwestern Sonora
54.5 dBA · Moderate-loud
Quiet office to normal conversation
Sonora Knolls
50.9 dBA · Moderate
Quiet office
Southern Sonora
47.1 dBA · Mostly quiet
Quiet office
Southeastern Sonora
46.7 dBA · Mostly quiet
Quiet office
Northeastern Sonora
44.9 dBA · Quiet
Quiet suburban street at night
To the human ear, noise in southwestern Sonora sounds about 95% louder than in northeastern Sonora, a 9.6 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 State Rte 108 do you need to be?
State Rte 108 produces an estimated 64 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
64 dBA
Busy restaurant
165 ft
51 dBA
Quiet office
330 ft
44 dBA
Quiet suburban street at night
660 ft
36 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 26% of Sonora sits under tree canopy (about average for cities) and roughly 16% 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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Rail Noise
Active freight rail runs through parts of Sonora. For most blocks the rail-only contribution is small. Combined road-plus-rail noise rarely exceeds road noise on its own. The exceptions are the handful of blocks within roughly a quarter mile of the right-of-way during pass-through hours.
Use the Rail toggle on the map above to isolate rail's contribution from road and aviation.
How Noise Is Distributed Across Sonora
The bar chart below shows the share of Sonora residents in each noise band. About 90% of residents live below the EPA's 55 dBA threshold, and roughly 3% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Sonora Compares
Sonora sits at the quieter end of the spectrum. Below: how Sonora's average outdoor noise and share of residents above the EPA threshold compare with Oakdale, Riverbank, Jamestown, and Phoenix Lake.
Average noise level (dBA)
Sonora's 49.0 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 Sonora because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 13.5% of Sonora 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, 20.0% of Sonora'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 Sonora
- 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 State Rte 108 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 26% of Sonora is under tree cover (about average for cities), and the dominant land cover is evergreen forest. 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.
