Noise Levels in San Miguel, CA | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across San Miguel
Quiet office
1,053
Residents above the EPA 55 dBA threshold
29% of San Miguel residents
83 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across San Miguel 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 1,053 San Miguel residents, or 29.4%, live above that level. By land area, 22.4% of San Miguel is above 55 dBA.
77.6% below 55 dBA
22.4% above 55 dBA
See how noise in San Miguel compares to similar-sized cities.
Noise by Part of San Miguel
Average noise levels for San Miguel residents, grouped by direction from the center of San Miguel. The highest population-weighted average is in western San Miguel; the lowest is in eastern San Miguel, where just 1% of residents live in blocks above the EPA's 55 dBA threshold, a fifth of the share in the loudest section.
Western San Miguel
58.2 dBA · Loud
Normal conversation an arm’s length away
Northwestern San Miguel
58.0 dBA · Loud
Normal conversation an arm’s length away
Southeastern San Miguel
49.1 dBA · Mostly quiet
Quiet office
Eastern San Miguel
43.5 dBA · Quiet
Quiet suburban street at night
To the human ear, noise in western San Miguel sounds about 177% louder than in eastern San Miguel, a 14.7 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 US Hwy 101 do you need to be?
US Hwy 101 produces an estimated 73 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
73 dBA
City bus interior
165 ft
60 dBA
Normal conversation an arm’s length away
330 ft
52 dBA
Quiet office to normal conversation
660 ft
45 dBA
Quiet suburban street at night
¼ mile
37 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 0% of San Miguel sits under tree canopy (much lighter than most cities) and roughly 22% 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 San Miguel. 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 San Miguel
The bar chart below shows the share of San Miguel residents in each noise band. About 58% of residents live below the EPA's 55 dBA threshold, and roughly 2% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How San Miguel Compares
San Miguel sits at the quieter end of the spectrum. Below: how San Miguel's average outdoor noise and share of residents above the EPA threshold compare with Paso Robles, Cambria, Cayucos, and Templeton.
Average noise level (dBA)
San Miguel's 47.8 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 San Miguel because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 29.4% of San Miguel 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, 22.4% of San Miguel'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 San Miguel
- 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 US Hwy 101 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 0% of San Miguel is under tree cover (much 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.
