Noise Levels in San Andreas, CA | Find Quiet Neighborhoods With Our Sound Map

46 dBA
Average noise across San Andreas
Quiet office
191
Residents above the EPA 55 dBA threshold
6% of San Andreas residents
70 dBA
Loudest residential point
Highway traffic 50 ft away

This map shows modeled outdoor noise across San Andreas 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
San Andreas, CA Map of Noise Levels in San Andreas
Click the map to explore
35 45 55 70 90
Quietest (dBA) Loudest
Colorblind friendly off

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 191 San Andreas residents, or 5.9%, live above that level. By land area, 10.1% of San Andreas is above 55 dBA.

See how noise in San Andreas compares to similar-sized cities.

Noise by Part of San Andreas

Average noise levels for San Andreas residents, grouped by direction from the center of San Andreas. Central San Andreas carries the highest population-weighted average; Northern San Andreas carries the lowest. Just 2% of residents in Northern San Andreas live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Central San Andreas.

Central San Andreas

56.9 dBA · Moderate-loud
Normal conversation an arm’s length away

14% of people above 55 dBA

QuietLoud

Eastern San Andreas

43.7 dBA · Quiet
Quiet suburban street at night

2% of people above 55 dBA

QuietLoud

Northern San Andreas

41.2 dBA · Quiet
Quiet suburban street at night

2% of people above 55 dBA

QuietLoud

Southern San Andreas

43.2 dBA · Quiet
Quiet suburban street at night

3% of people above 55 dBA

QuietLoud

Western San Andreas

49.7 dBA · Mostly quiet
Quiet office

9% of people above 55 dBA

QuietLoud

Central San Andreas sounds about 197% louder than Northern San Andreas to the human ear, a 15.7 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 do you need to be?

produces an estimated 70 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
70 dBA
Highway traffic 50 ft away
165 ft
58 dBA
Normal conversation an arm’s length away
330 ft
51 dBA
Quiet office
660 ft
44 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 11% of San Andreas sits under tree canopy (lighter than most cities) and roughly 12% 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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How Noise Is Distributed Across San Andreas

The bar chart below shows the share of San Andreas residents in each noise band. About 90% 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 San Andreas Compares

San Andreas sits at the quieter end of the spectrum. Below: how San Andreas's average outdoor noise and share of residents above the EPA threshold compare with Angels, Murphys, Arnold, and Columbia.

Average noise level (dBA)

San Andreas's 46.5 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 Andreas because most of either area is rural land away from major roads.

Share of residents above 55 dBA

About 5.9% of San Andreas 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, 10.1% of San Andreas'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 Andreas

  • 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 11% of San Andreas is under tree cover (lighter than most 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.

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.

Federal datasets used:

FHWA Highway Performance Monitoring System: road geometry, traffic counts, lane configuration
U.S. DoT Bureau of Transportation Statistics National Transportation Noise Map: aviation and rail noise, road calibration ground truth
USGS / MRLC National Land Cover Database: land cover and impervious surface coverage
USDA Forest Service Tree Canopy Cover: vegetation density for sound propagation
U.S. Census Bureau TIGER/Line: block-level geography and population
U.S. EPA Levels Document: 55 dBA outdoor reference level

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.

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