Noise Levels in Twain, CA | Find Quiet Neighborhoods With Our Sound Map
54 dBA
Average noise across Twain
Quiet office to normal conversation
14
Residents above the EPA 55 dBA threshold
19% of Twain residents
94 dBA
Loudest residential point
Power saw
This map shows modeled outdoor noise across Twain 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 14 Twain residents, or 19.0%, live above that level. By land area, 34.7% of Twain is above 55 dBA.
Average noise levels for Twain residents, grouped by direction from the center of Twain. Central Twain carries the highest population-weighted average; Eastern Twain carries the lowest. Just 10% of residents in Eastern Twain live in blocks above the EPA's 55 dBA threshold, a third of the share in Central Twain.
Central Twain
61.1 dBA · Loud
Busy restaurant
33% of people above 55 dBA
QuietLoud
Eastern Twain
47.9 dBA · Mostly quiet
Quiet office
10% of people above 55 dBA
QuietLoud
Western Twain
53.7 dBA · Moderate-loud
Quiet office to normal conversation
17% of people above 55 dBA
QuietLoud
Central Twain sounds about 150% louder than Eastern Twain to the human ear, a 13.2 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 94 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 office to normal conversation.
At source
94 dBA
Power saw
165 ft
80 dBA
City bus interior
330 ft
72 dBA
City bus interior
660 ft
64 dBA
Busy restaurant
¼ mile
56 dBA
Quiet office to normal conversation
½ mile
48 dBA
Quiet office
Calculated from the model's calibrated attenuation formula. About 29% of Twain sits under tree canopy (about average for cities) and roughly 10% 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 Twain. 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 Twain
The bar chart below shows the share of Twain residents in each noise band. About 70% of residents live below the EPA's 55 dBA threshold, and roughly 21% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Twain Compares
Twain sits the highest among the peer group. Below: how Twain's average outdoor noise and share of residents above the EPA threshold compare with Keddie, Indian Falls, Belden, and Spanish Ranch.
Average noise level (dBA)
Twain's 54.2 dBA pop-weighted average is the highest among the peer group. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than Twain because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 19.0% of Twain residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's more than any of its peer group. Measured by land area instead, 34.7% of Twain'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 Twain
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 29% of Twain is under tree cover (about average for cities), and the dominant land cover is shrub / scrub. 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.
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.
