Noise Levels in Chatham, MA | Find Quiet Neighborhoods With Our Sound Map

53 dBA
Average noise across Chatham
Quiet office to normal conversation
715
Residents above the EPA 55 dBA threshold
30% of Chatham residents
66 dBA
Loudest residential point
Highway traffic 50 ft away

This map shows modeled outdoor noise across Chatham 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
Chatham, MA Map of Noise Levels in Chatham
Click the map to explore
35 45 55 EPA 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 715 Chatham residents, or 30.3%, live above that level. By land area, 29.2% of Chatham is above 55 dBA.

See how noise in Chatham compares to similar-sized cities.

Noise by Part of Chatham

Average noise levels for Chatham residents, grouped by direction from the center of Chatham. Central Chatham carries the highest population-weighted average; Southern Chatham carries the lowest. Just 13% of residents in Southern Chatham live in blocks above the EPA's 55 dBA threshold, about half the share in Central Chatham.

Central Chatham

55.7 dBA · Moderate-loud
Quiet office to normal conversation

33% of people above 55 dBA

QuietLoud

Eastern Chatham

54.9 dBA · Moderate-loud
Quiet office to normal conversation

39% of people above 55 dBA

QuietLoud

Northern Chatham

51.6 dBA · Moderate
Quiet office to normal conversation

25% of people above 55 dBA

QuietLoud

Southern Chatham

49.7 dBA · Mostly quiet
Quiet office

13% of people above 55 dBA

QuietLoud

Western Chatham

52.9 dBA · Moderate
Quiet office to normal conversation

29% of people above 55 dBA

QuietLoud

Central Chatham sounds about 52% louder than Southern Chatham to the human ear, a 6.0 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 66 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
66 dBA
Highway traffic 50 ft away
165 ft
54 dBA
Quiet office to normal conversation
330 ft
47 dBA
Quiet office
660 ft
40 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall

Calculated from the model's calibrated attenuation formula. About 48% of Chatham sits under tree canopy (heavier 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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How Noise Is Distributed Across Chatham

The bar chart below shows the share of Chatham residents in each noise band. About 64% of residents live below the EPA's 55 dBA threshold, and roughly 4% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.

How Chatham Compares

Chatham sits at the quieter end of the spectrum. Below: how Chatham's average outdoor noise and share of residents above the EPA threshold compare with North Eastham, Harwich, East Dennis, and West Dennis.

Average noise level (dBA)

Chatham's 53.1 dBA pop-weighted average is at the quieter end of the spectrum. Massachusetts as a whole averages 54.3 dBA and the U.S. averages 52.0 dBA. Both are lower than Chatham because most of either area is rural land away from major roads.

Share of residents above 55 dBA

About 30.3% of Chatham 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, 29.2% of Chatham's footprint sits above 55 dBA, against a Massachusetts average of 40.0% and a national average of 28.1%.

What This Means if You're Moving to Chatham

  • 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 48% of Chatham is under tree cover (heavier than most cities), and the dominant land cover is low-intensity developed land. 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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