Noise Levels in Federal Hill Historic District, Bristol, CT | Find Quiet Neighborhoods With Our Sound Map
54 dBA
Average noise across Federal Hill Historic District
Quiet office to normal conversation
2,891
Residents above the EPA 55 dBA threshold
34% of Federal Hill Historic District residents
71 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across Federal Hill Historic District 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 2,891 Federal Hill Historic District residents, or 33.9%, live above that level. By land area, 38.5% of Federal Hill Historic District is above 55 dBA.
61.5% below 55 dBA
38.5% above 55 dBA
See how noise in Federal Hill Historic District compares to similar-sized neighborhoods.
Noise by Part of Federal Hill Historic District
Average noise levels for Federal Hill Historic District residents, grouped by direction from the center of Federal Hill Historic District. The highest population-weighted average is in southern Federal Hill Historic District; the lowest is in northeastern Federal Hill Historic District, where just 22% of residents live in blocks above the EPA's 55 dBA threshold, about two-thirds of the share in the loudest section.
Southern Federal Hill Historic District
56.4 dBA · Moderate-loud
Normal conversation an arm’s length away
Southeastern Federal Hill Historic District
55.8 dBA · Moderate-loud
Quiet office to normal conversation
Southwestern Federal Hill Historic District
55.2 dBA · Moderate-loud
Quiet office to normal conversation
Northern Federal Hill Historic District
54.0 dBA · Moderate-loud
Quiet office to normal conversation
Northeastern Federal Hill Historic District
53.2 dBA · Moderate-loud
Quiet office to normal conversation
To the human ear, noise in southern Federal Hill Historic District sounds about 25% louder than in northeastern Federal Hill Historic District, a 3.2 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 71 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
71 dBA
City bus interior
165 ft
57 dBA
Normal conversation an arm’s length away
330 ft
49 dBA
Quiet office
660 ft
41 dBA
Quiet suburban street at night
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 38% of Federal Hill Historic District sits under tree canopy (much heavier than most neighborhoods) and roughly 40% 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 Federal Hill Historic District. 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 Federal Hill Historic District
The bar chart below shows the share of Federal Hill Historic District residents in each noise band. About 67% of residents live below the EPA's 55 dBA threshold, and roughly 6% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Federal Hill Historic District Compares
Federal Hill Historic District sits at the quieter end of the spectrum. Below: how Federal Hill Historic District's average outdoor noise and share of residents above the EPA threshold compare with City Hall Monument District, Downtown New Britain, Behind The Rocks, and West End.
Average noise level (dBA)
Federal Hill Historic District's 53.5 dBA pop-weighted average is at the quieter end of the spectrum. Connecticut as a whole averages 51.3 dBA and the U.S. averages 52.0 dBA. Both are lower than Federal Hill Historic District because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 33.9% of Federal Hill Historic District 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, 38.5% of Federal Hill Historic District's footprint sits above 55 dBA, against a Connecticut average of 27.3% and a national average of 28.1%.
What This Means if You're Moving to Federal Hill Historic District
- 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 38% of Federal Hill Historic District is under tree cover (much heavier than most neighborhoods), and the dominant land cover is medium-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.
