Noise Levels in Downtown Harbor-Post Road South, Milford, CT | Find Quiet Neighborhoods With Our Sound Map
57 dBA
Average noise across Downtown Harbor-Post Road South
Normal conversation an arm’s length away
3,487
Residents above the EPA 55 dBA threshold
47% of Downtown Harbor-Post Road South residents
82 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across Downtown Harbor-Post Road South 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 3,487 Downtown Harbor-Post Road South residents, or 46.9%, live above that level. By land area, 58.0% of Downtown Harbor-Post Road South is above 55 dBA.
Average noise levels for Downtown Harbor-Post Road South residents, grouped by direction from the center of Downtown Harbor-Post Road South. Central Downtown Harbor-Post Road South carries the highest population-weighted average; Southern Downtown Harbor-Post Road South carries the lowest. Just 25% of residents in Southern Downtown Harbor-Post Road South live in blocks above the EPA's 55 dBA threshold, about two-thirds of the share in Central Downtown Harbor-Post Road South.
Central Downtown Harbor-Post Road South
59.9 dBA · Loud
Normal conversation an arm’s length away
40% of people above 55 dBA
QuietLoud
Eastern Downtown Harbor-Post Road South
55.1 dBA · Moderate-loud
Quiet office to normal conversation
36% of people above 55 dBA
QuietLoud
Northern Downtown Harbor-Post Road South
58.9 dBA · Loud
Normal conversation an arm’s length away
66% of people above 55 dBA
QuietLoud
Southern Downtown Harbor-Post Road South
52.4 dBA · Moderate
Quiet office to normal conversation
25% of people above 55 dBA
QuietLoud
Western Downtown Harbor-Post Road South
57.4 dBA · Moderate-loud
Normal conversation an arm’s length away
58% of people above 55 dBA
QuietLoud
Central Downtown Harbor-Post Road South sounds about 68% louder than Southern Downtown Harbor-Post Road South to the human ear, a 7.5 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 Connecticut Tpke do you need to be?
Connecticut Tpke produces an estimated 78 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 suburban street at night.
At source
78 dBA
City bus interior
165 ft
64 dBA
Busy restaurant
330 ft
57 dBA
Normal conversation an arm’s length away
660 ft
49 dBA
Quiet office
¼ mile
41 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 33% of Downtown Harbor-Post Road South sits under tree canopy (much heavier than most neighborhoods) and roughly 34% 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 Downtown Harbor-Post Road South. 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.
Airport Noise
Tweed/New Haven (HVN) sits east of Downtown Harbor-Post Road South. The U.S. Department of Transportation models aviation noise around this airport from federal traffic data, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 55 dBA on the map's Overall layer. Blocks on the opposite side of Downtown Harbor-Post Road South, particularly to the west, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Downtown Harbor-Post Road South
The bar chart below shows the share of Downtown Harbor-Post Road South residents in each noise band. About 48% of residents live below the EPA's 55 dBA threshold, and roughly 22% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Downtown Harbor-Post Road South Compares
Downtown Harbor-Post Road South sits the highest among the peer group. Below: how Downtown Harbor-Post Road South's average outdoor noise and share of residents above the EPA threshold compare with Parkway-Wheelers Farm Road, Reservoir-Whiskey Hill, Westville, and Boston Avenue-Mill Hill.
Average noise level (dBA)
Downtown Harbor-Post Road South's 56.8 dBA pop-weighted average is the highest among the peer group. Connecticut as a whole averages 51.3 dBA and the U.S. averages 52.0 dBA. Both are lower than Downtown Harbor-Post Road South because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 46.9% of Downtown Harbor-Post Road South 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, 58.0% of Downtown Harbor-Post Road South'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 Downtown Harbor-Post Road South
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 Connecticut Tpke 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 33% of Downtown Harbor-Post Road South is under tree cover (much heavier than most neighborhoods), 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.
Airport noise is directional. Tweed/New Haven's approach paths concentrate aviation noise to the east. Neighborhoods to the west of downtown show no measurable contribution from the airport.
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.
