Noise Levels in Grand Mound, WA | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across Grand Mound
Quiet office
20
Residents above the EPA 55 dBA threshold
6% of Grand Mound residents
82 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across Grand Mound 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 20 Grand Mound residents, or 5.7%, live above that level. By land area, 29.7% of Grand Mound is above 55 dBA.
Average noise levels for Grand Mound residents, grouped by direction from the center of Grand Mound. Southern Grand Mound carries the highest population-weighted average; Western Grand Mound carries the lowest. Just 3% of residents in Western Grand Mound live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Grand Mound.
Eastern Grand Mound
46.3 dBA · Mostly quiet
Quiet office
1% of people above 55 dBA
QuietLoud
Southern Grand Mound
60.2 dBA · Loud
Normal conversation an arm’s length away
27% of people above 55 dBA
QuietLoud
Western Grand Mound
43.1 dBA · Quiet
Quiet suburban street at night
3% of people above 55 dBA
QuietLoud
Southern Grand Mound sounds about 227% louder than Western Grand Mound to the human ear, a 17.1 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 US Hwy 12 do you need to be?
US Hwy 12 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
Highway traffic 50 ft away
165 ft
57 dBA
Normal conversation an arm’s length away
330 ft
49 dBA
Quiet office
660 ft
41 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 65% of Grand Mound sits under tree canopy (much heavier than most cities) and roughly 2% 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.
-->
Rail Noise
Active freight rail runs through parts of Grand Mound. 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 Grand Mound
The bar chart below shows the share of Grand Mound residents in each noise band. About 88% of residents live below the EPA's 55 dBA threshold, and roughly 13% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Grand Mound Compares
Grand Mound sits the highest among the peer group. Below: how Grand Mound's average outdoor noise and share of residents above the EPA threshold compare with Galvin, Vail, Doty, and Klaber.
Average noise level (dBA)
Grand Mound's 48.0 dBA pop-weighted average is the highest among the peer group. Washington as a whole averages 51.3 dBA and the U.S. averages 52.0 dBA. Both are lower than Grand Mound because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 5.7% of Grand Mound 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, 29.7% of Grand Mound's footprint sits above 55 dBA, against a Washington average of 27.7% and a national average of 28.1%.
What This Means if You're Moving to Grand Mound
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 US Hwy 12 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 65% of Grand Mound is under tree cover (much heavier 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.
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.
