Noise Levels in 91709, CA | Find Quiet Neighborhoods With Our Sound Map
53 dBA
Average noise across 91709
Quiet office to normal conversation
22,367
Residents above the EPA 55 dBA threshold
32% of 91709 residents
82 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across 91709 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 22,367 91709 residents, or 31.5%, live above that level. By land area, 34.6% of 91709 is above 55 dBA.
Average noise levels for 91709 residents, grouped by direction from the center of 91709. Eastern 91709 carries the highest population-weighted average; Southern 91709 carries the lowest. Just 17% of residents in Southern 91709 live in blocks above the EPA's 55 dBA threshold, about half the share in Eastern 91709.
Central 91709
53.2 dBA · Moderate-loud
Quiet office to normal conversation
33% of people above 55 dBA
QuietLoud
Eastern 91709
56.8 dBA · Moderate-loud
Normal conversation an arm’s length away
44% of people above 55 dBA
QuietLoud
Northern 91709
53.4 dBA · Moderate-loud
Quiet office to normal conversation
32% of people above 55 dBA
QuietLoud
Southern 91709
47.7 dBA · Mostly quiet
Quiet office
17% of people above 55 dBA
QuietLoud
Western 91709
50.4 dBA · Moderate
Quiet office
20% of people above 55 dBA
QuietLoud
Eastern 91709 sounds about 88% louder than Southern 91709 to the human ear, a 9.1 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 State Rte 71 do you need to be?
State Rte 71 produces an estimated 77 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
77 dBA
City bus interior
165 ft
64 dBA
Busy restaurant
330 ft
57 dBA
Normal conversation an arm’s length away
660 ft
50 dBA
Quiet office
¼ mile
42 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 9% of 91709 sits under tree canopy (lighter than most zip codes) 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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Airport Noise
Ontario International (ONT) sits northeast of 91709. 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 45 dBA on the map's Overall layer. Blocks on the opposite side of 91709, particularly to the southwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across 91709
The bar chart below shows the share of 91709 residents in each noise band. About 62% of residents live below the EPA's 55 dBA threshold, and roughly 14% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 91709 Compares
91709 sits the lowest among the peer group. Below: how 91709's average outdoor noise and share of residents above the EPA threshold compare with 91710, 91766, 92880, and 91762.
Average noise level (dBA)
91709's 53.2 dBA pop-weighted average is the lowest among the peer group. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than 91709 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 31.5% of 91709 residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's fewer than any of its peer group. Measured by land area instead, 34.6% of 91709'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 91709
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 State Rte 71 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 9% of 91709 is under tree cover (lighter than most zip codes), 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.
Airport noise is directional. Ontario International's approach paths concentrate aviation noise to the northeast. Neighborhoods to the southwest 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.
