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EPA Guideline & Muncipal Best Practice
EPA Guideline & Muncipal Best Practice
The EPA’s longstanding guidance states that 55 dB(A) outside is the threshold “preventing activity interference and annoyance”. In its 1974 report, EPA explicitly identifies “55 decibels outdoors” as a target to avoid disrupting speech or sleep. (Indoor residential is 45 dB(A) by comparison.) Thus 55 dB(A) is widely accepted as an upper bound for acceptable continuous ambient noise in “outdoor areas where human activity takes place”
Several jurisdictions have recently proposed using ~55 dB(A) as a data-center limit. For example, Prince William County (VA) adopted a data-center noise ordinance where the limit is 55 dB(A) at the property line (nighttime standard). (This matches the EPA guidance and is far lower than Texas’s statewide limit of 85 dB.) Similarly, California’s San Joaquin Valley and energy facility siting guidelines reference 55 dB(A) as the goal at nearby residences. The Environment Texas report (Sept 2024) notes that noise above 55 dB can have health impacts, underscoring why 55 is a prudent standard.
Current Texas Baseline
Current Texas Baseline
By contrast, Texas law currently deems noise above 85 dB unreasonable (a very high bar). Advocates urge local governments to adopt 55 dB(A) in new ordinances. So the claim that 55 dB(A) is a now-common “industry standard” is supported by multiple recent proposals and the EPA benchmark (even if no binding Texas law yet).
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