Allegheny County has no countywide dark-sky ordinance but many municipalities require shielded fixtures in new development. Pittsburgh Zoning §915.03 mandates full cutoff lighting for commercial and multifamily.
Pittsburgh Zoning Code §915.03.B requires all outdoor lighting for commercial, institutional, and multifamily uses to be full cutoff (zero uplight) with glare shielded at property lines. Mt Lebanon, Fox Chapel, and Sewickley Heights have residential shielding requirements. Cherry Springs State Park dark-sky preservation (while located in Potter County) has influenced PA municipal adoption of International Dark-Sky Association standards. LED color temperature limits (3000K or warmer) apply in some suburban municipalities. Residential single-family lighting is largely exempt but subject to nuisance claims for offensive glare.
Commercial lighting violations: 250 to 1,000 dollars plus required modification. Residential nuisance complaints typically handled through civil action.
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See how Allegheny County's dark sky rules rules stack up against other locations.
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