This symbol indicates that the resource provides data only for Pennsylvania.
If there is no symbol, the resource provides data for all US states including Pennsylvania.
Pipeline & Hazardous Materials Safety Administration is an agency within the US Department of Transportation (US DOT). The agency "is the federal safety authority for ensuring the safe, reliable, and environmentally sound operations of our nation's pipeline transportation system."
The following reports come from this agency and includes reports on pipelines throughout the country as well as serious/significant incidents.
The following reports are extremely granular, meaning that these investigate facilities, dumps, parks, etc. to determine if there is a health risk.