Westmoreland county is located in Western Pennsylvania, and was the first county in Pennsylvania that was founded to the west of the Allegheny mountains. Westmoreland county is home to over 360 thousand people within 153 thousand households. Founded in 1773, Westmoreland county is full of history. Westmoreland county is home to 7 colleges and universities, along with 18 different school districts. Homes in Westmoreland county are in danger of radon gas as 42.1% of homes are above the recommended EPA radon action level of 4.0 pCi/L. According to radon.com, the average radon level in Westmoreland County is 6.2 pCi/L. Chart below is data from radon.com.