40% of homes in Washington County have high radon levels. Washington county is located in Western Pennsylvania, about 22 miles outside of Pittsburgh. Washington county is home to over 200 thousand people within 81 thousand households. Founded in 1781, Washington county is full of history. Washington county is home to 4 colleges and universities, along with 14 different school districts. Homes in Washington county are in danger of radon gas as 40% of homes are above the recommended EPA radon action level of 4.0 pCi/L. According to radon.com, the average radon level in Washington County is 5.9 pCi/L. Chart below is data from radon.com.