According to the CDC, in 2014, there were 49 confirmed cases of lead poisoning in Montco out of 7421 people tested.
Corroding household plumbing is a cause of elevated lead levels locally. Running the water for 30 seconds to two minutes if the water has been sitting for a few hours can lower your lead exposure.
Under the federal Safe Drinking Water Act, your water company sends you an annual water quality report. Have you read yours?
This article from Vox has more information about lead reporting nationwide.