The Reading School District said the man worked for a construction contractor at Reading elementary school and had passed clearances.
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The Reading Police Department said 34-year-old Jeremy Kreiser contacted an undercover police social media account on Monday.
Investigators said he engaged in an inappropriate conversation with a police officer posing as a 13-year-old girl.
Police said on Tuesday he attempted to lure the 13-year-old into meeting him outside the elementary school.
Police arrested Kreiser when they said he took physical steps towards meeting the girl.
Police said the school district was immediately informed of the situation.
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"The safety and security of our students is our top priority. We thank the Reading Police Department for their proactive investigation to keep our children safe from online predators," the Reading School District said in a statement.
The school district said students were largely unaware of the incident. Authorities said there was no risk of harm to any students or staff, according to the district.
The Reading School District explained its policy requires contractors to submit clearances for all employees and subcontractors prior to beginning work on a district project.
"The district confirmed this long-standing process was followed, and there was nothing included in the individual's clearances that would have prevented them from working with the construction firm on a RSD project," the district said.
Kreiser is being charged with attempted unlawful contact of a minor and attempted indecent assault.