Pennsylvania One Call System is open 24 hours a day, 365 days a year. This includes all state holidays. The following are the state holidays that will not be included in the calculation of the three business days notice.
| Pennsylvania State Holidays | 2022 |
| New Years Day | December 31, 2021* |
| Martin Luther King, Jr. Day | January 17 |
| President's Day | February 21 |
| Memorial Day | May 30 |
| Independence Day | July 4 |
| Labor Day | September 5 |
| Columbus Day | October 10 |
| Veteran's Day | November 11 |
| Thanksgiving Day | November 24 |
| Day after Thanksgiving | November 25 |
| Christmas Day | December 26* |
| *Observed Date | |