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 
New Years DayJanuary 1
Martin Luther King, Jr. DayJanuary 18
President's DayFebruary 15
Memorial DayMay 31
Independence DayObserved July 5
Labor DaySeptember 6
Columbus DayOctober 11
Veteran's DayNovember 11
Thanksgiving DayNovember 25
Day after ThanksgivingNovember 26
Christmas DayObserved December 24
News Years Day 2022 ObservedObserved December 31