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 DayDecember 31, 2021*
Martin Luther King, Jr. DayJanuary 17
President's DayFebruary 21
Memorial DayMay 30
Independence DayJuly 4
Labor DaySeptember 5
Columbus DayOctober 10
Veteran's DayNovember 11
Thanksgiving DayNovember 24
Day after ThanksgivingNovember 25
Christmas DayDecember 26*
*Observed Date