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 
Christmas DayDecember 25

New Year's DayJanuary 1
Martin Luther King DayJanuary 15
Presidents' DayFebruary 19
Memorial DayMay 27
Juneteenth National Independence DayJune 19
Independence DayJuly 4
Labor DaySeptember 2
Columbus Day/Indigenous Peoples' DayOctober 14
Veterans DayNovember 11
ThanksgivingNovember 28
Day After ThanksgivingNovember 29
ChristmasDecember 25