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 2*
Martin Luther King, Jr. DayJanuary 16
President's DayFebruary 20
Memorial DayMay 29
Juneteenth National Independence DayJune 19
Independence DayJuly 4
Labor DaySeptember 4
Columbus Day/Indigenous Peoples DayOctober 9
Veteran's DayNovember 10*
Thanksgiving DayNovember 23
Day after ThanksgivingNovember 24
Christmas DayDecember 25
*Observed Date