TUCSON, AZ -- Here's what we know about the four-day freeze that swept through the area earlier this month. It left plumbers booked for days. The freeze recorded the second-coldest February temperature in the annals of Tucson weather, behind a 17-degree day in 1899.

Tucson Water demand went from 76 million gallons on Wednesday to 111 million gallons on Thursday, as leaks erupted in water pipes and other facilities.

Water workers counted at least 300 instances of damage to their own facilities, from reservoirs and booster pumps, to pipes and equipment, and had to shut down service to 3,000 customers.

And it could absolutely happen again.