Watering your Christmas Tree Reduces Fire Hazard
Every year in the U.S., fire departments respond to an estimated 210 home fires involving Christmas trees[1]. Even though Christmas tree fires are infrequent, when they occur, they can be dangerous and costly. These fires cause an annual average of 6 civilian deaths, 16 civilian injuries, and $16.2 million in property damage[1]. The good news is that by keeping your Christmas tree watered, you can enjoy the holidays with a beautiful and safer Christmas tree.

https://www.nist.gov/el/fire-research-division-73300/national-fire-research-laboratory-73306/holiday-fire-safety