Generally, water fountains are very safe, provided you buy from a reputable manufacturer and can see a lot of genuine positive reviews. As a concept, water fountains just provide a gentle fresh stream of water that helps to make it more appealing to cats, and they’re often actually safer than a water bowl since they can sterilize and filter the water for your cat. Just avoid buying a cheap water fountain online that you can’t see useful manufacturer information for, as they are electrical products and you don’t want to take a risk buying something that may not have been manufactured with the safety of your kitty in mind.