Almost all tap water, is unsafe to drink in Thailand. Pattaya is no exception. The tap water is safe to shower, but don't use it for drinking. If you have a sensitive stomach, don't use it for brushing your teeth either. You can get bottled water at every 7/11 (and they are everywhere) in Pattaya. A tip from us, there are local "mom and pop shops" throughout Pattaya, real Thai convenience stores that sell bottled water much cheaper then at the 7/11 stores. At these mom and pop shops you can get 3 bottles of 1.5 litres for around 100 Baht. Here at Villa Oranje we provide you 2 complimentary bottles of water every day.