The ultraviolet (UV) water purifier system is capable of treating small to medium size water treatment projects for residential needs both whole house (point of entry) or under the sink (point of use) applications. UV water purification and disinfection works by delivering concentrated amounts of ultraviolet light energy from germicidal ultraviolet lamp to the reproductive mechanism of a microbe there-by killing it without the use of heat or chemicals. This water purification system is useable for Home, Boat, Laboratory, Camping, Airplane, Recreational Vehicles and other applications where drinking water filtration is needed.