Public Drinking Water Systems

According to the Oregon Administrative Rules, a Public Water System is defined as "A system for the provision to the public of piped water for human consumption, if such system has more than three service connections, or supplies water to a public or commercial establishment that operates a total of at least 60 days per year, and that is used by 10 or more individuals per day. Public water system also means a system for the provision to the public of water through constructed conveyances other than pipes to at least 15 service connections or regularly serves at least 25 individuals daily at least 60 days of the year."

Types of Water Systems that are Regulated by the County

• Community Water System – “Means a public water system that has 15 or more service connections used by year-round residents, or that regularly serves 25 or more year-round residents up to a population of 3,300.”
• Transient Non-Community Water System – "Means a public water system that serves a transient population of 25 or more persons.”
• Non-Transient Non-Community Water System –"Means a public water system that is not a community water system and that regularly serves at least 25 of the same persons over 6 months per year.”
• State Regulated Water System – “Means a public water system which serves 4 to 14 service connections or serves 10 to 24 people. Monitoring requirements for these systems are the same as those for Transient Non-Community water systems.”

Resources and Forms

• Drinking Water Resources on OHA page
• Joint Water Commission
• Public Water Systems Oregon Administrative Rules (OAR)
• Tualatin Valley Water District
• Contact Us