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Water System Classifications

Administered by the Utah Division of Drinking Water


Community Water System

A Community Water System (CWS) is a public water system which serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents.

Non-Transient Non-Community Water System

A Non-Transient Non-Community Water System (NTNCWS) is a public water system that regularly serves at least 25 of the same nonresident persons per day for more than six months per year. Examples of such systems are those serving the same individuals (industrial workers, school children, church members) by means of a separate system.

Public Water System

A Public Water System (PWS) is a system, either publicly or privately owned, providing water through constructed conveyances for human consumption and other domestic uses, which has at least 15 service connections or serves an average of at least 25 individuals daily at least 60 days out of the year and includes collection, treatment, storage, or distribution facilities under the control of the operator and used primarily in connection with the system, or collection, pretreatment, or storage facilities used primarily in connection with the system but not under the operator's control (see 19-4-102 of the Utah Code Annotated). All public water systems are further categorized into three different types:

  • Community (CWS)
  • Non-transient Non-community (NTNCWS)
  • Transient Non-community (TNCWS)

These categories are important with respect to required monitoring and water quality testing found in R309-205 and R309-210 (see also the definition of a water system).

Transient Non-Community Water System

A Transient Non-Community Water System (TNCWS) is a non-community public water system that does not serve 25 of the same nonresident persons per day for more than six months per year. Examples of such systems are RV parks, diners, or convenience stores where the permanent nonresident staff number less than 25, but the number of people served exceeds 25.

Water System

A Water System is all lands, property, rights, rights-of-way, easements, and related facilities owned by a single entity, which are deemed necessary or convenient to deliver drinking water from a source to the service connection of a consumers. This includes all water rights acquired in connection with the system, all means of conserving, controlling, and distributing drinking water, including, but not limited to, diversion or collection works, springs, wells, treatment plants, pumps, lift stations, service meters, mains, hydrants, reservoirs, tanks, and associated appurtenances within the property or easement boundaries under the control of or controlled by the entity owning the system.