Public Water Supply

PWS Continuity of Operations during COVID-19 Threat

With the threat of the Novel Coronavirus/COVID-19, DEQ is aware of the challenges Public Water Supply Systems face.  We will be providing information to PWS systems concerning various aspects of their operation during this time in the links below.

Information for Public Water Supply Operators

Corrosion Control Awareness Letter

The Safe Drinking Water Act defines a Public Water Supply (PWS) as a system that provides water via piping or other constructed conveyances to the public for human consumption.

DEQ’s Public Water Supply program currently oversees more than 1,300 active PWS systems. These PWS systems serve approximately 3.7 million customers.

Public water supplies are classified according to the number and type of persons served. Of the PWS systems DEQ oversees, 67% are classified as community water systems (such as towns and rural water districts), 27% are classified as non-community water systems (such as rest stops or parks), and 6% are classified as non-transient, non-community water systems (such as schools or factories).

There are also much smaller systems, which are referred to as non-public or minor water systems. These systems are regulated by the Environmental Complaints and Local Services (ECLS) Division of DEQ.

Listed below are the five (5) areas of DEQ’s PWS program:


Routine monitoring is necessary to determine if drinking water is safe.


Technical assistance and regulatory enforcement are critical components of keeping drinking water safe.


Affordable funding solutions and oversight of drinking water infrastructure projects are key to providing safe drinking water.


Determining if a PWS system is viable and sustainable is important in maintaining safe drinking water.


Ongoing inspections of PWS systems are fundamental in keeping drinking water safe.