Wastewater systems collect and treat water that flows from indoor uses, such as homes and businesses. Drinking water systems supply safe, reliable drinking water to homes,businesses and other structures requiring water service. This Idaho at a Glance focuses on domestic wastewater and drinking water systems and excludes industrial systems, except where specified.
In 2024, there were an estimated 450 wastewater systems in Idaho, many of which were small, each serving 3,300 users or fewer. Five large systems each served over 100,000 users. In 2025, Idaho had 2,016 drinking water systems, the vast majority of which were small, serving 3,300 or fewer users each. Three large systems each served more than 100,000 users.
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