Idaho: State guide

Idaho DEQ runs a statewide Service Line Inventories portal where residents can look up public water systems and where systems submit inventories.

Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.

Official resources in Idaho

State portal to search Idaho public water systems and access service line inventory information.

Explains who must submit inventories, the required Idaho template, and the inventory deadline.

Lists DEQ grants and low-interest loan programs for eligible public water systems, including a Drinking Water Lead Service Line LOI form.

DEQ public lead information page with links to drinking water lead resources and the inventory portal.

All Idaho community and non-transient non-community water systems must submit a lead service line inventory under the LCRR.
Initial Idaho service line inventories were required by October 16, 2024.
Idaho requires systems to use DEQ’s official service line inventory template.
DEQ’s funding page lists a FY27 Drinking Water Lead Service Line LOI form for eligible public water systems.
The DEQ inventory portal lets users search by public water system number or name.

Search your water system in the DEQ inventory portal and save the record for your address or utility.
Ask your water provider whether your customer-owned service line material is known and whether any local replacement program exists.
If your line is unknown, use the DEQ lead and inventory pages to ask your utility what identification method they accept.

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