Oneida County, Idaho — public water systems
At a glance
10 active public water systems are filed under Oneida County, Idaho in EPA's SDWIS records, together reporting 2,980 people served. The largest is City of Malad, which reports serving 2,200 people. 1 is a community water system serving people where they live; the other 9 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
10
Population served
3K
Community systems
1
Groundwater share
100%
How does Oneida County compare with other Idaho counties?
Oneida County has the 40th-most active public water systems among the 64 counties listed for active Idaho systems in EPA records; among the 47 with 3 or more systems, the median has 27. Its systems report 2,980 people served in total, the 42nd-largest county figure in the state and 0.2% of the statewide total. The average system here reports serving 298 people, well below the Idaho average of 899. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Oneida County's drinking water come from?
By primary water source, Oneida County's active systems draw on groundwater (10, 100%). Overall, all rely mainly on groundwater (including purchased groundwater) and none on surface water, compared with 96% and 4.1% across Idaho. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, City of Malad, draws primarily on groundwater.
What kinds of water systems operate in Oneida County?
Oneida County's active systems break down as 1 community systems (10%), 1 non-transient non-community systems (10%) and 8 transient non-community systems (80%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as state government (30%), federal government (30%), private (20%) and local government (20%).
Water systems in Oneida County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Malad City of | Oneida | 2,200 | Community | Groundwater |
| 2 | Itd Juniper Rest Area | Oneida | 450 | Transient non-community | Groundwater |
| 3 | Cjs Travel Stop | Oneida | 100 | Transient non-community | Groundwater |
| 4 | Sunrise Summit Resort | Oneida | 60 | Transient non-community | Groundwater |
| 5 | Usfs Summit Campground | Oneida | 35 | Transient non-community | Groundwater |
| 6 | Stone Elementary School Dist 351 | Oneida | 35 | Non-transient non-community | Groundwater |
| 7 | Malad Summit Rest Area Itd | Oneida | 25 | Transient non-community | Groundwater |
| 8 | Usfs Third Creek Recreation Area | Oneida | 25 | Transient non-community | Groundwater |
| 9 | Usfs Curlew Campground | Oneida | 25 | Transient non-community | Groundwater |
| 10 | Itd Cherry Creek Rest Area | Oneida | 25 | Transient non-community | Groundwater |
Oneida County water systems: frequently asked questions
How many public water systems are in Oneida County, Idaho?
EPA's SDWIS records file 10 active public water systems under Oneida County, Idaho: 1 community systems (10%), 1 non-transient non-community systems (10%) and 8 transient non-community systems (80%).
Who supplies drinking water in Oneida County, ID?
The largest community water system filed under Oneida County is City of Malad (2,200 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Oneida County's drinking water come from groundwater or surface water?
Of the 10 active public water systems in Oneida County, all draw mainly on groundwater and none on surface water, counting purchased supplies. The largest system, City of Malad, uses groundwater.
Where can I find a water quality report for Oneida County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 1 community system is filed under Oneida County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Oneida County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Idaho water systems
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Oneida County, Idaho”, https://aquacensus.com/water-systems/idaho/oneida (data as of October 1, 2026).