Public water system · ID7300061
ActiveWilliams Lake Subd
At a glance
Williams Lake Subd (PWSID ID7300061) is an active transient non-community water system in Lemhi County, Idaho. It reports serving 200 people through 80 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
200
Service connections
80
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Williams Lake Subd compare with other water systems in Lemhi County?
By EPA's size categories, Williams Lake Subd is a very small system (500 people or fewer). Lemhi County has 42 active public water systems, and Williams Lake Subd is the 3rd-largest of them by population served. Its population served is about 45% above the county average of 138 people per system, and accounts for 3.5% of the 5,780 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Williams Lake Subd is about 39% above that figure.
What does “transient non-community water system” mean?
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. Idaho has 954 active transient non-community water systems, 49% of the state's 1,961 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,861 Idaho systems (95%) list groundwater as their primary source.
Who owns and regulates Williams Lake Subd?
EPA lists Williams Lake Subd as privately owned. The ID state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 42 active systems in Lemhi County (48%) are also privately owned.
Does Williams Lake Subd have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2022. The violations listed here began between July 2011 and August 2022. By type: 8 monitoring and reporting and 4 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 8 as resolved and 4 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2022-01-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2022-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-12-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2019-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2014-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2013-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2011-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Williams Lake Subd: frequently asked questions
Who runs Williams Lake Subd?
Williams Lake Subd (PWSID ID7300061) is a transient non-community water system privately owned. It is regulated by the ID state drinking water program.
How many people does Williams Lake Subd serve?
Williams Lake Subd reports serving 200 people through 80 service connections in Lemhi County, Idaho.
Where does Williams Lake Subd get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Williams Lake Subd have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2022. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Williams Lake Subd's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in August 2022. For current results, consult EPA ECHO, or the ID state drinking water program.
Where can I find Williams Lake Subd's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Williams Lake Subd is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Lemhi County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Salmon City of | Lemhi | 3,158 | Community | Surface water |
| Lemhi (Salmon) LDS Chapel | Lemhi | 203 | Transient non-community | Groundwater |
| Elk Bend Unit 1 | Lemhi | 200 | Community | Groundwater |
| LDS Church Leadore | Lemhi | 151 | Transient non-community | Groundwater |
| Lemhi County Fairgrounds | Lemhi | 150 | Transient non-community | Groundwater |
| Blm Morgan Bar Recreation Site | Lemhi | 140 | Transient non-community | Groundwater |
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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, “Williams Lake Subd, PWSID ID7300061, Idaho”, https://aquacensus.com/water-systems/idaho/williams-lake-subd-id7300061 (data as of October 1, 2026).