Public water system · ID5070028
ActiveKetchum City of
At a glance
City of Ketchum (PWSID ID5070028) is an active community water system in Blaine County, Idaho. It reports serving 3,555 people through 2,100 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,555
Service connections
2,100
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Ketchum compare with other water systems in Blaine County?
By EPA's size categories, City of Ketchum is a medium system (3,301 to 10,000 people). Blaine County has 43 active public water systems, and City of Ketchum is the 2nd-largest of them by population served. Its population served is about 6.4 times the county average of 552 people per system, and accounts for 15% of the 23,727 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Ketchum is about half of that figure.
What does “community water system” mean?
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. Idaho has 765 active community water systems, 39% 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 City of Ketchum?
EPA lists City of Ketchum as owned by a local government. 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. 6 of the 43 active systems in Blaine County (14%) are also owned by a local government.
Does City of Ketchum have drinking water violations?
EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in October 2025. The violations listed here began between November 1992 and October 2025. By type: 6 monitoring and reporting, 1 monitoring and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 7 as archived and 1 as resolved. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Archived |
| 2025-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Archived |
| 2013-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2013-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 1993-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 8 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.
City of Ketchum: frequently asked questions
Who runs City of Ketchum?
City of Ketchum (PWSID ID5070028) is a community water system owned by a local government. It is regulated by the ID state drinking water program.
How many people does City of Ketchum serve?
City of Ketchum reports serving 3,555 people through 2,100 service connections in Blaine County, Idaho.
Where does City of Ketchum 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 City of Ketchum have any drinking water violations?
EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in October 2025. 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 City of Ketchum'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. EPA's records list 8 violations for this system; 1 is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the ID state drinking water program.
Where can I find City of Ketchum's water quality report?
As a community water system, City of Ketchum must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Blaine County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hailey Water and Sewer | Blaine | 8,000 | Community | Groundwater |
| Sun Valley Water and Sewer Dist | Blaine | 3,400 | Community | Groundwater |
| Bellevue City of | Blaine | 2,747 | Community | Groundwater |
| Bald Mountain | Blaine | 1,000 | Transient non-community | Groundwater |
| Carey Water and Sewer | Blaine | 993 | Community | Groundwater |
| Mid Valley Water Company LLC | Blaine | 450 | 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, “Ketchum City of, PWSID ID5070028, Idaho”, https://aquacensus.com/water-systems/idaho/ketchum-city-of-id5070028 (data as of October 1, 2026).