Public water system · ID5420027
ActiveHansen City of
At a glance
City of Hansen (PWSID ID5420027) is an active community water system in Twin Falls County, Idaho. It reports serving 1,200 people through 386 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in December 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,200
Service connections
386
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Hansen compare with other water systems in Twin Falls County?
By EPA's size categories, City of Hansen is a small system (501 to 3,300 people). Twin Falls County has 54 active public water systems, and City of Hansen is the 5th-largest of them by population served. Its population served is about 15% below the county average of 1,409 people per system, and accounts for 1.6% of the 76,088 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 Hansen is well below 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 Hansen?
EPA lists City of Hansen 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. 16 of the 54 active systems in Twin Falls County (30%) are also owned by a local government.
Does City of Hansen have drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in December 2025. The violations listed here began between October 1991 and December 2025. By type: 4 monitoring and reporting, 3 contaminant level above the legal limit, 2 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 6 as archived, 3 as unaddressed 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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 |
|---|---|---|---|---|
| 2025-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2025-09-02 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Unaddressed |
| 2025-06-22 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2025-03-24 | Public notice, recordkeeping or otherFailure to Consult with State · code 20 | Groundwater Rulecode 0700 | No | Unaddressed |
| 2008-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2006-05-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2006-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Archived |
| 2005-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2004-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1991-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 10 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 Hansen: frequently asked questions
Who runs City of Hansen?
City of Hansen (PWSID ID5420027) 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 Hansen serve?
City of Hansen reports serving 1,200 people through 386 service connections in Twin Falls County, Idaho.
Where does City of Hansen 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 Hansen have any drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in December 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 Hansen'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 10 violations for this system; 4 are health-based, and the most recent began in December 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 Hansen's water quality report?
As a community water system, City of Hansen 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 Twin Falls County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Twin Falls City of | Twin Falls | 56,121 | Community | Groundwater |
| Kimberly City of | Twin Falls | 5,359 | Community | Groundwater |
| Buhl City of | Twin Falls | 4,518 | Community | Groundwater |
| Filer Water Works | Twin Falls | 2,858 | Community | Groundwater |
| LDS Church Kimberly Sc | Twin Falls | 659 | Transient non-community | Groundwater |
| Amalgamated Sugar Twin Falls | Twin Falls | 460 | Non-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, “Hansen City of, PWSID ID5420027, Idaho”, https://aquacensus.com/water-systems/idaho/hansen-city-of-id5420027 (data as of October 1, 2026).