Public water system · AZ0413057
ActiveYarnell Water Improvement Association
At a glance
Yarnell Water Improvement Association (PWSID AZ0413057) is an active community water system in Yavapai County, Arizona. It reports serving 515 people through 523 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 October 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
515
Service connections
523
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Yarnell Water Improvement Association compare with other water systems in Yavapai County?
By EPA's size categories, Yarnell Water Improvement Association is a small system (501 to 3,300 people). Yavapai County has 238 active public water systems. Its population served is about half of the county average of 938 people per system, and accounts for 0.2% of the 223,192 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active community water system reports serving 6,703 people, so Yarnell Water Improvement Association 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. Arizona has 936 active community water systems, 53% of the state's 1,769 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,612 Arizona systems (91%) list groundwater as their primary source.
Who owns and regulates Yarnell Water Improvement Association?
EPA lists Yarnell Water Improvement Association as privately owned. The AZ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 113 of the 238 active systems in Yavapai County (47%) are also privately owned.
Does Yarnell Water Improvement Association have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2023. The violations listed here began between October 2016 and October 2023. By type: 7 monitoring and reporting, 3 public notice, recordkeeping or other, 1 reporting and 1 monitoring. The contaminant or rule involved most often is Chlorine (4 of them). EPA lists 12 as resolved. 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 |
|---|---|---|---|---|
| 2023-10-02 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-10-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2021-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2020-01-26 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2016-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
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.
Yarnell Water Improvement Association: frequently asked questions
Who runs Yarnell Water Improvement Association?
Yarnell Water Improvement Association (PWSID AZ0413057) is a community water system privately owned. It is regulated by the AZ state drinking water program.
How many people does Yarnell Water Improvement Association serve?
Yarnell Water Improvement Association reports serving 515 people through 523 service connections in Yavapai County, Arizona.
Where does Yarnell Water Improvement Association 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 Yarnell Water Improvement Association 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 October 2023. 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 Yarnell Water Improvement Association'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 October 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the AZ state drinking water program.
Where can I find Yarnell Water Improvement Association's water quality report?
As a community water system, Yarnell Water Improvement Association 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 Yavapai County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Town of Prescott Valley | Yavapai | 57,048 | Community | Groundwater |
| Prescott City of | Yavapai | 42,217 | Community | Groundwater |
| Cottonwood Municipal Water Cw1 | Yavapai | 11,023 | Community | Groundwater |
| Big Park Water Company | Yavapai | 7,392 | Community | Groundwater |
| Town of Camp Verde Utilities | Yavapai | 5,013 | Community | Groundwater |
| Clarkdale Municipal Water System | Yavapai | 4,920 | 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, “Yarnell Water Improvement Association, PWSID AZ0413057, Arizona”, https://aquacensus.com/water-systems/arizona/yarnell-water-improvement-association-az0413057 (data as of October 1, 2026).