Public water system · AZ0402004
ActiveArizona Water Co - Sierra Vista
At a glance
Arizona Water Co - Sierra Vista (PWSID AZ0402004) is an active community water system in Cochise County, Arizona. It reports serving 9,175 people through 3,245 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, one is health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,175
Service connections
3,245
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Arizona Water Co - Sierra Vista compare with other water systems in Cochise County?
By EPA's size categories, Arizona Water Co - Sierra Vista is a medium system (3,301 to 10,000 people). Cochise County has 104 active public water systems, and Arizona Water Co - Sierra Vista is the 5th-largest of them by population served. Its population served is about 7.3 times the county average of 1,253 people per system, and accounts for 7% of the 130,277 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 Arizona Water Co - Sierra Vista is about 37% above 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 Arizona Water Co - Sierra Vista?
EPA lists Arizona Water Co - Sierra Vista 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. 46 of the 104 active systems in Cochise County (44%) are also privately owned.
Does Arizona Water Co - Sierra Vista have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024. The violations listed here began between July 2006 and October 2024. By type: 7 monitoring and reporting, 3 public notice, recordkeeping or other, 1 required treatment not met and 1 reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (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 |
|---|---|---|---|---|
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2024-10-17 | ReportingLSL Reporting · code 4G | Lead and Copper Rule Revisionscode 5200 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2010-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2009-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2009-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2008-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-10-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2006-07-01 | 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.
Arizona Water Co - Sierra Vista: frequently asked questions
Who runs Arizona Water Co - Sierra Vista?
Arizona Water Co - Sierra Vista (PWSID AZ0402004) is a community water system privately owned. It is regulated by the AZ state drinking water program.
How many people does Arizona Water Co - Sierra Vista serve?
Arizona Water Co - Sierra Vista reports serving 9,175 people through 3,245 service connections in Cochise County, Arizona.
Where does Arizona Water Co - Sierra Vista 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 Arizona Water Co - Sierra Vista have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024. 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 Arizona Water Co - Sierra Vista'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, one is health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the AZ state drinking water program.
Where can I find Arizona Water Co - Sierra Vista's water quality report?
As a community water system, Arizona Water Co - Sierra Vista 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 Cochise County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Bella Vista City Water System | Cochise | 20,045 | Community | Groundwater |
| Douglas City of | Cochise | 16,656 | Community | Groundwater |
| Us Army Fort Huachuca | Cochise | 15,603 | Community | Groundwater |
| Pueblo Del Sol Water Company | Cochise | 12,804 | Community | Groundwater |
| Arizona Water Co - Bisbee | Cochise | 8,707 | Community | Groundwater |
| Benson, City of Water System | Cochise | 5,355 | 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, “Arizona Water Co - Sierra Vista, PWSID AZ0402004, Arizona”, https://aquacensus.com/water-systems/arizona/arizona-water-co-sierra-vista-az0402004 (data as of October 1, 2026).