Public water system · AZ0414080
ActiveCs Tierra Mesa Estates Water Company
At a glance
Cs Tierra Mesa Estates Water Company (PWSID AZ0414080) is an active community water system in Yuma County, Arizona. It reports serving 632 people through 247 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, 5 are health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
632
Service connections
247
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cs Tierra Mesa Estates Water Company compare with other water systems in Yuma County?
By EPA's size categories, Cs Tierra Mesa Estates Water Company is a small system (501 to 3,300 people). Yuma County has 50 active public water systems. Its population served is well below the county average of 4,392 people per system, and accounts for 0.3% of the 219,583 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 Cs Tierra Mesa Estates Water Company 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 Cs Tierra Mesa Estates Water Company?
EPA lists Cs Tierra Mesa Estates Water Company 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. 19 of the 50 active systems in Yuma County (38%) are also privately owned.
Does Cs Tierra Mesa Estates Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2026. The violations listed here began between July 2024 and January 2026. By type: 5 contaminant level above the legal limit, 4 public notice, recordkeeping or other and 3 monitoring and reporting. The contaminant or rule involved most often is Combined Uranium (8 of them). EPA lists 7 as resolved and 5 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 |
|---|---|---|---|---|
| 2026-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Archived |
| 2025-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2025-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Archived |
| 2025-06-28 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-06-28 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Archived |
| 2025-02-20 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Archived |
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2024-11-09 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2024-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2024-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | 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.
Cs Tierra Mesa Estates Water Company: frequently asked questions
Who runs Cs Tierra Mesa Estates Water Company?
Cs Tierra Mesa Estates Water Company (PWSID AZ0414080) is a community water system privately owned. It is regulated by the AZ state drinking water program.
How many people does Cs Tierra Mesa Estates Water Company serve?
Cs Tierra Mesa Estates Water Company reports serving 632 people through 247 service connections in Yuma County, Arizona.
Where does Cs Tierra Mesa Estates Water Company 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 Cs Tierra Mesa Estates Water Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in January 2026. 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 Cs Tierra Mesa Estates Water Company'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, 5 are health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the AZ state drinking water program.
Where can I find Cs Tierra Mesa Estates Water Company's water quality report?
As a community water system, Cs Tierra Mesa Estates Water Company 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 Yuma County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| City of Yuma | Yuma | 103,264 | Community | Surface water |
| San Luis City of | Yuma | 39,705 | Community | Groundwater |
| Foothills Water and Sewer LLC | Yuma | 32,425 | Community | Surface water |
| Somerton City of | Yuma | 14,197 | Community | Groundwater |
| Usmc Yuma Main System | Yuma | 8,353 | Community | Surface water |
| Aspc Yuma | Yuma | 4,197 | 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, “Cs Tierra Mesa Estates Water Company, PWSID AZ0414080, Arizona”, https://aquacensus.com/water-systems/arizona/cs-tierra-mesa-estates-water-company-az0414080 (data as of October 1, 2026).