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Community Water System · PWS AZ0414080

Cs Tierra Mesa Estates Water Company

Des Peres, Arizona 63131 - drinking water served from groundwater sources to 632 people, tracked in EPA SDWIS and UCMR5.

632
People served
284
EPA violations
75
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 284 drinking-water violations at Cs Tierra Mesa Estates Water Company, 26% of them health-based - above the Arizona per-system average.

284
Total EPA violations on record
26%
Health-based (MCL / treatment failure)
632
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cs Tierra Mesa Estates Water Company

Cs Tierra Mesa Estates Water Company is a private-owned community water system that delivers drinking water to 632 residents in Des Peres, Arizona (Yuma County) through 247 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 284 total violations for this system , of which 75 (26%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 157 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Combined Uranium, recorded in 74 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Arizona, EPA tracks 1,493 public water systems serving 7,322,166 people, with 228,944 cumulative violations and 15,663 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 153.3 violations. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Cs Tierra Mesa Estates Water Company's 284 violations sit above the Arizona average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
632
Total Violations
284
Health-Based Violations
75
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
247
County
Yuma
School/Daycare
No
MCL Violations
75
Monitoring Violations
157
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Uranium MCL 74 2025
Lead and Copper Rule MR 26 2022
Public Notice Other 24 2025
Coliform (TCR) MR 21 2015
Consumer Confidence Rule Other 18 2021
Combined Uranium MR 12 2025
Nitrate MR 12 2004
Revised Total Coliform Rule MON 6 2024
Endrin MR 3 2001
E. COLI MR 2 2016
1,2,4-Trichlorobenzene MR 2 2002
Xylenes, Total MR 2 2002
1,1-Dichloroethylene MR 2 2002
1,2-Dichloroethane MR 2 2002
1,1,1-Trichloroethane MR 2 2002
1,1,2-Trichloroethane MR 2 2002
Toluene MR 2 2002
Styrene MR 2 2002
DICHLOROMETHANE MR 2 2002
o-Dichlorobenzene MR 2 2002
trans-1,2-Dichloroethylene MR 2 2002
Carbon tetrachloride MR 2 2002
Benzene MR 2 2002
Endothall MR 2 2001
Ethylbenzene MR 2 2002
cis-1,2-Dichloroethylene MR 2 2002
Thallium, Total MR 1 1998
Nickel MR 1 1998
Barium MR 1 1998
Chromium MR 1 1998

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 9/12/2023 <7.00 ppt 7.00 ppt Not Detected
8:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/12/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/12/2023 <8.00 ppt 8.00 ppt Not Detected
PFBA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
NEtFOSAA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
6:2 FTS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/12/2023 <6.00 ppt 6.00 ppt Not Detected
ADONA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/12/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/12/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/12/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/12/2023 <2.00 ppt 2.00 ppt Not Detected
HFPO-DA 3/20/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 3/20/2023 <6.00 ppt 6.00 ppt Not Detected
PFPeS 3/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 3/20/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 3/20/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 3/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 3/20/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 3/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 3/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 3/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 3/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 3/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 3/20/2023 <4.00 ppt 4.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Cs Tierra Mesa Estates Water Company.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AZ0414080 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arizona Drinking Water Authority

Arizona DEQ, Drinking Water Program is the primacy agency that licenses and inspects Cs Tierra Mesa Estates Water Company under EPA-delegated authority.

Open AZ regulator portal

Source: Arizona DEQ, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Combined Uranium MCL 74 SDWIS / AZ0414080 / 4006
2025 Public Notice Other 24 SDWIS / AZ0414080 / 7500
2025 Combined Uranium MR 12 SDWIS / AZ0414080 / 4006
2024 Revised Total Coliform Rule MON 6 SDWIS / AZ0414080 / 8000
2022 Lead and Copper Rule MR 26 SDWIS / AZ0414080 / 5000
2021 Consumer Confidence Rule Other 18 SDWIS / AZ0414080 / 7000
2018 Revised Total Coliform Rule RPT 1 SDWIS / AZ0414080 / 8000
2016 E. COLI MR 2 SDWIS / AZ0414080 / 3014
2015 Coliform (TCR) MR 21 SDWIS / AZ0414080 / 3100
2004 Nitrate MR 12 SDWIS / AZ0414080 / 1040
2002 1,2,4-Trichlorobenzene MR 2 SDWIS / AZ0414080 / 2378
2002 Xylenes, Total MR 2 SDWIS / AZ0414080 / 2955
2002 1,1-Dichloroethylene MR 2 SDWIS / AZ0414080 / 2977
2002 1,2-Dichloroethane MR 2 SDWIS / AZ0414080 / 2980
2002 1,1,1-Trichloroethane MR 2 SDWIS / AZ0414080 / 2981

How Cs Tierra Mesa Estates Water Company Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Cs Tierra Mesa Estates Water Company Arizona avg Federal benchmark
Total violations 284 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 75 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 632 4,904 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,493 regulated public water systems in Arizona.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Cs Tierra Mesa Estates Water Company water safe to drink? ▼
Cs Tierra Mesa Estates Water Company (PWS ID: AZ0414080) has 284 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 632 people using Groundwater sources.
How many people does Cs Tierra Mesa Estates Water Company serve? ▼
Cs Tierra Mesa Estates Water Company serves 632 people in Des Peres, Arizona. It is a Private-owned system using Groundwater water sources with 247 service connections.
What type of violations does Cs Tierra Mesa Estates Water Company have? ▼
Cs Tierra Mesa Estates Water Company has 284 total violations: 75 health-based violations (MCL exceedances or treatment failures), 157 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cs Tierra Mesa Estates Water Company water? ▼
No. Cs Tierra Mesa Estates Water Company was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Cs Tierra Mesa Estates Water Company use? ▼
Cs Tierra Mesa Estates Water Company uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.