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Community Water System · PWS AZ0402110

Cs Winchester Water Company

Des Peres, Arizona 63131 - drinking water served from groundwater sources to 402 people, tracked in EPA SDWIS and UCMR5.

402
People served
128
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 128 drinking-water violations at Cs Winchester Water Company, 5% of them health-based - below the Arizona per-system average.

128
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
402
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cs Winchester Water Company

Cs Winchester Water Company is a private-owned community water system that delivers drinking water to 402 residents in Des Peres, Arizona (Cochise County) through 157 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 128 total violations for this system , of which 6 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 97 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 18 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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 Winchester Water Company's 128 violations sit below 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
402
Total Violations
128
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
157
County
Cochise
School/Daycare
No
MCL Violations
2
Monitoring Violations
97
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 18 2008
Consumer Confidence Rule Other 12 2022
Lead and Copper Rule MR 7 2023
Nitrate MR 4 2021
E. COLI MR 4 2023
Revised Total Coliform Rule TT 4 2022
Revised Total Coliform Rule RPT 3 2023
cis-1,2-Dichloroethylene MR 2 2002
Xylenes, Total MR 2 2002
DICHLOROMETHANE MR 2 2002
1,1-Dichloroethylene MR 2 2002
trans-1,2-Dichloroethylene MR 2 2002
Carbon tetrachloride MR 2 2002
1,2-Dichloropropane MR 2 2002
Trichloroethylene MR 2 2002
Benzene MR 2 2002
Ethylbenzene MR 2 2002
Styrene MR 2 2002
1,1,2-Trichloroethane MR 2 2002
Tetrachloroethylene MR 2 2002
CHLOROBENZENE MR 2 2002
Toluene MR 2 2002
Coliform (TCR) MCL 2 2010
1,1,1-Trichloroethane MR 2 2002
p-Dichlorobenzene MR 2 2002
o-Dichlorobenzene MR 2 2002
1,2-Dichloroethane MR 2 2002
1,2,4-Trichlorobenzene MR 2 2002
Endrin MR 1 1998
Dalapon MR 1 1998

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 Winchester 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 AZ0402110 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 Winchester 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
2023 Lead and Copper Rule MR 7 SDWIS / AZ0402110 / 5000
2023 E. COLI MR 4 SDWIS / AZ0402110 / 3014
2023 Revised Total Coliform Rule RPT 3 SDWIS / AZ0402110 / 8000
2022 Consumer Confidence Rule Other 12 SDWIS / AZ0402110 / 7000
2022 Revised Total Coliform Rule TT 4 SDWIS / AZ0402110 / 8000
2021 Nitrate MR 4 SDWIS / AZ0402110 / 1040
2010 Coliform (TCR) MCL 2 SDWIS / AZ0402110 / 3100
2008 Coliform (TCR) MR 18 SDWIS / AZ0402110 / 3100
2002 cis-1,2-Dichloroethylene MR 2 SDWIS / AZ0402110 / 2380
2002 Xylenes, Total MR 2 SDWIS / AZ0402110 / 2955
2002 DICHLOROMETHANE MR 2 SDWIS / AZ0402110 / 2964
2002 1,1-Dichloroethylene MR 2 SDWIS / AZ0402110 / 2977
2002 trans-1,2-Dichloroethylene MR 2 SDWIS / AZ0402110 / 2979
2002 Carbon tetrachloride MR 2 SDWIS / AZ0402110 / 2982
2002 1,2-Dichloropropane MR 2 SDWIS / AZ0402110 / 2983

How Cs Winchester Water Company Compares

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

Metric Cs Winchester Water Company Arizona avg Federal benchmark
Total violations 128 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 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 402 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 Winchester Water Company water safe to drink? ▼
Cs Winchester Water Company (PWS ID: AZ0402110) has 128 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 402 people using Groundwater sources.
How many people does Cs Winchester Water Company serve? ▼
Cs Winchester Water Company serves 402 people in Des Peres, Arizona. It is a Private-owned system using Groundwater water sources with 157 service connections.
What type of violations does Cs Winchester Water Company have? ▼
Cs Winchester Water Company has 128 total violations: 6 health-based violations (MCL exceedances or treatment failures), 97 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cs Winchester Water Company water? ▼
No PFAS testing data is available for Cs Winchester Water Company under the EPA's UCMR5 monitoring program.
What water source does Cs Winchester Water Company use? ▼
Cs Winchester 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. 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.