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Community Water System · PWS AZ0403088

Cs Flagstaff Ranch Water Company

Des Peres, Arizona 63131 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
179
EPA violations
22
Health-based
Untested
UCMR5 result

The verdict

EPA records 179 drinking-water violations at Cs Flagstaff Ranch Water Company, 12% of them health-based - above the Arizona per-system average.

179
Total EPA violations on record
12%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Cs Flagstaff Ranch Water Company

Cs Flagstaff Ranch Water Company is a public/private-owned community water system that delivers drinking water to 350 residents in Des Peres, Arizona (Coconino County) through 350 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 179 total violations for this system , of which 22 (12%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 124 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 Arsenic, recorded in 76 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 Flagstaff Ranch Water Company's 179 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
350
Total Violations
179
Health-Based Violations
22
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Public/Private
Connections
350
County
Coconino
School/Daycare
No
MCL Violations
22
Monitoring Violations
124
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MR 76 2025
Consumer Confidence Rule Other 21 2025
Lead and Copper Rule MR 21 2025
Arsenic MCL 18 2018
Nitrate MR 10 2009
Public Notice Other 8 2024
Coliform (TCR) MR 6 2008
Coliform (TCR) MCL 4 2008
Revised Total Coliform Rule MON 4 2023
Total Haloacetic Acids (HAA5) MR 3 2011
TTHM MR 3 2011
LEAD AND COPPER RULE REVISIONS RPT 2 2024
Endothall MR 1 2004
Revised Total Coliform Rule RPT 1 2017

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 Flagstaff Ranch 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 AZ0403088 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 Flagstaff Ranch 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 Arsenic MR 76 SDWIS / AZ0403088 / 1005
2025 Consumer Confidence Rule Other 21 SDWIS / AZ0403088 / 7000
2025 Lead and Copper Rule MR 21 SDWIS / AZ0403088 / 5000
2024 Public Notice Other 8 SDWIS / AZ0403088 / 7500
2024 LEAD AND COPPER RULE REVISIONS RPT 2 SDWIS / AZ0403088 / 5200
2023 Revised Total Coliform Rule MON 4 SDWIS / AZ0403088 / 8000
2018 Arsenic MCL 18 SDWIS / AZ0403088 / 1005
2017 Revised Total Coliform Rule RPT 1 SDWIS / AZ0403088 / 8000
2011 Total Haloacetic Acids (HAA5) MR 3 SDWIS / AZ0403088 / 2456
2011 TTHM MR 3 SDWIS / AZ0403088 / 2950
2009 Nitrate MR 10 SDWIS / AZ0403088 / 1040
2008 Coliform (TCR) MR 6 SDWIS / AZ0403088 / 3100
2008 Coliform (TCR) MCL 4 SDWIS / AZ0403088 / 3100
2004 Endothall MR 1 SDWIS / AZ0403088 / 2033

How Cs Flagstaff Ranch Water Company Compares

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

Metric Cs Flagstaff Ranch Water Company Arizona avg Federal benchmark
Total violations 179 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 22 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 350 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 Flagstaff Ranch Water Company water safe to drink? ▼
Cs Flagstaff Ranch Water Company (PWS ID: AZ0403088) has 179 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Cs Flagstaff Ranch Water Company serve? ▼
Cs Flagstaff Ranch Water Company serves 350 people in Des Peres, Arizona. It is a Public/Private-owned system using Groundwater water sources with 350 service connections.
What type of violations does Cs Flagstaff Ranch Water Company have? ▼
Cs Flagstaff Ranch Water Company has 179 total violations: 22 health-based violations (MCL exceedances or treatment failures), 124 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Cs Flagstaff Ranch Water Company water? ▼
No PFAS testing data is available for Cs Flagstaff Ranch Water Company under the EPA's UCMR5 monitoring program.
What water source does Cs Flagstaff Ranch Water Company use? ▼
Cs Flagstaff Ranch 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.