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Community Water System · PWS AZ0413020

Coldwater Canyon 1

Tucson, Arizona 85745 - drinking water served from groundwater sources to 541 people, tracked in EPA SDWIS and UCMR5.

541
People served
216
EPA violations
22
Health-based
Untested
UCMR5 result

The verdict

EPA records 216 drinking-water violations at Coldwater Canyon 1, 10% of them health-based - above the Arizona per-system average.

216
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
541
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Coldwater Canyon 1

Coldwater Canyon 1 is a private-owned community water system that delivers drinking water to 541 residents in Tucson, Arizona (Yavapai County) through 239 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 216 total violations for this system , of which 22 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 163 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 Coliform (TCR), recorded in 28 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%).

Coldwater Canyon 1's 216 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
541
Total Violations
216
Health-Based Violations
22
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
239
County
Yavapai
School/Daycare
No
MCL Violations
22
Monitoring Violations
163
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 28 2015
Chlorine MR 25 2022
Lead and Copper Rule MR 23 2019
Consumer Confidence Rule Other 22 2022
Arsenic MCL 16 2023
Arsenic MR 11 2025
Nitrate MR 8 2006
Coliform (TCR) MCL 6 2010
Gross Alpha, Excl. Radon and U MR 4 1986
E. COLI MR 2 2015
Revised Total Coliform Rule MON 2 2017
TTHM MR 2 2016
Total Haloacetic Acids (HAA5) MR 2 2016
Public Notice Other 2 2022
1,2,4-Trichlorobenzene MR 1 1998
Xylenes, Total MR 1 1998
DICHLOROMETHANE MR 1 1998
o-Dichlorobenzene MR 1 1998
trans-1,2-Dichloroethylene MR 1 1998
1,2-Dichloroethane MR 1 1998
1,2-Dichloropropane MR 1 1998
1,1,2-Trichloroethane MR 1 1998
Tetrachloroethylene MR 1 1998
CHLOROBENZENE MR 1 1998
Benzene MR 1 1998
Styrene MR 1 1998
Endrin MR 1 1998
Toxaphene MR 1 1998
Endothall MR 1 1998
OXAMYL 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 Coldwater Canyon 1.

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 AZ0413020 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 Coldwater Canyon 1 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 11 SDWIS / AZ0413020 / 1005
2023 Arsenic MCL 16 SDWIS / AZ0413020 / 1005
2022 Chlorine MR 25 SDWIS / AZ0413020 / 0999
2022 Consumer Confidence Rule Other 22 SDWIS / AZ0413020 / 7000
2022 Public Notice Other 2 SDWIS / AZ0413020 / 7500
2019 Lead and Copper Rule MR 23 SDWIS / AZ0413020 / 5000
2017 Revised Total Coliform Rule MON 2 SDWIS / AZ0413020 / 8000
2016 TTHM MR 2 SDWIS / AZ0413020 / 2950
2016 Total Haloacetic Acids (HAA5) MR 2 SDWIS / AZ0413020 / 2456
2015 Coliform (TCR) MR 28 SDWIS / AZ0413020 / 3100
2015 E. COLI MR 2 SDWIS / AZ0413020 / 3014
2010 Coliform (TCR) MCL 6 SDWIS / AZ0413020 / 3100
2006 Nitrate MR 8 SDWIS / AZ0413020 / 1040
1998 1,2,4-Trichlorobenzene MR 1 SDWIS / AZ0413020 / 2378
1998 Xylenes, Total MR 1 SDWIS / AZ0413020 / 2955

How Coldwater Canyon 1 Compares

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

Metric Coldwater Canyon 1 Arizona avg Federal benchmark
Total violations 216 153.3 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 541 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 Coldwater Canyon 1 water safe to drink? ▼
Coldwater Canyon 1 (PWS ID: AZ0413020) has 216 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 541 people using Groundwater sources.
How many people does Coldwater Canyon 1 serve? ▼
Coldwater Canyon 1 serves 541 people in Tucson, Arizona. It is a Private-owned system using Groundwater water sources with 239 service connections.
What type of violations does Coldwater Canyon 1 have? ▼
Coldwater Canyon 1 has 216 total violations: 22 health-based violations (MCL exceedances or treatment failures), 163 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Coldwater Canyon 1 water? ▼
No PFAS testing data is available for Coldwater Canyon 1 under the EPA's UCMR5 monitoring program.
What water source does Coldwater Canyon 1 use? ▼
Coldwater Canyon 1 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.