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Community Water System · PWS AZ0409015

Holbrook City Of

Holbrook, Arizona 86025 - drinking water served from groundwater sources to 5,318 people, tracked in EPA SDWIS and UCMR5.

5,318
People served
207
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 207 drinking-water violations at Holbrook City Of, 2% of them health-based - above the Arizona per-system average.

207
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
5,318
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Holbrook City Of

Holbrook City Of is a local-owned community water system that delivers drinking water to 5,318 residents in Holbrook, Arizona (Navajo County) through 2,002 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 207 total violations for this system , of which 4 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 141 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 Consumer Confidence Rule, recorded in 26 violations (Other). 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%).

Holbrook City Of's 207 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
5,318
Total Violations
207
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
2,002
County
Navajo
School/Daycare
No
MCL Violations
2
Monitoring Violations
141
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 26 2025
Chlorine MR 25 2022
Revised Total Coliform Rule RPT 25 2024
2,4-D MR 17 2019
Lead and Copper Rule MR 13 2023
Coliform (TCR) MR 10 2015
Revised Total Coliform Rule MON 8 2024
Nitrate MR 5 2004
Total Haloacetic Acids (HAA5) MR 4 2019
TTHM MR 4 2019
Coliform (TCR) MCL 2 2008
E. COLI MR 2 2016
Groundwater Rule TT 2 2023
BHC-GAMMA MR 2 2003
Methoxychlor MR 2 2003
Toxaphene MR 2 2003
Dalapon MR 2 2003
Diquat MR 2 2003
Endothall MR 2 2003
Simazine MR 2 2003
Di(2-ethylhexyl) phthalate MR 2 2003
Dinoseb MR 2 2003
Atrazine MR 2 2003
2,4,5-TP MR 2 2003
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2003
Chlordane MR 2 2003
Endrin MR 2 2003
OXAMYL MR 2 2003
Heptachlor MR 2 2003
HEXACHLOROBENZENE MR 2 2003

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 174 samples detected PFAS.

Contaminant Date Result MRL Status
PFPeS 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
NFDHA 3/18/2025 <20.00 ppt 20.00 ppt Not Detected
PFEESA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFPeA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFOS 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFHxS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFNA 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
NEtFOSAA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFHpA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 3/18/2025 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFUnA 3/18/2025 <2.00 ppt 2.00 ppt Not Detected
PFHxA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFDA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 3/18/2025 <6.00 ppt 6.00 ppt Not Detected
PFTrDA 3/18/2025 <7.00 ppt 7.00 ppt Not Detected
PFTA 3/18/2025 <8.00 ppt 8.00 ppt Not Detected
4:2 FTS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFOA 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFBA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFTA 3/18/2025 <8.00 ppt 8.00 ppt Not Detected
6:2 FTS 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFMPA 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFPeA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFEESA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
NFDHA 3/18/2025 <20.00 ppt 20.00 ppt Not Detected
NMeFOSAA 3/18/2025 <6.00 ppt 6.00 ppt Not Detected
PFHpS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 3/18/2025 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
ADONA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 3/18/2025 <4.00 ppt 4.00 ppt Not Detected
PFBA 3/18/2025 <5.00 ppt 5.00 ppt Not Detected
PFBS 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFHpA 3/18/2025 <3.00 ppt 3.00 ppt Not Detected
PFNA 3/18/2025 <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 Holbrook City Of.

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 AZ0409015 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 Holbrook City Of 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 Consumer Confidence Rule Other 26 SDWIS / AZ0409015 / 7000
2024 Revised Total Coliform Rule RPT 25 SDWIS / AZ0409015 / 8000
2024 Revised Total Coliform Rule MON 8 SDWIS / AZ0409015 / 8000
2023 Lead and Copper Rule MR 13 SDWIS / AZ0409015 / 5000
2023 Groundwater Rule TT 2 SDWIS / AZ0409015 / 0700
2022 Chlorine MR 25 SDWIS / AZ0409015 / 0999
2020 Public Notice Other 2 SDWIS / AZ0409015 / 7500
2019 2,4-D MR 17 SDWIS / AZ0409015 / 2105
2019 Total Haloacetic Acids (HAA5) MR 4 SDWIS / AZ0409015 / 2456
2019 TTHM MR 4 SDWIS / AZ0409015 / 2950
2016 E. COLI MR 2 SDWIS / AZ0409015 / 3014
2015 Coliform (TCR) MR 10 SDWIS / AZ0409015 / 3100
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 2 SDWIS / AZ0409015 / 0600
2008 Coliform (TCR) MCL 2 SDWIS / AZ0409015 / 3100
2004 Nitrate MR 5 SDWIS / AZ0409015 / 1040

How Holbrook City Of Compares

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

Metric Holbrook City Of Arizona avg Federal benchmark
Total violations 207 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 5,318 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 Holbrook City Of water safe to drink?
Holbrook City Of (PWS ID: AZ0409015) has 207 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,318 people using Groundwater sources.
How many people does Holbrook City Of serve?
Holbrook City Of serves 5,318 people in Holbrook, Arizona. It is a Local-owned system using Groundwater water sources with 2,002 service connections.
What type of violations does Holbrook City Of have?
Holbrook City Of has 207 total violations: 4 health-based violations (MCL exceedances or treatment failures), 141 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Holbrook City Of water?
No. Holbrook City Of was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Holbrook City Of use?
Holbrook City Of 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.
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.