PlainWater
States → Navajo Nation

Community Water System · PWS NN3500287

Canoncito

Canoncito, Navajo Nation 87026 - drinking water served from groundwater sources to 1,326 people, tracked in EPA SDWIS and UCMR5.

1,326
People served
898
EPA violations
7
Health-based
Untested
UCMR5 result

The verdict

EPA records 898 drinking-water violations at Canoncito, 1% of them health-based - above the Navajo Nation per-system average.

898
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
1,326
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Canoncito

Canoncito is a native american-owned community water system that delivers drinking water to 1,326 residents in Canoncito, Navajo Nation through 390 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 898 total violations for this system , of which 7 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 731 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 173 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 Navajo Nation, EPA tracks 170 public water systems serving 167,275 people, with 29,535 cumulative violations and 1,366 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 173.7 violations. Statewide, 13 of 13 UCMR5-tested systems have reported PFAS detections (100%).

Canoncito's 898 violations sit above the Navajo Nation 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
1,326
Total Violations
898
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
390
School/Daycare
No
MCL Violations
3
Monitoring Violations
731
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 173 2015
Revised Total Coliform Rule MON 104 2025
Public Notice Other 55 2025
Consumer Confidence Rule Other 36 2023
Nitrate MR 32 2024
Nitrite MR 24 2024
2,3,7,8-TCDD MR 10 2011
Revised Total Coliform Rule RPT 10 2025
E. COLI MR 9 2025
Total Haloacetic Acids (HAA5) MR 7 2012
TTHM MR 7 2012
BHC-GAMMA MR 6 2011
Methoxychlor MR 6 2011
Toxaphene MR 6 2011
Dalapon MR 6 2011
Diquat MR 6 2011
Endothall MR 6 2011
Glyphosate MR 6 2011
Di(2-ethylhexyl) adipate MR 6 2011
OXAMYL MR 6 2011
Simazine MR 6 2011
Di(2-ethylhexyl) phthalate MR 6 2011
Picloram MR 6 2011
Dinoseb MR 6 2011
Hexachlorocyclopentadiene MR 6 2011
Carbofuran MR 6 2011
Atrazine MR 6 2011
LASSO MR 6 2011
Heptachlor MR 6 2011
Heptachlor epoxide MR 6 2011

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 Canoncito.

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 NN3500287 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Navajo Nation Drinking Water Authority

Navajo Nation's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NN regulator via EPA SDWIS

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 Revised Total Coliform Rule MON 104 SDWIS / NN3500287 / 8000
2025 Public Notice Other 55 SDWIS / NN3500287 / 7500
2025 Revised Total Coliform Rule RPT 10 SDWIS / NN3500287 / 8000
2025 E. COLI MR 9 SDWIS / NN3500287 / 3014
2024 Nitrate MR 32 SDWIS / NN3500287 / 1040
2024 Nitrite MR 24 SDWIS / NN3500287 / 1041
2023 Consumer Confidence Rule Other 36 SDWIS / NN3500287 / 7000
2023 Revised Total Coliform Rule TT 4 SDWIS / NN3500287 / 8000
2022 Revised Total Coliform Rule MCL 3 SDWIS / NN3500287 / 8000
2021 Chlorine MR 3 SDWIS / NN3500287 / 0999
2016 Revised Total Coliform Rule Other 5 SDWIS / NN3500287 / 8000
2015 Coliform (TCR) MR 173 SDWIS / NN3500287 / 3100
2012 Total Haloacetic Acids (HAA5) MR 7 SDWIS / NN3500287 / 2456
2012 TTHM MR 7 SDWIS / NN3500287 / 2950
2011 2,3,7,8-TCDD MR 10 SDWIS / NN3500287 / 2063

How Canoncito Compares

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

Metric Canoncito Navajo Nation avg Federal benchmark
Total violations 898 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,326 984 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 170 regulated public water systems in Navajo Nation.

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 Canoncito water safe to drink? ▼
Canoncito (PWS ID: NN3500287) has 898 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,326 people using Groundwater sources.
How many people does Canoncito serve? ▼
Canoncito serves 1,326 people in Canoncito, Navajo Nation. It is a Native American-owned system using Groundwater water sources with 390 service connections.
What type of violations does Canoncito have? ▼
Canoncito has 898 total violations: 7 health-based violations (MCL exceedances or treatment failures), 731 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Canoncito water? ▼
No PFAS testing data is available for Canoncito under the EPA's UCMR5 monitoring program.
What water source does Canoncito use? ▼
Canoncito 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.