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Counties → Navajo Nation

County NN017 County, Navajo Nation

Water Systems
27
Population Served
26,234
Total Violations
4,391
296 health-based
PFAS Detected
4
of 4 tested

Violation Analysis

100.0%
Systems with Violations
162.6
Avg Violations per System
6.7%
Health-Based Violations

Water Source Types

GW
27 systems (100%)

PFAS Contamination

4
Systems Tested
4
PFAS Detected
100.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

County NN017 Navajo Nation water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (27)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Pinon-District 4 NTUA 5,195 59 Clean
Dilkon-Indian Wells-Greasewood-White Cone NTUA 4,986 223 Clean
Kayenta NTUA 3,844 258 Detected
Kayenta Sandstone Housing 1,375 304 -
Chilchinbeto NTUA 1,276 50 -
Shonto Junction NTUA 1,146 57 -
Jeddito NTUA 1,105 121 -
Hard Rock NTUA 982 74 -
Greasewood Springs Community Boarding School BIA 720 216 Clean
Shonto Preparatory Boarding School BIA 664 106 -
Kayenta Community Boarding School BIA 500 124 -
Pinon Community Dormitory School BIA 500 37 -
Dilcon Community Boarding School BIA 473 114 -
Peabody Western Coal Company - Black Mesa Mines 420 106 -
Kitsillie-Black Mesa NTUA 414 35 -
Shonto NTUA 397 35 -
Low Mountain Boarding School BIA 339 163 -
Long House Valley NTUA 277 33 -
Monument Valley Navajo Tribal Park 275 117 -
Rocky Ridge Boarding School BIA 250 163 -
Seba Dalkai Boarding School BIA 250 191 -
Forest Lake NTUA 233 45 -
White Post Mission NTUA 185 1,145 -
Cottonwood Day School BIA 185 113 -
Chilchinbeto Community Day School BIA 138 143 -
Sanostee (New) Day School BIA 80 11 -
Navajo National Monument 25 348 -

Other Counties in Navajo Nation

County NN001 County
51 systems · 55,505 served · 9,921 violations
County NN031 County
29 systems · 27,501 served · 3,615 violations
County NN045 County
19 systems · 25,958 served · 2,250 violations
County NN005 County
22 systems · 20,758 served · 1,970 violations
County NN037 County
13 systems · 6,907 served · 2,385 violations
County NN006 County
4 systems · 1,681 served · 2,483 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in County NN017 County? ▼
County NN017 County has 4,391 total drinking water violations across 27 water systems, of which 296 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from County NN017 County systems? ▼
Water systems in County NN017 County serve approximately 26,234 people through 27 public water systems.
Has PFAS been detected in County NN017 County water? ▼
Of 4 water systems tested for PFAS in County NN017 County, 4 had PFAS detected (100.0% detection rate).
What types of water sources supply County NN017 County? ▼
Water systems in County NN017 County use GW (27 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 6.7% of County NN017 County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

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 page draws directly on 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.