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Counties → Navajo Nation

County NN001 County, Navajo Nation

Water Systems
51
Population Served
55,505
Total Violations
9,921
408 health-based
PFAS Detected
4
of 4 tested

Violation Analysis

100.0%
Systems with Violations
194.5
Avg Violations per System
4.1%
Health-Based Violations

Water Source Types

GW
47 systems (92%)
SW
3 systems (6%)

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 NN001 Navajo Nation water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

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
Fort Defiance-Window Rock-St Michaels NTUA 12,869 248 Clean
Chinle-Many Farms-Del Muerto NTUA 8,458 302 Clean
Ganado-Burnside-Cornfield-Steamboat NTUA 3,947 183 Detected
Sweetwater NTUA 2,014 156 -
New Lands NTUA 1,905 108 -
Lukachukai NTUA 1,659 80 -
Many Farms Community School BIA 1,506 230 -
Cottonwood-Tselani NTUA 1,334 66 -
Canoncito 1,326 898 -
Tsaile-Dine College NTUA 1,190 124 -
Dennehotso NTUA 1,040 50 -
Rock Point NTUA 1,029 129 -
Houck-Querino Canyon NTUA 1,023 46 -
Chinle High School 975 250 -
Klagetoh NTUA 971 96 -
Red Mesa Public Schools 900 857 -
Round Rock NTUA 876 61 -
Tsehootsooi Middle School 875 309 -
Nazlini NTUA 862 179 -
Kinlichee NTUA 787 56 -
Rock Point Community School BIA 758 116 -
Red Valley North NTUA 756 44 -
Teec Nos Pos NTUA 752 64 -
Cove NTUA 728 120 -
Ganado Public Schools 684 395 Clean
St Michael Indian School 585 1,202 -
Lukachukai Community School new 500 13 -
Rough Rock NTUA 455 44 -
Canoncito Community Day School BIA 437 141 -
Round Rock Elementary School 396 801 -
Oak Springs NTUA (south of Hunters Point) 390 44 -
Rough Rock Community High School BIA 350 134 -
Ganado Mission - Sage Memorial Hospital 349 236 -
Wheatfields NTUA 321 115 -
Teec Nos Pos Community Boarding School BIA 300 96 -
Dennehotso Boarding School BIA 300 101 -
Nazlini Community Boarding School BIA 230 182 -
Pine Springs NTUA 222 114 -
Chinle USD 24 Administration Center 220 210 -
Wide Ruins Community Boarding School BIA 215 104 -
Rough Rock Demonstration School BIA 200 181 -
Kinlichee Community School BIA 174 106 -
Hunters Point Boarding School BIA 173 132 -
Pine Springs Day School BIA 122 61 -
Kinlichee Staff Housing BIA 80 145 -
Cane Valley NTUA 58 35 -
Canyon De Chelly National Monument 55 185 -
Red Rock (Red Valley) Day School BIA 55 193 -
Baby Rocks NTUA 44 20 -
Transwestern Pipeline Company - Klagetoh - 4 25 95 -

Other Counties in Navajo Nation

County NN031 County
29 systems · 27,501 served · 3,615 violations
County NN017 County
27 systems · 26,234 served · 4,391 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 NN001 County? ▼
County NN001 County has 9,921 total drinking water violations across 51 water systems, of which 408 are health-based violations. 100.0% of systems have at least one violation.
How many people get water from County NN001 County systems? ▼
Water systems in County NN001 County serve approximately 55,505 people through 51 public water systems.
Has PFAS been detected in County NN001 County water? ▼
Of 4 water systems tested for PFAS in County NN001 County, 4 had PFAS detected (100.0% detection rate).
What types of water sources supply County NN001 County? ▼
Water systems in County NN001 County use GW (47 systems), SW (3 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. 4.1% of County NN001 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.