Ft Defiance Water Quality
Arizona
According to EPA SDWIS, Ft Defiance, Arizona is served by 83 community water systems covering about 122,667 people. The same extract lists 335 health-based violation records, most recently coded 1005 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Ft Defiance, Arizona is delivered through 83 EPA-regulated community water systems serving an estimated 122,667 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 335 violation records across the 83 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Arsenic, Revised Total Coliform Rule, TTHM, Coliform (TCR).
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Arizona drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| Farmington Rural-Shiprock-Beclabito NTUA | 15,233 | 4 | Health |
| Fort Defiance-Window Rock-St Michaels NTUA | 12,869 | 27 | Health |
| Chinle-Many Farms-Del Muerto NTUA | 8,458 | 0 | Clean |
| Pinon-District 4 NTUA | 5,195 | 0 | Clean |
| Mariano Lake-Pinedale-Church Rock NTUA | 4,562 | 0 | Clean |
| Crownpoint-Littlewater-Three Mile Point NTUA | 3,950 | 0 | Clean |
| Ganado-Burnside-Cornfield-Steamboat NTUA | 3,947 | 3 | Health |
| Kayenta NTUA | 3,844 | 0 | Clean |
| Leupp-Birdsprings-Tolani Lake NTUA | 2,100 | 2 | Health |
| Bread Springs-Chichiltah NTUA | 2,066 | 0 | Clean |
| Sweetwater NTUA | 2,014 | 37 | Health |
| Sanostee-Tocito NTUA | 1,953 | 0 | Clean |
| New Lands NTUA | 1,905 | 0 | Clean |
| Twin Lakes NTUA | 1,833 | 2 | Health |
| Tohatchi-Mexican Springs-Twin Lakes NTUA | 1,669 | 0 | Clean |
| Lukachukai NTUA | 1,659 | 0 | Clean |
| Defiance NTUA | 1,659 | 0 | Clean |
| Red Rock NTUA | 1,652 | 0 | Clean |
| Thoreau West-John Willie Camp-Baca NTUA | 1,611 | 0 | Clean |
| Kaibeto NTUA | 1,590 | 0 | Clean |
| Aneth NTUA | 1,481 | 71 | Health |
| Inscription House-Navajo Mountain NTUA | 1,368 | 0 | Clean |
| Cottonwood-Tselani NTUA | 1,334 | 0 | Clean |
| Chilchinbeto NTUA | 1,276 | 0 | Clean |
| Oljato NTUA | 1,276 | 0 | Clean |
| Tsaile-Dine College NTUA | 1,190 | 0 | Clean |
| Naschitti-Bisola NTUA | 1,173 | 0 | Clean |
| Shonto Junction NTUA | 1,146 | 2 | Health |
| Tonalea-Red Lake NTUA | 1,146 | 0 | Clean |
| Carson-Huerfano NTUA | 1,142 | 0 | Clean |
| LeChee NTUA | 1,115 | 2 | Health |
| Ojo Encino North NTUA | 1,108 | 0 | Clean |
| Jeddito NTUA | 1,105 | 0 | Clean |
| Dennehotso NTUA | 1,040 | 0 | Clean |
| Rock Point NTUA | 1,029 | 0 | Clean |
| Red Mesa NTUA | 1,023 | 20 | Health |
| Hard Rock NTUA | 982 | 0 | Clean |
| Houck-Querino Canyon NTUA | 971 | 2 | Health |
| Klagetoh NTUA | 971 | 0 | Clean |
| Casamero Lake-Smith Lake NTUA | 906 | 0 | Clean |
| Toadlena NTUA | 903 | 82 | Health |
| Round Rock NTUA | 876 | 0 | Clean |
| Tsa Yah Toh NTUA | 865 | 0 | Clean |
| Nazlini NTUA | 862 | 0 | Clean |
| Narbona Pass NTUA | 862 | 0 | Clean |
| Sawmill NTUA | 838 | 0 | Clean |
| Iyanbito NTUA | 797 | 0 | Clean |
| Kinlichee NTUA | 787 | 0 | Clean |
| Nageezi NTUA | 763 | 0 | Clean |
| Red Valley North NTUA | 756 | 0 | Clean |
| Teec Nos Pos NTUA | 752 | 0 | Clean |
| Standing Rock NTUA | 739 | 0 | Clean |
| Cove NTUA | 728 | 0 | Clean |
| Crystal NTUA | 715 | 0 | Clean |
| Coyote Canyon-Bass Lake NTUA | 622 | 0 | Clean |
| Newcomb NTUA | 602 | 0 | Clean |
| White Rock-Lake Valley NTUA | 492 | 0 | Clean |
| Dzilth-Na-O-Dith-Hle NTUA | 462 | 0 | Clean |
| Rough Rock NTUA | 455 | 0 | Clean |
| Montezuma Creek NTUA | 424 | 0 | Clean |
| Kitsillie-Black Mesa NTUA | 414 | 0 | Clean |
| Shonto NTUA | 397 | 0 | Clean |
| Buffalo Springs NTUA | 397 | 0 | Clean |
| Oak Springs NTUA (south of Hunters Point) | 390 | 0 | Clean |
| Baca-Haystack NTUA | 376 | 0 | Clean |
| Mittenrock NTUA | 352 | 6 | Health |
| Coppermine NTUA | 342 | 2 | Health |
| Wheatfields NTUA | 321 | 3 | Health |
| Todahaidekani NTUA | 301 | 24 | Health |
| Mexican Water NTUA | 294 | 44 | Health |
| Long House Valley NTUA | 277 | 0 | Clean |
| Whitehorse Lake NTUA | 277 | 0 | Clean |
| Mexican Springs West Rural NTUA | 257 | 2 | Health |
| Mexican Hat NTUA | 239 | 0 | Clean |
| Forest Lake NTUA | 233 | 0 | Clean |
| Pine Springs NTUA | 222 | 0 | Clean |
| Casa Del Eco Mesa NTUA | 211 | 0 | Clean |
| White Post Mission NTUA | 185 | 0 | Clean |
| Keyah 1 NAPI NTUA | 133 | 0 | Clean |
| Cane Valley NTUA | 58 | 0 | Clean |
| Casamero Cup NTUA | 48 | 0 | Clean |
| Boardman Loop NTUA | 48 | 0 | Clean |
| Baby Rocks NTUA | 44 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| Toadlena NTUA | Arsenic | 2025-07-01 |
| Sweetwater NTUA | Arsenic | 2025-07-01 |
| Toadlena NTUA | Arsenic | 2025-04-01 |
| Fort Defiance-Window Rock-St Michaels NTUA | Revised Total Coliform Rule | 2025-02-01 |
| Toadlena NTUA | Arsenic | 2025-01-01 |
| Toadlena NTUA | Arsenic | 2024-10-01 |
| Toadlena NTUA | Arsenic | 2024-10-01 |
| Toadlena NTUA | Arsenic | 2024-10-01 |
| Fort Defiance-Window Rock-St Michaels NTUA | TTHM | 2024-10-01 |
| Fort Defiance-Window Rock-St Michaels NTUA | TTHM | 2024-10-01 |
| Red Mesa NTUA | Arsenic | 2024-07-01 |
| Red Mesa NTUA | Arsenic | 2024-07-01 |
| Red Mesa NTUA | Arsenic | 2024-07-01 |
| Toadlena NTUA | Arsenic | 2024-07-01 |
| Toadlena NTUA | Arsenic | 2024-07-01 |
| Toadlena NTUA | Arsenic | 2024-07-01 |
| Mexican Water NTUA | Arsenic | 2024-04-01 |
| Mexican Water NTUA | Arsenic | 2024-04-01 |
| Mexican Water NTUA | Arsenic | 2024-04-01 |
| Mexican Water NTUA | Arsenic | 2024-04-01 |
| Red Mesa NTUA | Arsenic | 2024-04-01 |
| Red Mesa NTUA | Arsenic | 2024-04-01 |
| Red Mesa NTUA | Arsenic | 2024-04-01 |
| Red Mesa NTUA | Arsenic | 2024-04-01 |
| Toadlena NTUA | Arsenic | 2024-04-01 |
| Toadlena NTUA | Arsenic | 2024-04-01 |
| LeChee NTUA | TTHM | 2024-04-01 |
| LeChee NTUA | TTHM | 2024-04-01 |
| Sweetwater NTUA | Arsenic | 2024-04-01 |
| Sweetwater NTUA | Arsenic | 2024-04-01 |
| Sweetwater NTUA | Arsenic | 2024-04-01 |
| Sweetwater NTUA | Arsenic | 2024-04-01 |
| Sweetwater NTUA | Arsenic | 2024-04-01 |
| Mexican Water NTUA | Arsenic | 2024-01-01 |
| Mexican Water NTUA | Arsenic | 2024-01-01 |
| Mexican Water NTUA | Arsenic | 2024-01-01 |
| Red Mesa NTUA | Arsenic | 2024-01-01 |
| Red Mesa NTUA | Arsenic | 2024-01-01 |
| Red Mesa NTUA | Arsenic | 2024-01-01 |
| Aneth NTUA | Arsenic | 2024-01-01 |
| Aneth NTUA | Arsenic | 2024-01-01 |
| Toadlena NTUA | Arsenic | 2024-01-01 |
| Toadlena NTUA | Arsenic | 2024-01-01 |
| Sweetwater NTUA | Arsenic | 2024-01-01 |
| Sweetwater NTUA | Arsenic | 2024-01-01 |
| Sweetwater NTUA | Arsenic | 2024-01-01 |
| Sweetwater NTUA | Arsenic | 2024-01-01 |
| Mexican Water NTUA | Arsenic | 2023-10-01 |
| Mexican Water NTUA | Arsenic | 2023-10-01 |
| Mexican Water NTUA | Arsenic | 2023-10-01 |
What are Ft Defiance's health-based records for?
Ft Defiance's health-based violation records carry 4 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Arsenic | 280 | 8 |
| Tthm | 31 | 3 |
| Revised Total Coliform Rule | 19 | 8 |
| Coliform (TCR) | 5 | 2 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Ft Defiance, Arizona? ▼
How many water violations does Ft Defiance have in this EPA extract? ▼
What contaminants were found in Ft Defiance water? ▼
How many water systems serve Ft Defiance? ▼
Where does Ft Defiance get its drinking water? ▼
How does Ft Defiance compare in Arizona?
Of the 191 Arizona places with at least one community water system on file, Ft Defiance ranks #2 by number of systems (83).
About This Data
Figures here are the current EPA SDWIS extract joined to the 83 community water systems whose service area lists Ft Defiance, ranked against the 191 Arizona places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.