D32/100
Ft Defiance Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 99,744 residents · Arizona
What's In Ft Defiance's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: February 1, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: February 1, 2024 – February 29, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
Chinle-Many Farms-Del Muerto NTUA
Population Served
8,458
Water Source
Groundwater
System ID
NN0400174
Houck-Querino Canyon NTUA
Population Served
1,023
Water Source
Groundwater
System ID
NN0400280
Inscription House-Navajo Mountain NTUA
Population Served
1,368
Water Source
Groundwater
System ID
NN0400283
Chilchinbeto NTUA
Population Served
1,276
Water Source
Groundwater
System ID
NN0400290
Dennehotso NTUA
Population Served
1,040
Water Source
Groundwater
System ID
NN0400296
Shonto Junction NTUA
Population Served
1,146
Water Source
Groundwater
System ID
NN0400326
Kaibeto NTUA
Population Served
1,590
Water Source
Groundwater
System ID
NN0400348
Tonalea-Red Lake NTUA
Population Served
1,146
Water Source
Groundwater
System ID
NN0400379
Sweetwater NTUA
Population Served
2,014
Water Source
Purchased Surface Water
System ID
NN0400399
Fort Defiance-Window Rock-St Michaels NTUA
Population Served
12,869
Water Source
Groundwater
System ID
NN0403000
Ganado-Burnside-Cornfield-Steamboat NTUA
Population Served
3,947
Water Source
Groundwater
System ID
NN0403001
Kayenta NTUA
Population Served
3,844
Water Source
Groundwater
System ID
NN0403003
Pinon-District 4 NTUA
Population Served
5,195
Water Source
Groundwater
System ID
NN0403004
Tsaile-Dine College NTUA
Population Served
1,190
Water Source
Groundwater
System ID
NN0403005
LeChee NTUA
Population Served
1,115
Water Source
Purchased Surface Water
System ID
NN0403006
Cottonwood-Tselani NTUA
Population Served
1,334
Water Source
Purchased Groundwater
System ID
NN0403021
Leupp-Birdsprings-Tolani Lake NTUA
Population Served
2,100
Water Source
Groundwater
System ID
NN0403033
Lukachukai NTUA
Population Served
1,659
Water Source
Groundwater
System ID
NN0403047
Rock Point NTUA
Population Served
1,029
Water Source
Groundwater
System ID
NN0403048
Jeddito NTUA
Population Served
1,105
Water Source
Groundwater
System ID
NN0403100
New Lands NTUA
Population Served
1,905
Water Source
Groundwater
System ID
NN0403102
Mariano Lake-Pinedale-Church Rock NTUA
Population Served
4,562
Water Source
Groundwater
System ID
NN3500211
Tohatchi-Mexican Springs-Twin Lakes NTUA
Population Served
1,669
Water Source
Groundwater
System ID
NN3500237
Farmington Rural-Shiprock-Beclabito NTUA
Population Served
15,233
Water Source
Purchased Surface Water
System ID
NN3500245
Twin Lakes NTUA
Population Served
1,833
Water Source
Groundwater
System ID
NN3500261
Naschitti-Bisola NTUA
Population Served
1,173
Water Source
Groundwater
System ID
NN3500268
Defiance NTUA
Population Served
1,659
Water Source
Groundwater
System ID
NN3500277
Bread Springs-Chichiltah NTUA
Population Served
2,066
Water Source
Groundwater
System ID
NN3500292
Thoreau West-John Willie Camp-Baca NTUA
Population Served
1,611
Water Source
Groundwater
System ID
NN3500303
Red Rock NTUA
Population Served
1,652
Water Source
Groundwater
System ID
NN3500335
Crownpoint-Littlewater-Three Mile Point NTUA
Population Served
3,950
Water Source
Groundwater
System ID
NN3503039
Ojo Encino North NTUA
Population Served
1,108
Water Source
Purchased Surface Water
System ID
NN3503041
Sanostee-Tocito NTUA
Population Served
1,953
Water Source
Groundwater
System ID
NN3503059
Carson-Huerfano NTUA
Population Served
1,142
Water Source
Purchased Surface Water
System ID
NN3503063
Aneth NTUA
Population Served
1,481
Water Source
Groundwater
System ID
NN4900220
Oljato NTUA
Population Served
1,276
Water Source
Groundwater
System ID
NN4900224
Red Mesa NTUA
Population Served
1,023
Water Source
Purchased Surface Water
System ID
NN4903017
Frequently Asked Questions About Ft Defiance Water
Is Ft Defiance tap water safe to drink?
Ft Defiance, Arizona tap water receives a grade of D (32/100), which is considered poor. 1 contaminant(s) exceed EPA maximum contaminant levels and 2191 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Ft Defiance's water?
Of the 73 contaminants tested in Ft Defiance's water supply, the most notable include Copper (90th percentile), Lead (90th percentile), 1,4-dioxane. 1 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Ft Defiance have any water quality violations?
Yes, Ft Defiance has 2191 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, TT, Other. 183 of these are health-based violations, which are the most serious category.
Do I need a water filter in Ft Defiance?
Based on EPA data, using a water filter in Ft Defiance is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Ft Defiance's tap water come from?
Ft Defiance's drinking water is sourced from groundwater and supplied by Chinle-Many Farms-Del Muerto NTUA and 36 other water system(s). The system serves approximately 99,744 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Ft Defiance's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Ft Defiance's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Ft Defiance's water compare to other cities in Arizona?
Ft Defiance's water quality score of 32/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Arizona state page to see how all cities in the state compare.
What should I do if I'm concerned about Ft Defiance's water quality?
If you have concerns about Ft Defiance's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (Chinle-Many Farms-Del Muerto NTUA) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.