Is Fort Defiance, AZ Tap Water Safe to Drink?
Fort Defiance tap water meets federal Safe Drinking Water Act standards but 1 of 1 ZIP code show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.
Where Does Fort Defiance Get Its Water?
Water in Fort Defiance, AZ is provided by 11 public water systems: Fort Defiance-Window Rock-St Michaels NTUA, Crownpoint-Littlewater-Three Mile Point NTUA, Tuba City NTUA, Chinle-Many Farms-Del Muerto NTUA, Dilkon-Indian Wells-Greasewood-White Cone NTUA, Farmington Rural-Shiprock-Beclabito NTUA, Ganado-Burnside-Cornfield-Steamboat NTUA, Kayenta NTUA, Mariano Lake-Pinedale-Church Rock NTUA, Pinon-District 4 NTUA and Toadlena NTUA.
How Is Fort Defiance Tap Water Treated?
Treated water is disinfected using chloramines. Treatment includes groundwater disinfection.
What's in Fort Defiance Tap Water?
The following contaminants were detected most frequently in Fort Defiance public water systems. 1 of 1 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 230 µg/L | 10 µg/L | 1 ZIP | Above guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 8:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Fort Defiance
Based on EPA monitoring data, 1 of 1 ZIP codes in Fort Defiance have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.
Best Filters for PFAS Water Profile
PFAS compounds are detected in this water supply. A reverse osmosis (RO) system or an activated-carbon filter specifically certified under NSF/ANSI P473 is required for reliable PFAS reduction. Standard pitcher and faucet filters without P473 certification do not remove PFAS.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Fort Defiance Tap Water
Is Fort Defiance tap water safe to drink?
Fort Defiance tap water meets Safe Drinking Water Act requirements but 1 of 1 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.
What contaminants are in Fort Defiance tap water?
The most commonly detected contaminants in Fort Defiance water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Fort Defiance get its drinking water?
Fort Defiance receives water from 11 public water systems, including Fort Defiance-Window Rock-St Michaels NTUA.
Do I need a water filter in Fort Defiance?
If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.
How often is Fort Defiance tap water tested?
Public water systems in Fort Defiance are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-08-18.
Tap water reports by ZIP in Fort Defiance
- 86504 - Fort Defiance tap water report Higher concern
Water utilities serving Fort Defiance, AZ
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- TORREON-OJO ENCINO EAST - NTUANo recent federal sampling
- TSEHOOTSOOI MIDDLE SCHOOLNo recent federal sampling
Also covers / overlaps with
- Fort Defiance CCD, AZ · Township
- Sawmill, AZ · CDP