Is Tuba City Bia Boarding School, AZ Tap Water Safe to Drink?
Graded A-, with 8 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
86.4/100
waterverge.com Tuba City Bia Boarding School, AZ — Water Quality Report
Tuba City Bia Boarding School's drinking water received a grade of A- (86.4 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,040 residents using groundwater.
Lead levels were measured at 1.5 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 29 violations on record, including 1 health-based violation. 8 remain unresolved.
What to know about Tuba City Bia Boarding School's water
Tuba City Bia Boarding School ranks #79 out of 292 cities in Arizona for water quality, placing it mid-range in the state.
Tuba City Bia Boarding School relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Tuba City Bia Boarding School may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Tuba City Bia Boarding School, AZ water safe to drink?
Tuba City Bia Boarding School's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (86.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,040 residents using groundwater (wells).
Recent water quality updates for Tuba City Bia Boarding School
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Tuba City Bia Boarding School's water quality assessment. Grade: A- (86.4/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Revised Total Coliform Rule.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-4620). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3241). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Tuba City Bia Boarding School's water supply.
Well within EPA limits.
Violation history
Tuba City Bia Boarding School's water system has 29 total violations on record, including 1 health-based violation. 8 remain unresolved. 4 violations were issued in the last 5 years.
Flood & environmental risk
Coconino County has experienced 6 federally declared disasters since 1970. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Moenkopi Wash.
Where does Tuba City Bia Boarding School's water come from?
Tuba City Bia Boarding School's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,040 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Moenkopi Wash (river).
What Tuba City Bia Boarding School residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Tuba City Bia Boarding School's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Tuba City Bia Boarding School's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Flood & disaster history
Coconino County has experienced 6 federally declared disasters since 1970. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.5 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Tuba City Bia Boarding School compares by contaminant
Explore where Tuba City Bia Boarding School ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Tuba City Bia Boarding School's water comes from
Tuba City Bia Boarding School's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by federal ownership and serves approximately 2,040 people through 1 water system.
Water bodies near Tuba City Bia Boarding School
Tuba City Bia Boarding School is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Tuba City Bia Boarding School
| System Name | PWSID | Population | Source |
|---|---|---|---|
| Tuba City Boarding School BIA | NN0433001 | 2,040 | GW |
How Tuba City Bia Boarding School compares
Full Arizona rankings →Tuba City Bia Boarding School's score of 86.4/100 is above the average of 42/100 among major Arizona cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Arizona rankings →About Tuba City Bia Boarding School, AZ
Wikipedia →Tuba City is an unincorporated town and census-designated place in Coconino County, Arizona, on the Navajo Nation, United States. It is the second-largest community in Coconino County. The population of the census-designated place (CDP) was 8,611 at the 2010 census.
Learn more about your water
Guides and resources related to Tuba City Bia Boarding School's water quality findings.
Frequently asked questions
Is Tuba City Bia Boarding School, AZ tap water safe to drink?
Tuba City Bia Boarding School's water quality earned a grade of A- (86.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #79 out of 292 cities tested in Arizona.
What contaminants are in Tuba City Bia Boarding School's water?
Lead was measured at 1.5 ppb (90th percentile). 29 violations are on record.
How is Tuba City Bia Boarding School's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Tuba City Bia Boarding School?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Tuba City Bia Boarding School's water come from?
Tuba City Bia Boarding School's water is sourced from Groundwater. The city has 1 water system serving approximately 2,040 residents.
What health violations has Tuba City Bia Boarding School's water system had?
Tuba City Bia Boarding School has 1 health-based violation on record. The most recent violation was recorded in January 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 8 violations remain unresolved.
Is Tuba City Bia Boarding School's groundwater at risk of contamination?
Tuba City Bia Boarding School uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 29 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Tuba City Bia Boarding School's water compare to other cities?
Tuba City Bia Boarding School ranks #79 out of 292 cities in Arizona (better than 73% of state cities) and #4713 out of 15744 cities nationally (70th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Tuba City Bia Boarding School's small water system affect quality?
Tuba City Bia Boarding School's system serves approximately 2,040 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 29 violations on record.