Is Upper Moenkopi, AZ Tap Water Safe to Drink?
Graded B-, with 5 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
74.7/100
waterverge.com Upper Moenkopi, AZ — Water Quality Report
Upper Moenkopi's drinking water received a grade of B- (74.7 out of 100), indicating fair water quality. The city's 1 water system serves approximately 1,740 residents using groundwater.
Lead levels were measured at 5.0 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 312 violations on record, including 8 health-based violations. 5 remain unresolved.
What to know about Upper Moenkopi's water
Upper Moenkopi ranks #137 out of 292 cities in Arizona for water quality, placing it mid-range in the state.
Upper Moenkopi 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, Upper Moenkopi may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Upper Moenkopi, AZ water safe to drink?
Upper Moenkopi's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (74.7/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,740 residents using groundwater (wells).
Recent water quality updates for Upper Moenkopi
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Upper Moenkopi's water quality assessment. Grade: B- (74.7/100).
Contaminants: Chlorine.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Federal disaster declaration (FEMA DR-4620). Flood event — may have impacted local water infrastructure.
Contaminants: Toluene.
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 Upper Moenkopi's water supply.
Well within EPA limits.
Violation history
Upper Moenkopi's water system has 312 total violations on record, including 8 health-based violations. 5 remain unresolved. 3 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 Upper Moenkopi's water come from?
Upper Moenkopi's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,740 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 Upper Moenkopi residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Upper Moenkopi'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Upper Moenkopi'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. | 5.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Upper Moenkopi compares by contaminant
Explore where Upper Moenkopi ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Upper Moenkopi's water comes from
Upper Moenkopi'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 native american ownership and serves approximately 1,740 people through 1 water system.
Water bodies near Upper Moenkopi
Upper Moenkopi is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Upper Moenkopi
| System Name | PWSID | Population | Source |
|---|---|---|---|
| Upper Moenkopi | 090400104 | 1,740 | GW |
How Upper Moenkopi compares
Full Arizona rankings →Upper Moenkopi's score of 74.7/100 is above the average of 42/100 among major Arizona cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Arizona rankings →About Upper Moenkopi, 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 Upper Moenkopi's water quality findings.
Frequently asked questions
Is Upper Moenkopi, AZ tap water safe to drink?
Upper Moenkopi's water quality earned a grade of B- (74.7/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #137 out of 292 cities tested in Arizona.
What contaminants are in Upper Moenkopi's water?
Lead was measured at 5.0 ppb (90th percentile). 312 violations are on record.
How is Upper Moenkopi'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 Upper Moenkopi?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Upper Moenkopi's water come from?
Upper Moenkopi's water is sourced from Groundwater. The city has 1 water system serving approximately 1,740 residents.
What health violations has Upper Moenkopi's water system had?
Upper Moenkopi has 8 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 5 violations remain unresolved.
Is Upper Moenkopi's groundwater at risk of contamination?
Upper Moenkopi 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 312 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 Upper Moenkopi's water compare to other cities?
Upper Moenkopi ranks #137 out of 292 cities in Arizona (better than 53% of state cities) and #9774 out of 15744 cities nationally (38th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Upper Moenkopi's small water system affect quality?
Upper Moenkopi's system serves approximately 1,740 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 312 violations on record.