Is Oljeto, AZ Tap Water Safe to Drink?
Graded A, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
92.4/100
waterverge.com Oljeto, AZ — Water Quality Report
Oljeto's drinking water received a grade of A (92.4 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,276 residents using groundwater.
Lead levels were measured at 1.0 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 34 violations on record, including 2 health-based violations. 3 remain unresolved.
What to know about Oljeto's water
Oljeto ranks #26 out of 292 cities in Arizona for water quality, placing it one of the best in the state.
Oljeto 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, Oljeto may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Oljeto, AZ water safe to drink?
Oljeto's drinking water has significant quality concerns based on EPA testing data. With a grade of A (92.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,276 residents using groundwater (wells).
Recent water quality updates for Oljeto
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Oljeto's water quality assessment. Grade: A (92.4/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: Revised Total Coliform Rule.
Contaminants: Stage 2 Disinfectants and Disinfection Byproducts Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Oljeto's water supply.
Well within EPA limits.
Violation history
Oljeto's water system has 34 total violations on record, including 2 health-based violations. 3 remain unresolved.
Where does Oljeto's water come from?
Oljeto's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,276 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Oljeto residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Oljeto'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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Oljeto compares by contaminant
Explore where Oljeto ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Oljeto's water comes from
Oljeto'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 1,276 people through 1 water system.
Water systems serving Oljeto
| System Name | PWSID | Population | Source |
|---|---|---|---|
| Oljato NTUA | NN4900224 | 1,276 | GW |
How Oljeto compares
Full Arizona rankings →Oljeto's score of 92.4/100 is above the average of 42/100 among major Arizona cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Arizona rankings →Learn more about your water
Guides and resources related to Oljeto's water quality findings.
Frequently asked questions
Is Oljeto, AZ tap water safe to drink?
Oljeto's water quality earned a grade of A (92.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #26 out of 292 cities tested in Arizona.
What contaminants are in Oljeto's water?
Lead was measured at 1.0 ppb (90th percentile). 34 violations are on record.
How is Oljeto'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 Oljeto?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Oljeto's water come from?
Oljeto's water is sourced from Groundwater. The city has 1 water system serving approximately 1,276 residents.
What health violations has Oljeto's water system had?
Oljeto has 2 health-based violations on record. The most recent violation was recorded in January 2020. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Oljeto's groundwater at risk of contamination?
Oljeto 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 34 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 Oljeto's water compare to other cities?
Oljeto ranks #26 out of 292 cities in Arizona (better than 91% of state cities) and #1258 out of 15744 cities nationally (92th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Oljeto's small water system affect quality?
Oljeto's system serves approximately 1,276 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 34 violations on record.