F18/100
Sanostee-Tocito NTUA — Water Quality Report 2026
Serving 1,953 people · Arizona
Water Source
Groundwater
County
—
System ID
NN3503059
Violations
79
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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
Frequently Asked Questions About Sanostee-Tocito NTUA
Is Sanostee-Tocito NTUA water safe to drink?
Sanostee-Tocito NTUA water receives a grade of F (18/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 79 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has Sanostee-Tocito NTUA detected?
1 contaminants were tested in Sanostee-Tocito NTUA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Sanostee-Tocito NTUA have any EPA violations?
Yes, Sanostee-Tocito NTUA has 79 EPA violation(s) on record, with the most recent in 2020. Violation types include MR.
How many people does Sanostee-Tocito NTUA serve?
Sanostee-Tocito NTUA serves approximately 1,953 people, Arizona. The system provides water to 1 community: Sanostee, Tocito, Littlewater, Mittenroc.
What type of water does Sanostee-Tocito NTUA provide?
Sanostee-Tocito NTUA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NN3503059.
How does Sanostee-Tocito NTUA compare to other utilities in Arizona?
Sanostee-Tocito NTUA scores 18/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Arizona state page for a full comparison of water systems.