C52/100
Tohatchi-Mexican Springs-Twin Lakes NTUA — Water Quality Report 2026
Serving 1,669 people · Arizona
Water Source
Groundwater
County
—
System ID
NN3500237
Violations
41
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 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 Tohatchi-Mexican Springs-Twin Lakes NTUA
Is Tohatchi-Mexican Springs-Twin Lakes NTUA water safe to drink?
Tohatchi-Mexican Springs-Twin Lakes NTUA water receives a grade of C (52/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 41 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has Tohatchi-Mexican Springs-Twin Lakes NTUA detected?
1 contaminants were tested in Tohatchi-Mexican Springs-Twin Lakes NTUA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Tohatchi-Mexican Springs-Twin Lakes NTUA have any EPA violations?
Yes, Tohatchi-Mexican Springs-Twin Lakes NTUA has 41 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, Other, MCL. 1 are health-based violations.
How many people does Tohatchi-Mexican Springs-Twin Lakes NTUA serve?
Tohatchi-Mexican Springs-Twin Lakes NTUA serves approximately 1,669 people, Arizona. The system provides water to 1 community: Tohatchi, Mexican Springs.
What type of water does Tohatchi-Mexican Springs-Twin Lakes NTUA provide?
Tohatchi-Mexican Springs-Twin Lakes NTUA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NN3500237.
How does Tohatchi-Mexican Springs-Twin Lakes NTUA compare to other utilities in Arizona?
Tohatchi-Mexican Springs-Twin Lakes NTUA scores 52/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Arizona state page for a full comparison of water systems.