B63/100
Tonalea-Red Lake NTUA — Water Quality Report 2026
Serving 1,146 people · Arizona
Water Source
Groundwater
County
—
System ID
NN0400379
Violations
30
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 Tonalea-Red Lake NTUA
Is Tonalea-Red Lake NTUA water safe to drink?
Tonalea-Red Lake NTUA water receives a grade of B (63/100), which is considered good. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has Tonalea-Red Lake NTUA detected?
1 contaminants were tested in Tonalea-Red Lake NTUA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Tonalea-Red Lake NTUA have any EPA violations?
Yes, Tonalea-Red Lake NTUA has 30 EPA violation(s) on record, with the most recent in 2020. Violation types include MR, MCL. 1 are health-based violations.
How many people does Tonalea-Red Lake NTUA serve?
Tonalea-Red Lake NTUA serves approximately 1,146 people, Arizona. The system provides water to 1 community: Tonalea, Red Lake.
What type of water does Tonalea-Red Lake NTUA provide?
Tonalea-Red Lake NTUA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NN0400379.
How does Tonalea-Red Lake NTUA compare to other utilities in Arizona?
Tonalea-Red Lake NTUA scores 63/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Arizona state page for a full comparison of water systems.