A84/100
Inscription House-Navajo Mountain NTUA — Water Quality Report 2026
Serving 1,368 people · Arizona
Water Source
Groundwater
County
—
System ID
NN0400283
Violations
9
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 2016.
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 Inscription House-Navajo Mountain NTUA
Is Inscription House-Navajo Mountain NTUA water safe to drink?
Inscription House-Navajo Mountain NTUA water receives a grade of A (84/100), which is considered excellent. 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 Inscription House-Navajo Mountain NTUA detected?
1 contaminants were tested in Inscription House-Navajo Mountain NTUA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does Inscription House-Navajo Mountain NTUA have any EPA violations?
Yes, Inscription House-Navajo Mountain NTUA has 9 EPA violation(s) on record, with the most recent in 2016. Violation types include Other, MR, MCL. 1 are health-based violations.
How many people does Inscription House-Navajo Mountain NTUA serve?
Inscription House-Navajo Mountain NTUA serves approximately 1,368 people, Arizona. The system provides water to 1 community: Inscription House, Broad Mesa West, Dry.
What type of water does Inscription House-Navajo Mountain NTUA provide?
Inscription House-Navajo Mountain NTUA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NN0400283.
How does Inscription House-Navajo Mountain NTUA compare to other utilities in Arizona?
Inscription House-Navajo Mountain NTUA scores 84/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Arizona state page for a full comparison of water systems.