TapSafetyReport
F0/100

MAMMOTH TOWN OF — Water Quality Report 2026

Serving 1,181 people · Arizona

Water Source
Groundwater
County
—
System ID
AZ0411018
Violations
97

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Lead (90th percentile)
0.019 mg/L0.015 mg/LOver Limit

EPA Violation History

7

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: June 1, 2024 – June 30, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: October 2, 2023 – April 9, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: October 2, 2021 – October 7, 2021Enforcement: Resolving — corrective action underway

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 MAMMOTH TOWN OF

Is MAMMOTH TOWN OF water safe to drink?

MAMMOTH TOWN OF water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 97 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has MAMMOTH TOWN OF detected?

1 contaminants were tested in MAMMOTH TOWN OF's water. Notable contaminants include Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).

Does MAMMOTH TOWN OF have any EPA violations?

Yes, MAMMOTH TOWN OF has 97 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, Other, RPT. 2 are health-based violations.

How many people does MAMMOTH TOWN OF serve?

MAMMOTH TOWN OF serves approximately 1,181 people, Arizona. The system provides water to 1 community: Mammoth.

What type of water does MAMMOTH TOWN OF provide?

MAMMOTH TOWN OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is AZ0411018.

How does MAMMOTH TOWN OF compare to other utilities in Arizona?

MAMMOTH TOWN OF scores 0/100 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.

Cities Served

Mammoth