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Community Water System · PWS AZ0411018

Mammoth Town Of

Mammoth, Arizona 85618 - drinking water served from groundwater sources to 1,181 people, tracked in EPA SDWIS and UCMR5.

1,181
People served
153
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 153 drinking-water violations at Mammoth Town Of, 1% of them health-based - below the Arizona per-system average.

153
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
1,181
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mammoth Town Of

Mammoth Town Of is a local-owned community water system that delivers drinking water to 1,181 residents in Mammoth, Arizona (Pinal County) through 539 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 153 total violations for this system , of which 2 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 107 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 38 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Arizona, EPA tracks 1,493 public water systems serving 7,322,166 people, with 228,944 cumulative violations and 15,663 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 153.3 violations. Statewide, 145 of 152 UCMR5-tested systems have reported PFAS detections (95.4%).

Mammoth Town Of's 153 violations sit below the Arizona average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,181
Total Violations
153
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
539
County
Pinal
School/Daycare
No
MCL Violations
2
Monitoring Violations
107
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 38 2014
Chlorine MR 23 2024
Consumer Confidence Rule Other 20 2023
Fluoride MR 10 2000
TTHM MR 10 2024
Total Haloacetic Acids (HAA5) MR 10 2024
Nitrate MR 6 2005
Lead and Copper Rule MR 3 2004
Revised Total Coliform Rule RPT 2 2017
Fluoride MCL 2 1980
Mercury MR 1 1988
Cadmium MR 1 1988
Gross Alpha, Excl. Radon and U MR 1 1980
Barium MR 1 1988
Chromium MR 1 1988
Arsenic MR 1 1985
Selenium MR 1 1988

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Mammoth Town Of.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID AZ0411018 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Arizona Drinking Water Authority

Arizona DEQ, Drinking Water Program is the primacy agency that licenses and inspects Mammoth Town Of under EPA-delegated authority.

Open AZ regulator portal

Source: Arizona DEQ, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Chlorine MR 23 SDWIS / AZ0411018 / 0999
2024 TTHM MR 10 SDWIS / AZ0411018 / 2950
2024 Total Haloacetic Acids (HAA5) MR 10 SDWIS / AZ0411018 / 2456
2023 Consumer Confidence Rule Other 20 SDWIS / AZ0411018 / 7000
2017 Revised Total Coliform Rule RPT 2 SDWIS / AZ0411018 / 8000
2014 Coliform (TCR) MR 38 SDWIS / AZ0411018 / 3100
2005 Nitrate MR 6 SDWIS / AZ0411018 / 1040
2004 Lead and Copper Rule MR 3 SDWIS / AZ0411018 / 5000
2000 Fluoride MR 10 SDWIS / AZ0411018 / 1025
1988 Mercury MR 1 SDWIS / AZ0411018 / 1035
1988 Cadmium MR 1 SDWIS / AZ0411018 / 1015
1988 Barium MR 1 SDWIS / AZ0411018 / 1010
1988 Chromium MR 1 SDWIS / AZ0411018 / 1020
1988 Selenium MR 1 SDWIS / AZ0411018 / 1045
1985 Arsenic MR 1 SDWIS / AZ0411018 / 1005

How Mammoth Town Of Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Mammoth Town Of Arizona avg Federal benchmark
Total violations 153 153.3 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 10.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 95.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,181 4,904 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,493 regulated public water systems in Arizona.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Mammoth Town Of water safe to drink? ▼
Mammoth Town Of (PWS ID: AZ0411018) has 153 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,181 people using Groundwater sources.
How many people does Mammoth Town Of serve? ▼
Mammoth Town Of serves 1,181 people in Mammoth, Arizona. It is a Local-owned system using Groundwater water sources with 539 service connections.
What type of violations does Mammoth Town Of have? ▼
Mammoth Town Of has 153 total violations: 2 health-based violations (MCL exceedances or treatment failures), 107 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mammoth Town Of water? ▼
No PFAS testing data is available for Mammoth Town Of under the EPA's UCMR5 monitoring program.
What water source does Mammoth Town Of use? ▼
Mammoth Town Of uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.