Public water system · AZ0411018
ActiveMammoth Town of
At a glance
Town of Mammoth (PWSID AZ0411018) is an active community water system in Pinal County, Arizona. It reports serving 1,181 people through 539 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,181
Service connections
539
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Town of Mammoth compare with other water systems in Pinal County?
By EPA's size categories, Town of Mammoth is a small system (501 to 3,300 people). Pinal County has 94 active public water systems. Its population served is well below the county average of 5,375 people per system, and accounts for 0.2% of the 505,241 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active community water system reports serving 6,703 people, so Town of Mammoth is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Arizona has 936 active community water systems, 53% of the state's 1,769 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,612 Arizona systems (91%) list groundwater as their primary source.
Who owns and regulates Town of Mammoth?
EPA lists Town of Mammoth as owned by a local government. The AZ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 13 of the 94 active systems in Pinal County (14%) are also owned by a local government.
Does Town of Mammoth have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2026. The violations listed here began between July 2023 and January 2026. By type: 6 monitoring and reporting, 4 public notice, recordkeeping or other, 1 required treatment not met and 1 reporting. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 9 as resolved and 3 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2026-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2025-12-01 | Required treatment not metPublic Education · code 65 | Lead and Copper Rulecode 5000 | Yes | Unaddressed |
| 2025-11-20 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-11-16 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2025-10-02 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2024-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2024-06-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2023-10-02 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
The 12 most recent violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Town of Mammoth: frequently asked questions
Who runs Town of Mammoth?
Town of Mammoth (PWSID AZ0411018) is a community water system owned by a local government. It is regulated by the AZ state drinking water program.
How many people does Town of Mammoth serve?
Town of Mammoth reports serving 1,181 people through 539 service connections in Pinal County, Arizona.
Where does Town of Mammoth get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Town of Mammoth have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2026. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Town of Mammoth's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the AZ state drinking water program.
Where can I find Town of Mammoth's water quality report?
As a community water system, Town of Mammoth must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Pinal County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Arizona Water Co - Pinal Valley | Pinal | 134,432 | Community | Groundwater |
| Epcor - San Tan | Pinal | 87,435 | Community | Groundwater |
| Gw Santa Cruz Water Co | Pinal | 84,000 | Community | Groundwater |
| Arizona Water Co - Apache Junction | Pinal | 62,055 | Community | Groundwater |
| Lago Del Oro Water Company | Pinal | 18,132 | Community | Groundwater |
| Florence Water Company | Pinal | 15,900 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Mammoth Town of, PWSID AZ0411018, Arizona”, https://aquacensus.com/water-systems/arizona/mammoth-town-of-az0411018 (data as of October 1, 2026).