Public water system · NN4903032

Active

Mexican Hat NTUA

At a glance

Mexican Hat NTUA (PWSID NN4903032) is an active community water system in Utah. It reports serving 239 people through 70 service connections. Its primary water source is groundwater, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2020.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

239

Service connections

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDNN4903032

System typeCommunity water system

Activity statusActive

Population served239

Service connections70

Primary water sourceGroundwater

Owner typeNative American

Primacy agencyNN state drinking water program

City servedHalchita-Mexican Hat

StateUtah

ZIP—

County—

How does Mexican Hat NTUA compare with other water systems in Utah?

By EPA's size categories, Mexican Hat NTUA is a very small system (500 people or fewer). Across Utah, the 1,133 active systems average 3,458 people each. Nationally, the average active community water system reports serving 6,703 people, so Mexican Hat NTUA 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. Utah has 540 active community water systems, 48% of the state's 1,133 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 898 Utah systems (79%) list groundwater as their primary source.

Who owns and regulates Mexican Hat NTUA?

EPA lists Mexican Hat NTUA as Native American-owned. The NN state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Mexican Hat NTUA have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2020. The violations listed here began between January 2010 and January 2020. By type: 9 monitoring and reporting, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 11 as resolved and 1 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
2020-01-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-01-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Haloacetic acids (HAA5)code 2456	No	Resolved
2016-04-01	Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A	Revised Total Coliform Rulecode 8000	No	Unaddressed
2012-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2012-11-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2011-11-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2011-09-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2011-01-01	Monitoring and reportingMonitoring, Regular · code 03	2,3,7,8-TCDD (dioxin)code 2063	No	Resolved
2011-01-01	Monitoring and reportingMonitoring, Regular · code 03	Polychlorinated biphenyls (PCBs), totalcode 2383	No	Resolved
2010-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Fluoridecode 1025	Yes	Resolved
2010-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2010-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	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.

Mexican Hat NTUA: frequently asked questions

Who runs Mexican Hat NTUA?

Mexican Hat NTUA (PWSID NN4903032) is a community water system Native American-owned. It is regulated by the NN state drinking water program.

How many people does Mexican Hat NTUA serve?

Mexican Hat NTUA reports serving 239 people through 70 service connections in Utah.

Where does Mexican Hat NTUA 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 Mexican Hat NTUA have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2020. 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 Mexican Hat NTUA'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, 2 are health-based, and the most recent began in January 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the NN state drinking water program.

Where can I find Mexican Hat NTUA's water quality report?

As a community water system, Mexican Hat NTUA 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 Utah

Water system	County	Population served	Type	Source
Salt Lake City Water System	Salt Lake	383,612	Community	Surface water
Granger-Hunter Improvement District	Salt Lake	121,083	Community	Purchased surface water
West Jordan City Water System	Salt Lake	117,025	Community	Purchased surface water
Provo City	Utah	116,288	Community	Purchased surface water
St George City Water System	Washington	105,240	Community	Purchased surface water
Sandy City Water System	Salt Lake	99,750	Community	Purchased surface water

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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, “Mexican Hat NTUA, PWSID NN4903032, Utah”, https://aquacensus.com/water-systems/utah/mexican-hat-ntua-nn4903032 (data as of October 1, 2026).