Public water system · NN0400399

Active

Sweetwater NTUA

At a glance

Sweetwater NTUA (PWSID NN0400399) is an active community water system in Arizona. It reports serving 2,014 people through 589 service connections. Its primary water source is purchased surface water, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in July 2025.

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

Population served

2,014

Service connections

589

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDNN0400399

System typeCommunity water system

Activity statusActive

Population served2,014

Service connections589

Primary water sourcePurchased surface water

Owner typeNative American

Primacy agencyNN state drinking water program

City servedSweetwater, Red Mesa

StateArizona

ZIP—

County—

How does Sweetwater NTUA compare with other water systems in Arizona?

By EPA's size categories, Sweetwater NTUA is a small system (501 to 3,300 people). 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 Sweetwater 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. Arizona has 936 active community water systems, 53% of the state's 1,769 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 22 Arizona systems (1.2%) list purchased surface water as their primary source.

Who owns and regulates Sweetwater NTUA?

EPA lists Sweetwater 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 Sweetwater NTUA have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in July 2025. The violations listed here began between October 2020 and July 2025. By type: 6 contaminant level above the legal limit, 5 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Arsenic (7 of them). EPA lists 9 as resolved, 2 as unaddressed and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2025-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Archived
2024-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2024-04-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2024-01-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Unaddressed
2024-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2023-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2023-10-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2023-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2022-01-01	Monitoring and reportingMonitoring, Regular · code 03	Arseniccode 1005	No	Resolved
2021-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2021-01-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2020-10-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	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.

Sweetwater NTUA: frequently asked questions

Who runs Sweetwater NTUA?

Sweetwater NTUA (PWSID NN0400399) is a community water system Native American-owned. It is regulated by the NN state drinking water program.

How many people does Sweetwater NTUA serve?

Sweetwater NTUA reports serving 2,014 people through 589 service connections in Arizona.

Where does Sweetwater NTUA get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does Sweetwater NTUA have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in July 2025. 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 Sweetwater 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, 6 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the NN state drinking water program.

Where can I find Sweetwater NTUA's water quality report?

As a community water system, Sweetwater 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 Arizona

Water system	County	Population served	Type	Source
Phoenix City of	Maricopa	1,695,000	Community	Surface water
Tucson City of	Pima	732,906	Community	Groundwater
Mesa City of	Maricopa	466,000	Community	Surface water
Gilbert, Town of	Maricopa	247,600	Community	Surface water
Chandler City of	Maricopa	247,328	Community	Surface water
Scottsdale City of	Maricopa	241,361	Community	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, “Sweetwater NTUA, PWSID NN0400399, Arizona”, https://aquacensus.com/water-systems/arizona/sweetwater-ntua-nn0400399 (data as of October 1, 2026).