Public water system · AZ0420423

Active

University of Arizona

At a glance

University of Arizona (PWSID AZ0420423) is an active non-transient non-community water system in Pima County, Arizona. It reports serving 50,000 people through 139 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2021.

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

Population served

50,000

Service connections

139

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDAZ0420423

System typeNon-transient non-community water system

Activity statusActive

Population served50,000

Service connections139

Primary water sourceGroundwater

Owner typeState government

Primacy agencyAZ state drinking water program

City servedTucson

StateArizona

ZIP—

CountyPima County

How does University of Arizona compare with other water systems in Pima County?

By EPA's size categories, University of Arizona is a large system (10,001 to 100,000 people). Pima County has 193 active public water systems, and University of Arizona is the 2nd-largest of them by population served. Its population served is about 8.5 times the county average of 5,896 people per system, and accounts for 4.4% of the 1,137,975 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so University of Arizona is about 116 times that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Arizona has 232 active non-transient non-community water systems, 13% 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 University of Arizona?

EPA lists University of Arizona as owned by a state 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. 5 of the 193 active systems in Pima County (2.6%) are also owned by a state government.

Does University of Arizona have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2021. The violations listed here began between November 2016 and October 2021. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (5 of them). EPA lists 12 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2021-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2021-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-11-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-11-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2020-01-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2019-10-31	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2018-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2018-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2018-05-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2018-05-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2017-01-01	Monitoring and reportingMonitoring, Regular · code 03	Di(2-ethylhexyl) phthalatecode 2039	No	Resolved
2016-11-01	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.

University of Arizona: frequently asked questions

Who runs University of Arizona?

University of Arizona (PWSID AZ0420423) is a non-transient non-community water system owned by a state government. It is regulated by the AZ state drinking water program.

How many people does University of Arizona serve?

University of Arizona reports serving 50,000 people through 139 service connections in Pima County, Arizona.

Where does University of Arizona 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 University of Arizona have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2021. 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 University of Arizona'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, none is health-based, and the most recent began in October 2021. For current results, consult EPA ECHO, or the AZ state drinking water program.

Where can I find University of Arizona's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. University of Arizona is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Pima County

Water system	County	Population served	Type	Source
Tucson City of	Pima	732,906	Community	Groundwater
Metropolitan Dwid	Pima	45,570	Community	Groundwater
Oro Valley Water Utility	Pima	42,316	Community	Groundwater
Community Wc of Green Valley	Pima	22,085	Community	Groundwater
Usaf Davis Monthan Afb	Pima	18,640	Community	Groundwater
Sahuarita Water Company	Pima	18,178	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, “University of Arizona, PWSID AZ0420423, Arizona”, https://aquacensus.com/water-systems/arizona/university-of-arizona-az0420423 (data as of October 1, 2026).