Public water system · 090400394

Active

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)

At a glance

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) (PWSID 090400394) is an active community water system in Arizona. It reports serving 490 people through 41 service connections. Its primary water source is purchased groundwater, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in March 2026.

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

Population served

490

Service connections

Primary source

GWP

Purchased groundwater

System type

CWS

Community water system

System record

PWSID090400394

System typeCommunity water system

Activity statusActive

Population served490

Service connections41

Primary water sourcePurchased groundwater

Owner typeNative American

Primacy agencyEPA Region 09

City servedUpper Sipaulovi, Upper Mishongnovi

StateArizona

ZIP—

County—

How does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) compare with other water systems in Arizona?

By EPA's size categories, Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) is a very small system (500 people or fewer). 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 Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) 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 groundwater means the system buys groundwater from another public water system rather than drawing its own. 71 Arizona systems (4%) list purchased groundwater as their primary source.

Who owns and regulates Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)?

EPA lists Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) as Native American-owned. The EPA Region 09 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) have drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in March 2026. The violations listed here began between October 2021 and March 2026. By type: 4 monitoring, 4 contaminant level above the legal limit, 2 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 8 as resolved, 3 as archived 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. 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. 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
2026-03-05	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Unaddressed
2025-12-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2025-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Archived
2025-07-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2025-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Archived
2025-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Archived
2023-03-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2022-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2022-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2022-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	Resolved
2021-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Arseniccode 1005	Yes	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.

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi): frequently asked questions

Who runs Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)?

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) (PWSID 090400394) is a community water system Native American-owned. It is regulated by the EPA Region 09.

How many people does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) serve?

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) reports serving 490 people through 41 service connections in Arizona.

Where does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) get its water?

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

Does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) have any drinking water violations?

Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in March 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 Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)'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, 5 are health-based, and the most recent began in March 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 09.

Where can I find Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)'s water quality report?

As a community water system, Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) 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, “Mishongnovi (Upper Sipaulovi/Upper Mishongnovi), PWSID 090400394, Arizona”, https://aquacensus.com/water-systems/arizona/mishongnovi-upper-sipaulovi-upper-mishongnovi-090400394 (data as of October 1, 2026).