Public water system · 090400107

Active

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)

At a glance

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) (PWSID 090400107) is an active community water system in Arizona. It reports serving 609 people through 134 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 January 2026.

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

Population served

609

Service connections

134

Primary source

GWP

Purchased groundwater

System type

CWS

Community water system

System record

PWSID090400107

System typeCommunity water system

Activity statusActive

Population served609

Service connections134

Primary water sourcePurchased groundwater

Owner typeNative American

Primacy agencyEPA Region 09

City servedLower Sipaulovi, Lower Mishongnovi

StateArizona

ZIP—

County—

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

By EPA's size categories, Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) 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 Sipaulovi (Lower Sipaulovi/Lower 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 Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)?

EPA lists Sipaulovi (Lower Sipaulovi/Lower 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 Sipaulovi (Lower Sipaulovi/Lower 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 January 2026. The violations listed here began between April 2022 and January 2026. By type: 3 required treatment not met, 3 public notice, recordkeeping or other, 3 monitoring, 2 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Public Notice (3 of them). EPA lists 8 as resolved, 2 as unaddressed and 2 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
2026-01-21	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Unaddressed
2025-07-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2025-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2025-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Archived
2024-10-17	Required treatment not metLSL Inventory · code 2E	Lead and Copper Rule Revisionscode 5200	Yes	Unaddressed
2023-12-31	Required treatment not metFailure To Address Deficiency · code 45	Groundwater Rulecode 0700	Yes	Resolved
2023-04-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2023-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Archived
2023-03-01	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
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

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.

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

Who runs Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)?

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) (PWSID 090400107) is a community water system Native American-owned. It is regulated by the EPA Region 09.

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

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) reports serving 609 people through 134 service connections in Arizona.

Where does Sipaulovi (Lower Sipaulovi/Lower 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 Sipaulovi (Lower Sipaulovi/Lower 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 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 Sipaulovi (Lower Sipaulovi/Lower 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 January 2026. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 09.

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

As a community water system, Sipaulovi (Lower Sipaulovi/Lower 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, “Sipaulovi (Lower Sipaulovi/Lower Mishongnovi), PWSID 090400107, Arizona”, https://aquacensus.com/water-systems/arizona/sipaulovi-lower-sipaulovi-lower-mishongnovi-090400107 (data as of October 1, 2026).