States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400394

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)

Second Mesa, EPA Region 9 — Tribal Water Systems 86043 - drinking water served from groundwater sources to 490 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

490
People served: 454
EPA violations: 121
Health-based: Untested
UCMR5 result

The verdict

EPA records 454 drinking-water violations at Mishongnovi (Upper Sipaulovi/Upper Mishongnovi), 27% of them health-based.

454
Total EPA violations on record: 27%
Health-based (MCL / treatment failure): 490
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) is a native american-owned community water system that delivers drinking water to 490 residents in Second Mesa, EPA Region 9 — Tribal Water Systems through 41 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 454 total violations for this system , of which 121 (27%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 237 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Arsenic, recorded in 121 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 9 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served

490

Total Violations

454

Health-Based Violations

121

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Native American
Connections: 41
School/Daycare: No
MCL Violations: 121
Monitoring Violations: 237
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Arsenic	MCL	121	2022
Coliform (TCR)	MR	43	2015
Arsenic	MR	18	2016
Public Notice	Other	12	2016
Nitrate	MR	7	2013
Consumer Confidence Rule	Other	7	2010
Lead and Copper Rule	MR	6	2014
Fluoride	MR	4	2004
Barium	MR	3	2001
Cadmium	MR	3	2001
Chromium	MR	3	2001
Mercury	MR	3	2001
BHC-GAMMA	MR	3	2001
Methoxychlor	MR	3	2001
Toxaphene	MR	3	2001
Carbofuran	MR	3	2001
LASSO	MR	3	2001
2,3,7,8-TCDD	MR	3	2011
Heptachlor	MR	3	2001
2,4-D	MR	3	2001
2,4,5-TP	MR	3	2001
Pentachlorophenol	MR	3	2001
1,2,4-Trichlorobenzene	MR	3	2001
cis-1,2-Dichloroethylene	MR	3	2001
Total Polychlorinated Biphenyls (PCB)	MR	3	2001
1,2-DIBROMO-3-CHLOROPROPANE	MR	3	2001
ETHYLENE DIBROMIDE	MR	3	2001
Chlordane	MR	3	2001
DICHLOROMETHANE	MR	3	2001
o-Dichlorobenzene	MR	3	2001

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Mishongnovi (Upper Sipaulovi/Upper Mishongnovi).

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 090400394 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 9 — Tribal Water Systems Drinking Water Authority

EPA Region 9 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 09 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest)	Contaminant	Category	Count	EPA Record
2025	Revised Total Coliform Rule	MON	3	SDWIS / 090400394 / 8000
2025	Chlorine	MR	1	SDWIS / 090400394 / 0999
2022	Arsenic	MCL	121	SDWIS / 090400394 / 1005
2020	Revised Total Coliform Rule	RPT	1	SDWIS / 090400394 / 8000
2016	Arsenic	MR	18	SDWIS / 090400394 / 1005
2016	Public Notice	Other	12	SDWIS / 090400394 / 7500
2015	Coliform (TCR)	MR	43	SDWIS / 090400394 / 3100
2014	Lead and Copper Rule	MR	6	SDWIS / 090400394 / 5000
2013	Nitrate	MR	7	SDWIS / 090400394 / 1040
2013	Total Haloacetic Acids (HAA5)	MR	1	SDWIS / 090400394 / 2456
2013	TTHM	MR	1	SDWIS / 090400394 / 2950
2012	Asbestos	MR	2	SDWIS / 090400394 / 1094
2011	2,3,7,8-TCDD	MR	3	SDWIS / 090400394 / 2063
2010	Consumer Confidence Rule	Other	7	SDWIS / 090400394 / 7000
2004	Fluoride	MR	4	SDWIS / 090400394 / 1025

How Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric	Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)	EPA Region 9 — Tribal Water Systems avg	Federal benchmark
Total violations	454	-	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	121	-	Indicates a contaminant exceeded a federal MCL
PFAS detection	None	-	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	490	-	Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 9 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼

Contaminant	Federal MCL / Action Level	Note
Lead	0 mg/L (Action Level: 0.015 mg/L)	Lead and Copper Rule treatment technique
Arsenic	0.010 mg/L (10 ppb)	Health-based MCL since 2006
Total Coliform	Treatment technique (RTCR)	Indicator organism, monitoring trigger
PFOA / PFOS (PFAS)	4.0 ppt each (final 2024 rule)	Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N)	10 mg/L	Acute health risk for infants

Frequently Asked Questions

Is Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) water safe to drink? ▼

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) (PWS ID: 090400394) has 454 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 490 people using Groundwater sources.

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

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) serves 490 people in Second Mesa, EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 41 service connections.

What type of violations does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) have? ▼

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) has 454 total violations: 121 health-based violations (MCL exceedances or treatment failures), 237 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) water? ▼

No PFAS testing data is available for Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) under the EPA's UCMR5 monitoring program.

What water source does Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) use? ▼

Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.

Where does this data come from? ▼

All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.