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States → EPA Region 9 — Tribal Water Systems

Community Water System · PWS 090400107

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi)

EPA Region 9 — Tribal Water Systems - drinking water served from groundwater sources to 609 people, tracked in EPA SDWIS and UCMR5.

609
People served
391
EPA violations
124
Health-based
Untested
UCMR5 result

The verdict

EPA records 391 drinking-water violations at Sipaulovi (Lower Sipaulovi/Lower Mishongnovi), 32% of them health-based.

391
Total EPA violations on record
32%
Health-based (MCL / treatment failure)
609
People served by this system
N/A
PFAS compounds detected (UCMR5)

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

Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) is a native american-owned community water system that delivers drinking water to 609 residents in EPA Region 9 — Tribal Water Systems through 134 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 391 total violations for this system , of which 124 (32%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 214 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
609
Total Violations
391
Health-Based Violations
124
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
134
School/Daycare
No
MCL Violations
121
Monitoring Violations
214
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 121 2022
Coliform (TCR) MR 26 2008
Arsenic MR 14 2016
Public Notice Other 12 2023
Nitrate MR 6 2013
BHC-GAMMA MR 4 2011
Methoxychlor MR 4 2011
Toxaphene MR 4 2011
Carbofuran MR 4 2011
Atrazine MR 4 2011
LASSO MR 4 2011
Heptachlor MR 4 2011
Heptachlor epoxide MR 4 2011
2,4-D MR 4 2011
2,4,5-TP MR 4 2011
Pentachlorophenol MR 4 2011
Total Polychlorinated Biphenyls (PCB) MR 4 2011
1,2-DIBROMO-3-CHLOROPROPANE MR 4 2011
ETHYLENE DIBROMIDE MR 4 2011
Chlordane MR 4 2011
2,3,7,8-TCDD MR 3 2011
Revised Total Coliform Rule MON 3 2025
Consumer Confidence Rule Other 3 2008
Barium MR 2 2011
Cadmium MR 2 2011
CYANIDE MR 2 2011
Fluoride MR 2 2011
Mercury MR 2 2011
Selenium MR 2 2011
Antimony, Total MR 2 2011

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 Sipaulovi (Lower Sipaulovi/Lower 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 090400107 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 / 090400107 / 8000
2025 Chlorine MR 2 SDWIS / 090400107 / 0999
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / 090400107 / 5200
2023 Public Notice Other 12 SDWIS / 090400107 / 7500
2023 Groundwater Rule TT 1 SDWIS / 090400107 / 0700
2022 Arsenic MCL 121 SDWIS / 090400107 / 1005
2020 Revised Total Coliform Rule RPT 1 SDWIS / 090400107 / 8000
2016 Arsenic MR 14 SDWIS / 090400107 / 1005
2013 Nitrate MR 6 SDWIS / 090400107 / 1040
2013 Total Haloacetic Acids (HAA5) MR 1 SDWIS / 090400107 / 2456
2013 TTHM MR 1 SDWIS / 090400107 / 2950
2011 BHC-GAMMA MR 4 SDWIS / 090400107 / 2010
2011 Methoxychlor MR 4 SDWIS / 090400107 / 2015
2011 Toxaphene MR 4 SDWIS / 090400107 / 2020
2011 Carbofuran MR 4 SDWIS / 090400107 / 2046

How Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) Compares

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

Metric Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) EPA Region 9 — Tribal Water Systems avg Federal benchmark
Total violations 391 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 124 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 609 - 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 Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) water safe to drink? ▼
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) (PWS ID: 090400107) has 391 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 609 people using Groundwater sources.
How many people does Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) serve? ▼
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) serves 609 people in EPA Region 9 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 134 service connections.
What type of violations does Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) have? ▼
Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) has 391 total violations: 124 health-based violations (MCL exceedances or treatment failures), 214 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) water? ▼
No PFAS testing data is available for Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) under the EPA's UCMR5 monitoring program.
What water source does Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) use? ▼
Sipaulovi (Lower Sipaulovi/Lower 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.