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Community Water System · PWS NN0433002

Chilchinbeto Community Day School BIA

Kayenta, Navajo Nation 86033 - drinking water served from groundwater sources to 138 people, tracked in EPA SDWIS and UCMR5.

138
People served
143
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 143 drinking-water violations at Chilchinbeto Community Day School BIA - below the Navajo Nation per-system average.

143
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
138
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Chilchinbeto Community Day School BIA

Chilchinbeto Community Day School BIA is a federal-owned community water system that delivers drinking water to 138 residents in Kayenta, Navajo Nation through 15 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 143 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 124 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is 2,3,7,8-TCDD, recorded in 6 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Navajo Nation, EPA tracks 170 public water systems serving 167,275 people, with 29,535 cumulative violations and 1,366 health-based violations on record. About 100% of systems in the state carry at least one violation, and state-wide the average per system is 173.7 violations. Statewide, 13 of 13 UCMR5-tested systems have reported PFAS detections (100%).

Chilchinbeto Community Day School BIA's 143 violations sit below the Navajo Nation average.

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
138
Total Violations
143
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Federal
Connections
15
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
124
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
2,3,7,8-TCDD MR 6 2008
Revised Total Coliform Rule RPT 4 2024
Lead and Copper Rule MR 4 2008
Consumer Confidence Rule Other 4 2006
Coliform (TCR) MR 3 2012
Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 2013
Revised Total Coliform Rule Other 3 2016
Methoxychlor MR 2 2004
Endothall MR 2 2004
Di(2-ethylhexyl) adipate MR 2 2004
Simazine MR 2 2004
Di(2-ethylhexyl) phthalate MR 2 2004
Picloram MR 2 2004
Dinoseb MR 2 2004
Hexachlorocyclopentadiene MR 2 2004
Aldicarb sulfoxide MR 2 2004
Atrazine MR 2 2004
LASSO MR 2 2004
Heptachlor MR 2 2004
Heptachlor epoxide MR 2 2004
HEXACHLOROBENZENE MR 2 2004
Benzo(a)pyrene MR 2 2004
Pentachlorophenol MR 2 2004
1,2,4-Trichlorobenzene MR 2 2004
cis-1,2-Dichloroethylene MR 2 2004
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2004
ETHYLENE DIBROMIDE MR 2 2004
o-Dichlorobenzene MR 2 2004
p-Dichlorobenzene MR 2 2004
Vinyl chloride MR 2 2004

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 Chilchinbeto Community Day School BIA.

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 NN0433002 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Navajo Nation Drinking Water Authority

Navajo Nation'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 NN 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
2024 Revised Total Coliform Rule RPT 4 SDWIS / NN0433002 / 8000
2016 Revised Total Coliform Rule Other 3 SDWIS / NN0433002 / 8000
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 SDWIS / NN0433002 / 0600
2012 Coliform (TCR) MR 3 SDWIS / NN0433002 / 3100
2010 Total Haloacetic Acids (HAA5) MR 1 SDWIS / NN0433002 / 2456
2010 TTHM MR 1 SDWIS / NN0433002 / 2950
2008 2,3,7,8-TCDD MR 6 SDWIS / NN0433002 / 2063
2008 Lead and Copper Rule MR 4 SDWIS / NN0433002 / 5000
2006 Consumer Confidence Rule Other 4 SDWIS / NN0433002 / 7000
2004 Methoxychlor MR 2 SDWIS / NN0433002 / 2015
2004 Endothall MR 2 SDWIS / NN0433002 / 2033
2004 Di(2-ethylhexyl) adipate MR 2 SDWIS / NN0433002 / 2035
2004 Simazine MR 2 SDWIS / NN0433002 / 2037
2004 Di(2-ethylhexyl) phthalate MR 2 SDWIS / NN0433002 / 2039
2004 Picloram MR 2 SDWIS / NN0433002 / 2040

How Chilchinbeto Community Day School BIA Compares

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

Metric Chilchinbeto Community Day School BIA Navajo Nation avg Federal benchmark
Total violations 143 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 138 984 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 170 regulated public water systems in Navajo Nation.

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 Chilchinbeto Community Day School BIA water safe to drink? ▼
Chilchinbeto Community Day School BIA (PWS ID: NN0433002) has 143 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 138 people using Groundwater sources.
How many people does Chilchinbeto Community Day School BIA serve? ▼
Chilchinbeto Community Day School BIA serves 138 people in Kayenta, Navajo Nation. It is a Federal-owned system using Groundwater water sources with 15 service connections.
What type of violations does Chilchinbeto Community Day School BIA have? ▼
Chilchinbeto Community Day School BIA has 143 total violations: 0 health-based violations (MCL exceedances or treatment failures), 124 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Chilchinbeto Community Day School BIA water? ▼
No PFAS testing data is available for Chilchinbeto Community Day School BIA under the EPA's UCMR5 monitoring program.
What water source does Chilchinbeto Community Day School BIA use? ▼
Chilchinbeto Community Day School BIA 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.