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Community Water System · PWS NN0403024

Round Rock Elementary School

Teec Nos Pos, Navajo Nation 86514 - drinking water served from groundwater sources to 396 people, tracked in EPA SDWIS and UCMR5.

396
People served
801
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 801 drinking-water violations at Round Rock Elementary School, 1% of them health-based - above the Navajo Nation per-system average.

801
Total EPA violations on record
1%
Health-based (MCL / treatment failure)
396
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Round Rock Elementary School

Round Rock Elementary School is a local-owned community water system that delivers drinking water to 396 residents in Teec Nos Pos, Navajo Nation through 82 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 801 total violations for this system , of which 6 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 717 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 Coliform (TCR), recorded in 66 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%).

Round Rock Elementary School's 801 violations sit above 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
396
Total Violations
801
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
82
School/Daycare
Yes
MCL Violations
3
Monitoring Violations
717
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 66 2015
Nitrate MR 24 2020
Revised Total Coliform Rule RPT 20 2025
Nitrite MR 17 2020
Diquat MR 12 2008
Endothall MR 12 2008
Glyphosate MR 12 2008
2,3,7,8-TCDD MR 12 2008
Total Polychlorinated Biphenyls (PCB) MR 12 2008
Endrin MR 9 2005
BHC-GAMMA MR 9 2005
Methoxychlor MR 9 2005
Toxaphene MR 9 2005
Dalapon MR 9 2005
Di(2-ethylhexyl) adipate MR 9 2005
OXAMYL MR 9 2005
Simazine MR 9 2005
Di(2-ethylhexyl) phthalate MR 9 2005
Picloram MR 9 2005
Dinoseb MR 9 2005
Hexachlorocyclopentadiene MR 9 2005
Aldicarb sulfoxide MR 9 2005
Aldicarb sulfone MR 9 2005
Carbofuran MR 9 2005
Aldicarb MR 9 2005
Atrazine MR 9 2005
LASSO MR 9 2005
Heptachlor MR 9 2005
2,4-D MR 9 2005
HEXACHLOROBENZENE MR 9 2005

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 Round Rock Elementary School.

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 NN0403024 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
2025 Revised Total Coliform Rule RPT 20 SDWIS / NN0403024 / 8000
2023 Revised Total Coliform Rule TT 3 SDWIS / NN0403024 / 8000
2022 Consumer Confidence Rule Other 7 SDWIS / NN0403024 / 7000
2021 Revised Total Coliform Rule MON 9 SDWIS / NN0403024 / 8000
2020 Nitrate MR 24 SDWIS / NN0403024 / 1040
2020 Nitrite MR 17 SDWIS / NN0403024 / 1041
2019 Public Notice Other 3 SDWIS / NN0403024 / 7500
2016 Revised Total Coliform Rule Other 4 SDWIS / NN0403024 / 8000
2015 Coliform (TCR) MR 66 SDWIS / NN0403024 / 3100
2015 Coliform (TCR) MCL 3 SDWIS / NN0403024 / 3100
2013 Stage 2 Disinfectants and Disinfection Byproducts Rule MR 3 SDWIS / NN0403024 / 0600
2008 Diquat MR 12 SDWIS / NN0403024 / 2032
2008 Endothall MR 12 SDWIS / NN0403024 / 2033
2008 Glyphosate MR 12 SDWIS / NN0403024 / 2034
2008 2,3,7,8-TCDD MR 12 SDWIS / NN0403024 / 2063

How Round Rock Elementary School Compares

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

Metric Round Rock Elementary School Navajo Nation avg Federal benchmark
Total violations 801 173.7 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 8 Indicates a contaminant exceeded a federal MCL
PFAS detection None 100% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 396 984 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 Round Rock Elementary School water safe to drink? ▼
Round Rock Elementary School (PWS ID: NN0403024) has 801 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 396 people using Groundwater sources.
How many people does Round Rock Elementary School serve? ▼
Round Rock Elementary School serves 396 people in Teec Nos Pos, Navajo Nation. It is a Local-owned system using Groundwater water sources with 82 service connections.
What type of violations does Round Rock Elementary School have? ▼
Round Rock Elementary School has 801 total violations: 6 health-based violations (MCL exceedances or treatment failures), 717 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Round Rock Elementary School water? ▼
No PFAS testing data is available for Round Rock Elementary School under the EPA's UCMR5 monitoring program.
What water source does Round Rock Elementary School use? ▼
Round Rock Elementary School 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.