Community Water System · PWS NN0403048

Rock Point NTUA

Ft Defiance, Navajo Nation 86504 - drinking water served from groundwater sources to 1,029 people, tracked in EPA SDWIS and UCMR5.

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

1,029
People served: 129
EPA violations: 0
Health-based: Untested
UCMR5 result

The verdict

EPA records 129 drinking-water violations at Rock Point NTUA - below the Navajo Nation per-system average.

129
Total EPA violations on record: 0%
Health-based (MCL / treatment failure): 1,029
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rock Point NTUA

Rock Point NTUA is a native american-owned community water system that delivers drinking water to 1,029 residents in Ft Defiance, Navajo Nation through 301 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 129 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 122 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 9 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%).

Rock Point NTUA's 129 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

1,029

Total Violations

129

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Native American
Connections: 301
School/Daycare: No
MCL Violations: 0
Monitoring Violations: 122
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MR	9	2012
Nitrite	MR	4	2013
Cadmium	MR	3	2011
CYANIDE	MR	3	2011
Fluoride	MR	3	2011
Selenium	MR	3	2011
Beryllium, Total	MR	3	2011
DICHLOROMETHANE	MR	3	2011
o-Dichlorobenzene	MR	3	2011
Vinyl chloride	MR	3	2011
trans-1,2-Dichloroethylene	MR	3	2011
1,2-Dichloroethane	MR	3	2011
1,2-Dichloropropane	MR	3	2011
Trichloroethylene	MR	3	2011
CHLOROBENZENE	MR	3	2011
Tetrachloroethylene	MR	3	2011
Benzene	MR	3	2011
Styrene	MR	3	2011
Xylenes, Total	MR	3	2011
Mercury	MR	3	2011
TTHM	MR	3	2020
Arsenic	MR	3	2011
p-Dichlorobenzene	MR	3	2011
1,2,4-Trichlorobenzene	MR	3	2011
1,1,2-Trichloroethane	MR	3	2011
Barium	MR	3	2011
Thallium, Total	MR	3	2011
Toluene	MR	3	2011
Chromium	MR	3	2011
Total Haloacetic Acids (HAA5)	MR	3	2020

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 Rock Point NTUA.

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 NN0403048 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
2023	Public Notice	Other	2	SDWIS / NN0403048 / 7500
2023	Revised Total Coliform Rule	MON	1	SDWIS / NN0403048 / 8000
2020	TTHM	MR	3	SDWIS / NN0403048 / 2950
2020	Total Haloacetic Acids (HAA5)	MR	3	SDWIS / NN0403048 / 2456
2016	Revised Total Coliform Rule	Other	1	SDWIS / NN0403048 / 8000
2013	Nitrite	MR	4	SDWIS / NN0403048 / 1041
2013	Nitrate	MR	3	SDWIS / NN0403048 / 1040
2013	Stage 2 Disinfectants and Disinfection Byproducts Rule	MR	2	SDWIS / NN0403048 / 0600
2012	Coliform (TCR)	MR	9	SDWIS / NN0403048 / 3100
2011	Cadmium	MR	3	SDWIS / NN0403048 / 1015
2011	CYANIDE	MR	3	SDWIS / NN0403048 / 1024
2011	Fluoride	MR	3	SDWIS / NN0403048 / 1025
2011	Selenium	MR	3	SDWIS / NN0403048 / 1045
2011	Beryllium, Total	MR	3	SDWIS / NN0403048 / 1075
2011	DICHLOROMETHANE	MR	3	SDWIS / NN0403048 / 2964

How Rock Point NTUA Compares

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

Metric	Rock Point NTUA	Navajo Nation avg	Federal benchmark
Total violations	129	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	1,029	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 Rock Point NTUA water safe to drink? ▼

Rock Point NTUA (PWS ID: NN0403048) has 129 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,029 people using Groundwater sources.

How many people does Rock Point NTUA serve? ▼

Rock Point NTUA serves 1,029 people in Ft Defiance, Navajo Nation. It is a Native American-owned system using Groundwater water sources with 301 service connections.

What type of violations does Rock Point NTUA have? ▼

Rock Point NTUA has 129 total violations: 0 health-based violations (MCL exceedances or treatment failures), 122 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Rock Point NTUA water? ▼

No PFAS testing data is available for Rock Point NTUA under the EPA's UCMR5 monitoring program.

What water source does Rock Point NTUA use? ▼

Rock Point NTUA 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.