Public water system record

Toadlena NTUA

On record as serving San Juan County, NM · Serves 903 people

Federal records show 36 health-based violations and 16 monitoring/reporting issues for Toadlena NTUA in the last ten years. The most serious issue in this window was a Arsenic violation that EPA lists as archived, not resolved.

NN3503028
FT DEFIANCE
AZ
903 served

System profile

Source water Groundwater

ZIP 86504

EPA system ID NN3503028

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 36
Resolved: 0
Unresolved: 0
Archived by EPA: 36
Any acute record: No
Monitoring issues, last 10 years: 16

Key facts

Toadlena NTUA draws water from 2 wells.
Highest measured level in the last 10 years: Arsenic, 0.0178 mg/L, federal limit 0.01 mg/L (1.8 times the limit), 2021.
Most recent formal enforcement: compliance order (no penalty) by Navajo Nation EPA, September 2013.
Record on file since 2003, with 16 health-based violations before October 19, 2016.

Check whether Toadlena NTUA serves your address

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant	Rule family	Start date	Status	Acute
Arsenic Contaminant limit exceeded Measured 0.0127 mg/L, federal limit 0.01 mg/L (1.3 times the limit)	330	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01165 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	330	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01263 mg/L, federal limit 0.01 mg/L (1.3 times the limit)	330	Jan 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01273 mg/L, federal limit 0.01 mg/L (1.3 times the limit)	330	Oct 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01363 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	330	Jul 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01488 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Apr 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.01428 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	330	Jan 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0151 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Oct 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0145 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jul 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0135 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	330	Apr 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0133 mg/L, federal limit 0.01 mg/L (1.3 times the limit)	330	Jan 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0128 mg/L, federal limit 0.01 mg/L (1.3 times the limit)	330	Oct 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0115 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	330	Jul 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0119 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	330	Apr 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0135 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	330	Jan 1, 2022	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0157 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	330	Oct 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0175 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	330	Jul 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0178 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	330	Apr 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0177 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	330	Jan 1, 2021	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0156 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	330	Oct 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0146 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jul 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0149 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Apr 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0149 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jan 1, 2020	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0148 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Oct 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0153 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jul 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0146 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0147 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0147 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Oct 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0154 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Jul 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0111 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Apr 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Jan 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0111 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Oct 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0109 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Jul 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0165 mg/L, federal limit 0.01 mg/L (1.7 times the limit)	330	Apr 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0158 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	330	Jan 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.0154 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	330	Oct 1, 2016	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue	Start date	Status
Public Notice OTHER	Apr 1, 2025	Active
Public Notice OTHER	Oct 1, 2024	Active
Public Notice OTHER	Jul 1, 2024	Resolved
Public Notice OTHER	Apr 1, 2024	Resolved
Public Notice OTHER	Apr 1, 2022	Resolved
Arsenic Monitoring and reporting	Jan 1, 2022	Resolved
Public Notice OTHER	Apr 1, 2021	Resolved
Public Notice OTHER	Apr 1, 2020	Resolved
Total Trihalomethanes (TTHMs) Monitoring and reporting	Jan 1, 2020	Resolved
Haloacetic Acids (HAA5) Monitoring and reporting	Jan 1, 2020	Resolved
Arsenic Monitoring and reporting	Jul 1, 2019	Resolved
Arsenic Monitoring and reporting	Apr 1, 2019	Resolved
Arsenic Monitoring and reporting	Jan 1, 2019	Resolved
Public Notice OTHER	Oct 1, 2018	Resolved
Public Notice OTHER	Jan 1, 2017	Resolved
Stage 2 Disinfection Byproducts Rule Monitoring and reporting	Oct 1, 2013	Resolved

Full record since 2003

EPA's records for Toadlena NTUA go back to 2003. Before October 19, 2016 they list 16 health-based violations (5 resolved, 11 archived by EPA without a recorded fix) and 76 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
2000s	1	65
2010 to October 18, 2016	15	11
October 19, 2016 to 2019	12	5
2020s	23	10

Most recent health-based violation before October 19, 2016: Arsenic, began October 2016, Archived.

Show all 16 health-based violations before October 19, 2016

Contaminant	Start date	Status
Arsenic Contaminant limit exceeded Measured 0.0154 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Oct 1, 2016	Archived
Arsenic Contaminant limit exceeded Measured 0.0153 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Jul 1, 2016	Archived
Arsenic Contaminant limit exceeded Measured 0.0109 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Apr 1, 2016	Resolved
Arsenic Contaminant limit exceeded Measured 0.0106 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Jan 1, 2016	Resolved
Arsenic Contaminant limit exceeded Measured 0.0146 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Oct 1, 2015	Archived
Arsenic Contaminant limit exceeded Measured 0.0154 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Jul 1, 2015	Archived
Arsenic Contaminant limit exceeded Measured 0.0149 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Jan 1, 2015	Archived
Arsenic Contaminant limit exceeded Measured 0.0155 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	Oct 1, 2014	Archived
Arsenic Contaminant limit exceeded Measured 0.0142 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	Jul 1, 2014	Archived
Arsenic Contaminant limit exceeded Measured 0.0143 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	Apr 1, 2014	Archived
Arsenic Contaminant limit exceeded Measured 0.01418 mg/L, federal limit 0.01 mg/L (1.4 times the limit)	Jan 1, 2014	Archived
Arsenic Contaminant limit exceeded Measured 0.01595 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	Oct 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.015 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Jul 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.01758 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	Apr 1, 2013	Archived
Arsenic Contaminant limit exceeded Measured 0.01758 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	Jan 1, 2013	Archived
Total Coliform Contaminant limit exceeded	Jul 1, 2004	Resolved

Enforcement actions

Navajo Nation EPA took 1 formal enforcement action against Toadlena NTUA in 2013, filed as 54 records in EPA's data. The most recent was a compliance order (no penalty) in September 2013.

Date	By	Action	Violations covered
Sep 23, 2013	Navajo Nation EPA	Compliance order (no penalty)	54 violations (48 health-based): Arsenic, Public Notice

What the violations mean

Arsenic

36 incidents

Arsenic exceeded the federal limit

Long-term arsenic exposure is linked to cancer and cardiovascular effects

Where the water comes from

Toadlena NTUA draws water from 2 wells.

Annual water quality report

Toadlena NTUA must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by EPA Region 9.

Certified drinking water labs by state EPA guidance for private wells