Public water system record

Todahaidekani NTUA

On record as serving San Juan County, UT · Serves 301 people

Federal records show 4 health-based violations and 7 monitoring/reporting issues for Todahaidekani NTUA in the last ten years. The most serious issue in this window was a resolved Arsenic violation.

NN4903071
FT DEFIANCE
AZ
301 served

System profile

Source water Purchased surface water

ZIP 86504

EPA system ID NN4903071

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 4
Resolved: 4
Unresolved: 0
Any acute record: No
Monitoring issues, last 10 years: 7

Key facts

Todahaidekani NTUA buys its water from Red Mesa NTUA.
Highest measured level in the last 10 years: Arsenic, 0.0109 mg/L, federal limit 0.01 mg/L (1.1 times the limit), 2017.
Record on file since 2002, with 8 health-based violations before October 19, 2016.

Check whether Todahaidekani 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 0.0105 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Apr 1, 2020	Resolved	No
Arsenic Contaminant limit exceeded Measured 0.0107 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Oct 1, 2018	Resolved	No
Arsenic Contaminant limit exceeded Measured 0.0106 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Jul 1, 2018	Resolved	No
Arsenic Contaminant limit exceeded Measured 0.0109 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Jan 1, 2017	Resolved	No

Monitoring and reporting issues

Since October 2016

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

Issue	Start date	Status
Arsenic Monitoring and reporting	Jan 1, 2022	Resolved
Public Notice OTHER	Apr 1, 2020	Resolved
Arsenic Monitoring and reporting	Jan 1, 2019	Resolved
Public Notice OTHER	Oct 1, 2018	Resolved
Public Notice OTHER	Jan 1, 2017	Resolved
Revised Total Coliform Rule OTHER	Apr 1, 2016	Resolved
Stage 2 Disinfection Byproducts Rule Monitoring and reporting	Oct 1, 2013	Resolved

Full record since 2002

EPA's records for Todahaidekani NTUA go back to 2002. Before October 19, 2016 they list 8 health-based violations (8 resolved) and 73 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
2000s	0	66
2010 to October 18, 2016	8	7
October 19, 2016 to 2019	3	3
2020s	1	2

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

Show all 8 health-based violations before October 19, 2016

Contaminant	Start date	Status
Arsenic Contaminant limit exceeded Measured 0.0106 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Jul 1, 2016	Resolved
Arsenic Contaminant limit exceeded Measured 0.0111 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Apr 1, 2016	Resolved
Arsenic Contaminant limit exceeded Measured 0.0111 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Jan 1, 2016	Resolved
Arsenic Contaminant limit exceeded Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	Oct 1, 2015	Resolved
Arsenic Contaminant limit exceeded Measured 0.0105 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	Oct 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.0172 mg/L, federal limit 0.01 mg/L (1.7 times the limit)	Jul 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.0182 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	Apr 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.01838 mg/L, federal limit 0.01 mg/L (1.8 times the limit)	Jan 1, 2013	Resolved

What the violations mean

Arsenic

4 incidents

Arsenic exceeded the federal limit

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

Where the water comes from

Todahaidekani NTUA buys its water from Red Mesa NTUA. It lists no wells or intakes of its own.

Buys water from

Red Mesa NTUA Ft Defiance, AZ

Annual water quality report

Todahaidekani 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.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Todahaidekani NTUA for a copy.

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