Public water system record
Dilkon-Indian Wells-Greasewood-White Cone NTUA
On record as serving Indian Wells, Navajo County, AZ · Serves 4,986 people
Federal records show 22 health-based violations and 11 monitoring/reporting issues for Dilkon-Indian Wells-Greasewood-White Cone NTUA in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.
System profile
- Health-based violations, last 10 years
- 22
- Resolved
- 22
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 11
Key facts
- Dilkon-Indian Wells-Greasewood-White Cone NTUA draws water from 3 wells.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.1898 mg/L, federal limit 0.08 mg/L (2.4 times the limit), 2018.
- Most recent formal enforcement: compliance order (no penalty) by Navajo Nation EPA, April 2013.
- Record on file since 2003, with 27 health-based violations before October 19, 2016.
Check whether Dilkon-Indian Wells-Greasewood-White Cone NTUA serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0847 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Oct 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1027 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jul 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1245 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Apr 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1283 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Jan 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1458 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
220 | Oct 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1435 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
220 | Jul 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1037 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Apr 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1052 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1109 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1119 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1313 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.169 mg/L, federal limit 0.08 mg/L (2.1 times the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1898 mg/L, federal limit 0.08 mg/L (2.4 times the limit)
|
220 | Jul 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1505 mg/L, federal limit 0.08 mg/L (1.9 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1356 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1117 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0854 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1005 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1016 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1208 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Oct 1, 2016 | Resolved | No |
|
Revised Total Coliform Rule
Treatment technique failure
|
110 | Aug 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Jul 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2022 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2021 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2020 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2018 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2017 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2017 | Resolved |
|
Revised Total Coliform Rule
OTHER
|
Apr 1, 2016 | Active |
Full record since 2003
EPA's records for Dilkon-Indian Wells-Greasewood-White Cone NTUA go back to 2003. Before October 19, 2016 they list 27 health-based violations (26 resolved, 1 archived by EPA without a recorded fix) and 44 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 11 | 32 |
| 2010 to October 18, 2016 | 16 | 12 |
| October 19, 2016 to 2019 | 12 | 6 |
| 2020s | 8 | 4 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.
Show all 27 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1208 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Oct 1, 2016 | Resolved |
|
Revised Total Coliform Rule
Treatment technique failure
|
Aug 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1358 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Jul 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1119 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Apr 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1119 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jan 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1275 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
Oct 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1518 mg/L, federal limit 0.08 mg/L (1.9 times the limit)
|
Jul 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.08613 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.11227 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jul 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.12114 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Apr 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.13987 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2009 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 2009 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2003 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2003 | Resolved |
Enforcement actions
Navajo Nation EPA took 1 formal enforcement action against Dilkon-Indian Wells-Greasewood-White Cone NTUA in 2013, filed as 30 records in EPA's data. The most recent was a compliance order (no penalty) in April 2013.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Apr 3, 2013 | Navajo Nation EPA | Compliance order (no penalty) | 30 violations (28 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
What the violations mean
Total Trihalomethanes (TTHMs)
21 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Where the water comes from
Dilkon-Indian Wells-Greasewood-White Cone NTUA draws water from 3 wells. 1 other community water system buys water from Dilkon-Indian Wells-Greasewood-White Cone NTUA.
Community systems that buy water from it
- Seba Dalkai Boarding School BIA Winslow, AZ
Annual water quality report
Dilkon-Indian Wells-Greasewood-White Cone 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