Public water system record
Seba Dalkai Boarding School BIA
On record as serving Seba Dalkai, Navajo County, AZ · Serves 250 people
Federal records show 21 health-based violations and 22 monitoring/reporting issues for Seba Dalkai Boarding School BIA 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
- 21
- Resolved
- 21
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 22
Key facts
- Seba Dalkai Boarding School BIA buys its water from Dilkon-Indian Wells-Greasewood-White Cone NTUA.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.1877 mg/L, federal limit 0.08 mg/L (2.3 times the limit), 2018.
- Most recent formal enforcement: compliance order (no penalty) by Navajo Nation EPA, July 2019.
- Record on file since 1996, with 21 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 20 service lines.
Check whether Seba Dalkai Boarding School BIA 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 0.0883 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 0.0992 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jul 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0924 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Apr 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1218 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Jan 1, 2021 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1082 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1244 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Jul 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1247 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Apr 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1187 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Jan 1, 2020 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1195 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Oct 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.103 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jul 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1469 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1602 mg/L, federal limit 0.08 mg/L (2 times the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1877 mg/L, federal limit 0.08 mg/L (2.3 times the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1877 mg/L, federal limit 0.08 mg/L (2.3 times the limit)
|
220 | Jul 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1297 mg/L, federal limit 0.08 mg/L (1.6 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1385 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 0.1325 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1385 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.147 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1195 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1084 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
RPT
|
Apr 1, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2025 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Oct 1, 2023 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Oct 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2021 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2021 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2020 | Active |
|
Revised Total Coliform Rule
RPT
|
May 1, 2020 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2019 | Active |
|
Public Notice
OTHER
|
Jul 1, 2019 | Active |
|
Public Notice
OTHER
|
Apr 1, 2019 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Public Notice
OTHER
|
Apr 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 1996
EPA's records for Seba Dalkai Boarding School BIA go back to 1996. Before October 19, 2016 they list 21 health-based violations (19 resolved, 2 archived by EPA without a recorded fix) and 24 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 2 | 4 |
| 2000s | 6 | 13 |
| 2010 to October 18, 2016 | 13 | 7 |
| October 19, 2016 to 2019 | 12 | 9 |
| 2020s | 8 | 11 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.
Show all 21 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1084 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1194 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Apr 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1403 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
Jan 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1403 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
Oct 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.139 mg/L, federal limit 0.08 mg/L (1.7 times the limit)
|
Jul 1, 2015 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.0854 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Apr 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.10865 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
Jan 1, 2013 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1044 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
Oct 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.14537 mg/L, federal limit 0.08 mg/L (1.8 times the limit)
|
Apr 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1188 mg/L, federal limit 0.08 mg/L (1.5 times the limit)
|
Jan 1, 2012 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.18 mg/L, federal limit 0.08 mg/L (2.3 times the limit)
|
Oct 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2002 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Aug 14, 1996 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Aug 14, 1996 | Resolved |
Enforcement actions
Navajo Nation EPA took 1 formal enforcement action against Seba Dalkai Boarding School BIA in 2019, filed as 18 records in EPA's data. The most recent was a compliance order (no penalty) in July 2019.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jul 12, 2019 | Navajo Nation EPA | Compliance order (no penalty) | 18 violations (18 health-based): Total Trihalomethanes (TTHMs) |
What the violations mean
Total Trihalomethanes (TTHMs)
21 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Where the water comes from
Seba Dalkai Boarding School BIA buys its water from Dilkon-Indian Wells-Greasewood-White Cone NTUA. It lists no wells or intakes of its own.
Buys water from
- Dilkon-Indian Wells-Greasewood-White Cone NTUA Fort Defiance, AZ
Annual water quality report
Seba Dalkai Boarding School BIA 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 Seba Dalkai Boarding School BIA 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