Public water system record
Hopi High School - BIA
On record as serving Navajo County, AZ · Serves 1,005 people
Federal records show 10 health-based violations and 108 monitoring/reporting issues for Hopi High School - BIA in the last ten years, including an unresolved Stage 1 Disinfection Byproducts Rule violation.
System profile
Source water
Groundwater
ZIP
86043
EPA system ID
090400395
- Health-based violations, last 10 years
- 10
- Resolved
- 3
- Unresolved
- 3
- Archived by EPA
- 4
- Any acute record
- No
- Monitoring issues, last 10 years
- 108
Key facts
- Hopi High School - BIA draws water from 2 wells.
- Highest measured level in the last 10 years: Arsenic, 0.0159 mg/L, federal limit 0.01 mg/L (1.6 times the limit), 2016.
- Most recent formal enforcement: compliance order (no penalty) by EPA, March 2011.
- Record on file since 1991, with 37 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 58 unknown out of 58 service lines.
Check whether Hopi High 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 |
|---|---|---|---|---|
|
Stage 1 Disinfection Byproducts Rule
Treatment technique failure
|
210 | Oct 21, 2025 | Active | No |
|
Fluoride
Contaminant limit exceeded
Measured 4.9 mg/L, federal limit 4 mg/L (1.2 times the limit)
|
330 | Oct 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 0.014 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
|
330 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Fluoride
Contaminant limit exceeded
Measured 4.9 mg/L, federal limit 4 mg/L (1.2 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 |
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Active | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.014 mg/L, federal limit 0.01 mg/L (1.4 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 |
|
Groundwater Rule
Treatment technique failure
|
140 | Jan 14, 2023 | Active | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Nov 14, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0136 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
|
330 | Jan 1, 2017 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0159 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
330 | 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 |
|---|---|---|
|
Fluoride
Monitoring and reporting
|
Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Public Notice
OTHER
|
Jul 1, 2025 | Active |
|
Arsenic
Monitoring and reporting
|
Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Fluoride
Monitoring and reporting
|
Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Public Notice
OTHER
|
Feb 1, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2025 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2025 | Active |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2025 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Fluoride
Monitoring and reporting
|
Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Jan 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Nov 16, 2024 | Active |
|
Fluoride
Monitoring and reporting
|
Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Fluoride
Monitoring and reporting
|
Apr 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Nitrate
Monitoring and reporting
|
Jan 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Chlorine
Monitoring and reporting
|
Oct 1, 2023 | Resolved |
|
Fluoride
Monitoring and reporting
|
Oct 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
RPT
|
Aug 1, 2023 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2023 | Active |
|
Public Notice
OTHER
|
Jul 1, 2023 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2023 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2023 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jul 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Public Notice
OTHER
|
Jun 1, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2023 | Resolved |
|
Revised Total Coliform Rule
RPT
|
May 1, 2023 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Apr 1, 2023 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2023 | Resolved |
|
Fluoride
Monitoring and reporting
|
Apr 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Arsenic
Monitoring and reporting
|
Apr 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Public Notice
OTHER
|
Mar 1, 2023 | Active |
|
Revised Total Coliform Rule
RPT
|
Mar 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Glyphosate
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Thallium, Total
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Beryllium, Total
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Antimony, Total
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Selenium
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Nitrate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Mercury
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Fluoride
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
CYANIDE
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Chromium (total)
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Cadmium
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Barium
Monitoring and reporting
|
Jan 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Fluoride
Monitoring and reporting
|
Oct 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2022 | Resolved |
|
E. coli
Monitoring and reporting
|
Aug 1, 2022 | Active |
|
E. coli
Monitoring and reporting
|
Jul 1, 2022 | Active |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2022 | Resolved |
|
Fluoride
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jan 1, 2022 | Resolved |
|
Chlorine
Monitoring and reporting
|
Oct 1, 2021 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Chlorine
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Fluoride
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Arsenic
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Fluoride
Monitoring and reporting
|
Oct 1, 2020 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2020 | Resolved |
|
E. coli
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Arsenic
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Beryllium, Total
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Chromium (total)
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Cadmium
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Barium
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2015 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2014 | Resolved |
|
Styrene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Toluene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Benzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Vinyl chloride
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
Full record since 1991
EPA's records for Hopi High School - BIA go back to 1991. Before October 19, 2016 they list 37 health-based violations (37 resolved) and 106 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 11 |
| 2000s | 20 | 41 |
| 2010 to October 18, 2016 | 17 | 54 |
| October 19, 2016 to 2019 | 2 | 10 |
| 2020s | 7 | 71 |
Most recent health-based violation before October 19, 2016: Arsenic, began October 2016, Resolved.
Show all 37 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.0159 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
Oct 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0161 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
Jul 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0158 mg/L, federal limit 0.01 mg/L (1.6 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 |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2013 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01176 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Oct 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01333 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
|
Jul 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0166 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Apr 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0166 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jan 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0172 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Oct 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.02267 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
Jul 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0191 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Apr 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01765 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jan 1, 2009 | Resolved |
|
Fluoride
Contaminant limit exceeded
Measured 23.15 mg/L, federal limit 4 mg/L (5.8 times the limit)
|
Jul 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
Jul 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
Apr 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
Jan 1, 2008 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
Measured 0.10579 mg/L, federal limit 0.03 mg/L (3.5 times the limit)
|
Oct 1, 2007 | Resolved |
|
Fluoride
Contaminant limit exceeded
Measured 23.15 mg/L, federal limit 4 mg/L (5.8 times the limit)
|
Oct 1, 2007 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)
|
Oct 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2007 | Resolved |
|
Fluoride
Contaminant limit exceeded
Measured 43 mg/L, federal limit 4 mg/L (11 times the limit)
|
Jan 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2001 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2001 | Resolved |
Enforcement actions
EPA took 2 formal enforcement actions against Hopi High School - BIA in 2011, filed as 13 records in EPA's data. The most recent was a compliance order (no penalty) in March 2011.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 23, 2011 | EPA | Compliance order (no penalty) | 20 violations (12 health-based): Arsenic, Lead and Copper Rule |
| Mar 22, 2011 | EPA | Compliance order (no penalty) | 12 violations (12 health-based): Arsenic |
What the violations mean
Arsenic
4 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
Fluoride
2 incidentsFluoride exceeded the federal limit
Excessive fluoride can cause dental and skeletal fluorosis
Groundwater Rule
2 incidentsThe system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Stage 1 Disinfection Byproducts Rule
1 incidentThe system did not meet a treatment requirement of the Stage 1 Disinfectants and Disinfection Byproducts Rule
Byproducts form when disinfectants react with natural material in water. Long-term exposure above federal limits may increase cancer risk
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Hopi High School - BIA draws water from 2 wells.
Annual water quality report
Hopi High 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.
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