Public water system record
Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)
Serves Second Mesa, Navajo County, AZ · 490 people served
Federal records show 24 health-based violations and 12 monitoring/reporting issues for Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) in the last ten years. The most serious issue in this window was a resolved Arsenic violation.
System profile
Source water
Purchased groundwater
ZIP
86043
EPA system ID
090400394
- Health-based violations, last 10 years
- 24
- Resolved
- 24
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 12
Key facts
- Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) buys its water from Huc Regional Water System.
- Highest measured level in the last 10 years: Arsenic, 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit), 2021.
- Most recent formal enforcement: compliance order (no penalty) by EPA, October 2018.
- Record on file since 1991, with 38 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 40 unknown out of 40 service lines.
Check whether Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) 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 |
|---|---|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.0165 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jul 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0175 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Apr 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0178 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Jan 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Oct 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Jul 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0172 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Apr 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0167 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jan 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.017 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Oct 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0177 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0175 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Apr 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0175 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
330 | Jan 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0172 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Oct 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.017 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jul 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0165 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Apr 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0163 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
330 | Jan 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0166 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Oct 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0166 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jul 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.017 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Apr 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0169 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jan 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0165 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Oct 1, 2017 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0167 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jul 1, 2017 | Resolved | 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 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0167 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
330 | Jan 1, 2017 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.0169 mg/L, federal limit 0.01 mg/L (1.7 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 |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Dec 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Chlorine
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 |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2025 | Resolved |
|
Chlorine
Monitoring and reporting
|
Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Mar 1, 2023 | Resolved |
|
Revised Total Coliform Rule
RPT
|
Oct 1, 2020 | Resolved |
|
Public Notice
OTHER
|
Jul 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Apr 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2016 | Resolved |
|
Public Notice
OTHER
|
Oct 1, 2015 | Resolved |
Full record since 1991
EPA's records for Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) go back to 1991. Before October 19, 2016 they list 38 health-based violations (38 resolved) and 246 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 125 |
| 2000s | 10 | 91 |
| 2010 to October 18, 2016 | 28 | 30 |
| October 19, 2016 to 2019 | 12 | 0 |
| 2020s | 11 | 8 |
Most recent health-based violation before October 19, 2016: Arsenic, began October 2016, Resolved.
Show all 38 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.0169 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Oct 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0168 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jul 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Apr 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jan 1, 2016 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Oct 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jul 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Apr 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0171 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jan 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0174 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Oct 1, 2014 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0173 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jul 1, 2014 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0186 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Apr 1, 2014 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0186 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Jan 1, 2014 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01752 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Oct 1, 2013 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01752 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jul 1, 2013 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01752 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Apr 1, 2013 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jan 1, 2013 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Oct 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01913 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Jul 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01913 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Apr 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01813 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jan 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0185 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
Oct 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0175 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jul 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0176 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Apr 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0176 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jan 1, 2011 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01775 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Oct 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01775 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jul 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01775 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Apr 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01693 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jan 1, 2010 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01693 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Oct 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.0174 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jul 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01785 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Apr 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01785 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jan 1, 2009 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Oct 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Jul 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01733 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Apr 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.01733 mg/L, federal limit 0.01 mg/L (1.7 times the limit)
|
Jan 1, 2008 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.018 mg/L, federal limit 0.01 mg/L (1.8 times the limit)
|
Oct 1, 2007 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.016 mg/L, federal limit 0.01 mg/L (1.6 times the limit)
|
Apr 1, 2007 | Resolved |
Enforcement actions
EPA took 1 formal enforcement action against Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) in 2018, filed as 66 records in EPA's data. The most recent was a compliance order (no penalty) in October 2018.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 3, 2018 | EPA | Compliance order (no penalty) | 66 violations (60 health-based): Arsenic, Public Notice |
What the violations mean
Arsenic
24 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
Where the water comes from
Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) buys its water from Huc Regional Water System. It lists no wells or intakes of its own.
Buys water from
- Huc Regional Water System Flagstaff, AZ
Annual water quality report
Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) 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 Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) 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