Mishongnovi (Upper Sipaulovi/Upper Mishongnovi)
PWSID: 090400394
This system has no unresolved violations. The most recent violation on record was 2025-07-01.
This system has more violations on record than 94% of water systems in Arizona.
Violation trend: 4.2 per year over the last 5 years, down from 8.8 per year in the previous 5.
System Details
| Population Served | 490 |
| Service Connections | 41 |
| Water Source | Groundwater Purchased |
| System Type | Community Water System |
| Owner | Native American |
| Status | Active |
| City | Second Mesa |
| EPA ZIP on File | 86043 |
Areas Served
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0010 mg/L | 0.015 mg/L | Below Action Level |
Violation History (167 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 0999 | MR | 2025-07-01 | Major | Acknowledged |
| 8000 | MON | 2025-07-01 | Major | Returned to Compliance |
| 8000 | MON | 2023-04-01 | Major | Acknowledged |
| 8000 | MON | 2023-04-01 | Major | Acknowledged |
| 8000 | MON | 2023-04-01 | Major | Acknowledged |
| 8000 | MON | 2023-03-01 | Major | Acknowledged |
| 8000 | MON | 2023-03-01 | Major | Returned to Compliance |
| 8000 | MON | 2023-03-01 | Major | Returned to Compliance |
| 8000 | MON | 2023-03-01 | Major | Returned to Compliance |
| 1005 | MCL Measured: 0.0165 MG/L (EPA limit: 0.010 mg/L) | 2022-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0165 MG/L (EPA limit: 0.010 mg/L) | 2022-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0165 MG/L (EPA limit: 0.010 mg/L) | 2022-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2022-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2022-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2022-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0178 MG/L (EPA limit: 0.010 mg/L) | 2022-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0178 MG/L (EPA limit: 0.010 mg/L) | 2022-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0180 MG/L (EPA limit: 0.010 mg/L) | 2021-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0180 MG/L (EPA limit: 0.010 mg/L) | 2021-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0180 MG/L (EPA limit: 0.010 mg/L) | 2021-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0180 MG/L (EPA limit: 0.010 mg/L) | 2021-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0172 MG/L (EPA limit: 0.010 mg/L) | 2021-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0172 MG/L (EPA limit: 0.010 mg/L) | 2021-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0167 MG/L (EPA limit: 0.010 mg/L) | 2021-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0167 MG/L (EPA limit: 0.010 mg/L) | 2021-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2020-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2020-10-01 | Yes | Returned to Compliance |
| 8000 | RPT | 2020-10-01 | Returned to Compliance | |
| 8000 | RPT | 2020-10-01 | Returned to Compliance | |
| 1005 | MCL Measured: 0.0177 MG/L (EPA limit: 0.010 mg/L) | 2020-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0177 MG/L (EPA limit: 0.010 mg/L) | 2020-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2020-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2020-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2020-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0175 MG/L (EPA limit: 0.010 mg/L) | 2020-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0172 MG/L (EPA limit: 0.010 mg/L) | 2019-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0172 MG/L (EPA limit: 0.010 mg/L) | 2019-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2019-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2019-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0165 MG/L (EPA limit: 0.010 mg/L) | 2019-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0165 MG/L (EPA limit: 0.010 mg/L) | 2019-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0163 MG/L (EPA limit: 0.010 mg/L) | 2019-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0163 MG/L (EPA limit: 0.010 mg/L) | 2019-01-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0166 MG/L (EPA limit: 0.010 mg/L) | 2018-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0166 MG/L (EPA limit: 0.010 mg/L) | 2018-10-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0166 MG/L (EPA limit: 0.010 mg/L) | 2018-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0166 MG/L (EPA limit: 0.010 mg/L) | 2018-07-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2018-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0170 MG/L (EPA limit: 0.010 mg/L) | 2018-04-01 | Yes | Returned to Compliance |
| 1005 | MCL Measured: 0.0169 MG/L (EPA limit: 0.010 mg/L) | 2018-01-01 | Yes | Returned to Compliance |
Showing 50 of 167 historical violations.
Understanding This Water System's Record
Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) is a community water system water system that draws from groundwater purchased sources and serves a population of 490 in Second Mesa, Arizona. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.