Kitt Peak National Observatory
PWSID: 090402057
This system has no unresolved violations. The most recent violation on record was 2024-11-16.
Violation trend: 1.2 per year over the last 5 years, up from 0.4 per year in the previous 5.
System Details
| Population Served | 247 |
| Service Connections | 41 |
| Water Source | Surface Water |
| System Type | Non-Transient Non-Community |
| Owner | Federal |
| Status | Active |
| City | Tucson |
| EPA ZIP on File | 85719 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.1354 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0981 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0393 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0383 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0355 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0335 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0245 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0240 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0238 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0235 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0220 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0210 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0195 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0175 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0166 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0143 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0120 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0093 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0083 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0055 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0055 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) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0050 mg/L | 0.015 mg/L | Below Action Level |
Violation History (9 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5200 | RPT | 2024-11-16 | Returned to Compliance | |
| 5200 | RPT | 2024-11-16 | Returned to Compliance | |
| 8000 | RPT | 2024-01-01 | Returned to Compliance | |
| 8000 | RPT | 2024-01-01 | Returned to Compliance | |
| 8000 | RPT | 2021-10-01 | Returned to Compliance | |
| 8000 | RPT | 2021-10-01 | Returned to Compliance | |
| 1009 | MCL Measured: 1.10 MG/L | 2017-03-01 | Yes | Returned to Compliance |
| 1009 | MCL Measured: 1.10 MG/L | 2017-03-01 | Yes | Returned to Compliance |
| 5000 | MR | 2008-01-01 | Returned to Compliance |
Understanding This Water System's Record
Kitt Peak National Observatory is a non-transient non-community water system that draws from surface water sources and serves a population of 247 in Tucson, 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.