- EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
- Lithium: found in 13 of 26 samples, average 6.23 µg/L, highest 20 µg/L (EPA UCMR 5 testing, Oct 2024–Apr 2026)
- PFPeA (a PFAS): found in 2 of 26 samples, average 0.50 ppt, highest 6.5 ppt (EPA UCMR 5 testing, Oct 2024–Apr 2026)
- PFHxA (a PFAS): found in 2 of 26 samples, average 0.30 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Oct 2024–Apr 2026)
- Lead, 90th percentile: 0 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2022–Dec 31, 2024). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Catalina tap water? What EPA records show
EPA AZ0411117 · serves Catalina, AZ · about 18,132 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Lago del Oro Water Company (EPA AZ0411117)
EPA data as of October 14, 2026. For Catalina's main utility, Lago del Oro Water Company: We found no health-based violations in EPA's records for this system (AZ0411117) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Lago del Oro Water Company, as of October 14, 2026
We found no health-based violations in EPA's records for this system (AZ0411117) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Lago del Oro Water Company (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 0 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2022–Dec 31, 2024). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Lago del Oro Water Company use chloramine?
We didn't find chloramine in Lago del Oro Water Company's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.