- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- PFOS (a PFAS): found in 1 of 16 samples, average 0.30 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Oct 2023–Mar 2025)
- Lead, 90th percentile: 1 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 Duarte tap water? What EPA records show
EPA CA1910186 · serves Los Angeles County, CA · about 24,767 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
Cal-Am Water Company - Duarte (EPA CA1910186)
EPA data as of October 14, 2026. For Duarte's main utility, Cal-Am Water Company - Duarte: We found no health-based violations in EPA's records for this system (CA1910186) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 1. This is public data, not a test of your tap.
What EPA records show for Cal-Am Water Company - Duarte, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA1910186) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Cal-Am Water Company - Duarte (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 1 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 1.
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 Cal-Am Water Company - Duarte use chloramine?
We didn't find chloramine in Cal-Am Water Company - Duarte's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.