Public EPA test results
What EPA records show for Gswc-South Arcadia
EPA CA1910212 · serves Los Angeles County, CA · about 27,430 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
Gswc-South Arcadia (EPA CA1910212)
What EPA records show for Gswc-South Arcadia, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA1910212) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Gswc-South Arcadia (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 0.66 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, 2024–Dec 31, 2026). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
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 Gswc-South Arcadia use chloramine?
We didn't find chloramine in Gswc-South Arcadia's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)