- EPA's UCMR 5 testing looked for 30 contaminants here and found 2.
- Lithium: found in 4 of 18 samples, average 4.93 µg/L, highest 32 µg/L (EPA UCMR 5 testing, Mar 2023–Feb 2025)
Public EPA test results
What EPA records show for San Lorenzo Valley Water Dist
EPA CA4410014 · serves Santa Cruz County, CA · about 21,513 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
San Lorenzo Valley Water Dist (EPA CA4410014)
What EPA records show for San Lorenzo Valley Water Dist, as of October 14, 2026
Health-based violation: Lead and Copper Rule, LEAD AND COPPER RULE REVISIONS, from Oct 2024, with no return-to-compliance action in EPA records (EPA SDWIS).
Lead, 90th percentile: 2.7 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.
EPA's UCMR 5 testing looked for 30 contaminants here and found 2.
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 San Lorenzo Valley Water Dist use chloramine?
We didn't find chloramine in San Lorenzo Valley Water Dist'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)