Public EPA test results
Can you drink San Jose tap water? What EPA records show
EPA CA4310011 · serves Santa Clara County, CA · about 1,039,920 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 Jose Water (EPA CA4310011)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For San Jose's main utility, San Jose Water: 1 health-based violation since July 1, 2021 in EPA records (EPA SDWIS). EPA's UCMR 5 testing looked for 30 contaminants here and found 3.
What EPA records show for San Jose Water, as of October 14, 2026
Health-based violation: Surface Water Treatment Rules, Surface Water Treatment Rule, Jun 2023–Aug 2023 (EPA SDWIS).
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, 2023–Dec 31, 2025). 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.
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 Jose Water use chloramine?
EPA treatment records (state-reported) list chloramines for San Jose Water. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)