- EPA's UCMR 5 testing looked for 30 contaminants here and found 8.
- Lithium: found in 4 of 14 samples, average 2.94 µg/L, highest 11 µg/L (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFOA (a PFAS): found in 6 of 14 samples, average 2.5 ppt, highest 8 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFBS (a PFAS): found in 5 of 14 samples, average 1.9 ppt, highest 9.4 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFHxA (a PFAS): found in 6 of 14 samples, average 1.7 ppt, highest 7 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFPeA (a PFAS): found in 5 of 14 samples, average 1.6 ppt, highest 7.8 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFOS (a PFAS): found in 1 of 14 samples, average 0.40 ppt, highest 5.8 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFHpA (a PFAS): found in 1 of 14 samples, average 0.30 ppt, highest 3.6 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- PFHxS (a PFAS): found in 1 of 14 samples, average 0.30 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025)
- Lead, 90th percentile: 2 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.
- Health-based violation: Inorganic Chemicals, Nitrate, Jun 2022–Jul 2022 (EPA SDWIS)
Public EPA test results
Can you drink Gilroy tap water? What EPA records show
EPA CA4310004 · serves Gilroy, CA · about 59,426 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
City of Gilroy (EPA CA4310004)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Gilroy's main utility, City of Gilroy: 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 8.
What EPA records show for City of Gilroy, as of October 14, 2026
Health-based violation: Inorganic Chemicals, Nitrate, Jun 2022–Jul 2022 (EPA SDWIS).
Lead, 90th percentile: 2 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 8.
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 City of Gilroy use chloramine?
We didn't find chloramine in City of Gilroy'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)
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
Sources
- EPA ECHO detailed facility report: City of Gilroy (CA4310004), July to September 2026 extract
- EPA SDWIS (ECHO SDWA bulk download), July to September 2026 extract
- EPA UCMR 5 occurrence data, samples through June 2026
Questions people ask
Is Gilroy tap water safe to drink?
We don't give a safe or unsafe verdict. Here is what the public data shows: EPA records for Gilroy's main utility, City of Gilroy, as of October 14, 2026. 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 8. A guideline and a legal limit are different things, and this is public data, not a test of your tap.
Which utility supplies water in Gilroy?
City of Gilroy is the main utility for Gilroy in EPA's records (EPA CA4310004), serving about 59,426 people (EPA SDWIS). Your water bill names your utility.
Does Gilroy tap water contain PFAS?
PFOA (a PFAS): found in 6 of 14 samples, average 2.5 ppt, highest 8 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025). PFOS (a PFAS): found in 1 of 14 samples, average 0.40 ppt, highest 5.8 ppt (EPA UCMR 5 testing, Dec 2024–Jun 2025). This is public data, not a test of your tap.
How recent is this data?
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026. Data may be one to three years old and may not reflect the water at your tap. If you want your own tap tested, use a state-certified laboratory.
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