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Tap water quality report

City of Gilroy

EPA monitoring tested this supplier for 109 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
21
detected
59,203
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Santa Clara

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

2
health-based violations
2
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2022-06-01 → 2022-06-30
MCL Health-based Resolved 2022-06-01 → 2022-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0070 µg/L 6/14 2025
PFOA 0.0080 µg/L 6/14 2025
PFBS 0.0094 µg/L 5/14 2025
Pfpea 0.0078 µg/L 5/14 2025
Pfhpa 0.0036 µg/L 1/14 2025
PFHXS 0.0035 µg/L 1/14 2025
PFOS 0.0058 µg/L 1/14 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
8588 µg/L 86%
of the EPA limit 10000 µg/L
worst single sample: 10170 µg/L
718/720 SYR4 2012–2019
Tetrachloroethylene
2.7 µg/L 54%
of the EPA limit 5 µg/L
worst single sample: 3.5 µg/L
80/284 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 45/45 LCR 2024
TTHM
11 µg/L 14%
of the EPA limit 80 µg/L
worst single sample: 13.51 µg/L
31/32 SYR4 2016–2019
Bromoform
10.235 µg/L
No EPA limit set
worst single sample: 11.88 µg/L
30/32 SYR4 2016–2019
Fluoride
170 µg/L 4.3%
of the EPA limit 4000 µg/L
 18/27 SYR4 2012–2018
Barium
140 µg/L 7%
of the EPA limit 2000 µg/L
 15/27 SYR4 2012–2018
Dibromoacetic Acid
2.91 µg/L
No EPA limit set
worst single sample: 3.4 µg/L
15/32 SYR4 2016–2019
Total Haloacetic Acids (HAA5)
4.49 µg/L 7.5%
of the EPA limit 60 µg/L
worst single sample: 5.7 µg/L
12/32 SYR4 2016–2019
Nitrate-Nitrite
8460 µg/L 85%
of the EPA limit 10000 µg/L
worst single sample: 8500 µg/L
9/9 SYR4 2018
Lithium
11 µg/L
No EPA limit set
 4/14 UCMR-5 2025
Dibromochloromethane
1.7725 µg/L
No EPA limit set
worst single sample: 1.78 µg/L
2/32 SYR4 2016–2019
Dichloroacetic Acid
3.69 µg/L
No EPA limit set
worst single sample: 3.8 µg/L
2/32 SYR4 2016–2019
Trichloroacetic Acid
1.9 µg/L
No EPA limit set
 2/32 SYR4 2016–2019
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
CASTRO, JEFF
Phone
408-846-0223
Email
[email protected]

Frequently asked questions about City of Gilroy

Is City of Gilroy tap water safe to drink?

EPA monitoring detected 21 contaminants in City of Gilroy's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in City of Gilroy's water?

EPA monitoring detected Nitrate, Tetrachloroethylene, Lead, TTHM, Bromoform, and others. The full list with the level and data source for each is above.

How many people does City of Gilroy serve?

City of Gilroy reports serving 59,203 people in California, per its EPA record.

Has City of Gilroy had any water quality violations?

The EPA has 2 violations on file for City of Gilroy, of which 2 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.