Maricopa County · Arizona · EPA SDWIS 2026Q2
Gilbert Water Quality
Is Gilbert tap water safe to drink?
Gilbert's public water is regulated to meet EPA legal limits. The EPA SDWIS record shows 13 contaminants on file, led by Total Trihalomethanes (TTHM), plus PFAS detected. Local water is very hard. But meeting legal limits isn't the same as zero-risk. Our Water Score rates it 60/100. See the breakdown below, or pull a free water report to learn what's actually coming out of your tap.
What's really in Gilbert's water
PFAS (forever chemicals)
Violation on record
Detected above the EPA's 4 ppt limit for PFOA/PFOS — the "forever chemicals" linked to cancer and immune effects. Compounds found: PFBA, PFBS, PFHxA, PFOA, PFOS, PFPeA.
Total Trihalomethanes (TTHM)
Detected
Detected below the federal limit. 5 EPA records on file (most recent 2023).
Water hardness
very hard
Gilbert's water is very hard. Hardness isn't a health risk, but it drives scale on fixtures and water heaters, shortens appliance life, and leaves skin and hair dry.
Monitoring & reporting notes
EPA records below are administrative or monitoring/reporting compliance items — not measured exceedances of the legal limit. They do not, on their own, mean the water is unsafe.
Arsenic
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 14 EPA records on file (most recent 2025).
Nitrate
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 11 EPA records on file (most recent 2025).
Cadmium
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
Mercury
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
Fluoride
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
Haloacetic Acids (HAA5)
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2023).
Selenium
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
PFOA
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
Barium
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2021).
Atrazine
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2021).
PFOS
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2021).
EPA violations may be administrative or monitoring/reporting issues rather than measured exceedances of a health limit. A utility appearing on this list does not by itself mean the water is unsafe to drink. Health-based goals (EPA MCLG / WHO) are health targets and are often stricter than the legal limit (the federal MCL). The only way to know what is in your specific home is to test your own water.
Your water provider
GILBERT, TOWN OF
- Population served
- 247,600
- PWSID
- AZ0407092
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