Pinal County · Arizona · EPA SDWIS 2026Q2
Casa Grande Water Quality
Is Casa Grande tap water safe to drink?
Casa Grande's public water is regulated to meet EPA legal limits. The EPA SDWIS record shows 9 contaminants on file, led by Arsenic, plus PFAS detected. Local water is very hard. But meeting legal limits isn't the same as zero-risk. Our Water Score rates it 51/100. See the breakdown below, or pull a free water report to learn what's actually coming out of your tap.
What's really in Casa Grande's water
Arsenic
Violation on record
19 EPA records on file (most recent 2025). Arsenic is a naturally occurring element that dissolves into groundwater from rock and is also released by mining and industry. Long-term exposure is associated with several cancers and with skin, cardiovascular, and developmental harm. It is common in parts of the Southwest.
Nitrate
Violation on record
5 EPA records on file (most recent 2022). Nitrate enters water mainly from fertilizer runoff, septic systems, and animal waste. High levels can interfere with the blood's ability to carry oxygen, a special danger for infants. Long-term low-level exposure has also been linked to elevated cancer risk in some studies.
PFAS (forever chemicals)
Detected
Detected in the supply below the federal limit. PFAS are "forever chemicals" that don't break down and accumulate over time. Compounds found: PFBA, PFBS, PFHpA, PFHxA, PFHxS, PFPeA.
Water hardness
very hard
Casa Grande'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.
Total Trihalomethanes (TTHM)
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2024).
Haloacetic Acids (HAA5)
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 2 EPA records on file (most recent 2024).
Radium (combined -226 & -228)
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2025).
Gross Beta / Photon Emitters
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2025).
Uranium
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2025).
Radium-226
Monitoring / reporting note
Monitoring / reporting compliance note — not a measured exceedance. 1 EPA record on file (most recent 2025).
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
ARIZONA WATER CO - PINAL VALLEY
- Population served
- 134,432
- PWSID
- AZ0411009
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