Pinal County · Arizona · EPA SDWIS 2026Q2
Arsenic in Florence water
Arsenic measured above the federal limit in Florence's public supply.
Arsenic
Violation on record
25 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.
EPA records reflect the public water system, not your home's plumbing. Health-based goals (EPA MCLG / WHO) are health targets and are often stricter than the federal legal limit (the MCL). A utility appearing on this list does not by itself mean the water is unsafe to drink. The only way to know what is in your specific home is to test your own water.
The health-based goal vs. the legal limit
The federal legal limit (MCL) is the maximum allowed by law. The health-based goal (EPA MCLG / WHO) is a stricter health target — not itself a legal limit.
Health-based goal (EPA MCLG / WHO)
0.004 ppb
Federal legal limit (MCL)
10 ppb
Source: EPA MCL / MCLG; WHO guidelines · 2026
What removes Arsenic
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