Pima County · Arizona · EPA SDWIS 2026Q2
Mercury in Oro Valley water
Mercury detected below the federal limit in Oro Valley's public supply.
Mercury
Detected
Detected below the federal limit. 1 EPA record on file (most recent 2014).
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)
No health-based goal set
Federal legal limit (MCL)
2 ppb
Source: EPA MCL / MCLG; WHO guidelines · 2026
What removes Mercury
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