Yavapai County · Arizona · EPA SDWIS 2026Q2
Nitrate in Mayer water
Nitrate measured above the federal limit in Mayer's public supply.
Nitrate
Violation on record
4 EPA records on file (most recent 2025). 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.
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)
0.14 ppm
Federal legal limit (MCL)
10 ppm
Source: EPA MCL / MCLG; WHO guidelines · 2026
What removes Nitrate
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