Coconino County · Arizona · EPA SDWIS 2026Q2
Total Trihalomethanes (TTHM) in Tusayan water
Total Trihalomethanes (TTHM) detected below the federal limit in Tusayan's public supply.
Total Trihalomethanes (TTHM)
Detected
Detected below the federal limit. 6 EPA records on file (most recent 2023).
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)
0.15 ppb
Federal legal limit (MCL)
80 ppb
Source: EPA MCL / MCLG; WHO guidelines · 2026
What removes Total Trihalomethanes (TTHM)
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Semipermeable membrane filtration
Reverse Osmosis
Pushes water through a fine membrane that removes the dissolved solids most filters miss.
Look for: NSF/ANSI 58 certification
How it works→Activated carbon adsorption
Whole-House Carbon Filter
A point-of-entry carbon bed that strips chlorine, chloramine, and chemical taste from every tap.
Look for: NSF/ANSI 42 certification
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Is Total Trihalomethanes (TTHM) in your water?
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