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Disinfection Byproduct

Haloacetic Acids (HAA5) in your water

Is Haloacetic Acids (HAA5) in drinking water dangerous?

It depends on the level and how long you're exposed. The EPA legal limit (MCL) for Haloacetic Acids (HAA5) is 60 ppb. Meeting the legal limit isn't the same as zero risk — test your water to know your level.

How do you remove Haloacetic Acids (HAA5) from water?

Haloacetic Acids (HAA5) is treated by Reverse Osmosis and Whole-House Carbon Filter. Choose a system independently certified to NSF/ANSI standards to reduce Haloacetic Acids (HAA5), and test your water first to confirm the level.

Source: EPA MCL / MCLG; WHO guidelines; NSF/ANSI · 2026

Health effects

HAA5 are a second group of chlorine disinfection byproducts formed when chlorine reacts with organic matter in water. Long-term exposure is associated with increased cancer risk and possible developmental effects. They commonly occur together with trihalomethanes.

The health-based goal vs. the legal limit

The federal legal limit (MCL) is the maximum allowed by law. The EPA health goal (MCLG) is the level below which no health risk is expected — it is non-enforceable and often stricter than the legal limit.

EPA health goal (MCLG)

No federal health goal set

Federal legal limit (MCL)

60 ppb

Source: EPA National Primary Drinking Water Regulations (MCL / MCLG) · 2026

What removes Haloacetic Acids (HAA5)

carbonRO

Where Haloacetic Acids (HAA5) has been found

Haloacetic Acids (HAA5) shows up in the public water record for these cities. Each page has the measured level, the legal limit, and what removes it.

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Is Haloacetic Acids (HAA5) in your water?

Check your city's public record, then book a free 30-minute test to confirm what's in your home.