Haloacetic Acids (HAA5) in Drinking Water: Health Risks, Sources, and How to Remove It
Haloacetic Acids (HAA5) is a contaminant in the organic category. The Environmental Protection Agency (EPA) has set its Maximum Contaminant Level (MCL) in drinking water at 60 μg/L. Monitoring this level helps ensure water quality is maintained.
Health Effects
Consuming drinking water with elevated levels of Haloacetic Acids (HAA5) can impact human health. The primary health effect associated with this contaminant is an increased risk of cancer. Managing exposure to this organic compound is important for long-term health.
How Haloacetic Acids (HAA5) Gets Into Tap Water
Haloacetic Acids (HAA5) originate from specific sources in drinking water systems. This contaminant is classified under disinfection byproducts. It enters the water supply through these disinfection-related sources.
How to Remove Haloacetic Acids (HAA5) From Your Water
Several methods can be used to treat water containing Haloacetic Acids (HAA5). Effective treatment methods include granular activated carbon and enhanced coagulation. These systems are commonly utilized to reduce levels of this organic contaminant.
Should You Test Your Water?
To check for Haloacetic Acids (HAA5), you can review your local water utility's consumer confidence report or search the WaterQ database. Homeowners with private wells can also choose to test their water through a certified laboratory. You can also look up your local water system on WaterQ or check the Haloacetic Acids (HAA5) data page for reported levels in your area.
Frequently Asked Questions
Is Haloacetic Acids (HAA5) dangerous in drinking water?
Haloacetic Acids (HAA5) can pose health risks if present in drinking water. Exposure to this organic contaminant is associated with an increased risk of cancer. Keeping levels below the MCL of 60 μg/L is recommended to limit these risks.
How does Haloacetic Acids (HAA5) get into tap water?
Haloacetic Acids (HAA5) enter tap water through disinfection byproducts. These sources introduce the contaminant into the water system during treatment.
How can I remove Haloacetic Acids (HAA5) from my water?
You can remove Haloacetic Acids (HAA5) from your water using treatment methods such as granular activated carbon or enhanced coagulation.
Source: EPA National Primary Drinking Water Regulations and WaterQ National Database. For more contaminants, visit our contaminant library.
What actually removes trihalomethanes and disinfection byproducts
These are the trade-off contaminants: they exist because the water is being disinfected, and disinfection prevents far more harm than the byproducts cause. That said, they are easy to reduce. Activated carbon with an NSF/ANSI 53 VOC claim handles them well, so a modest under-sink or pitcher filter is sufficient. Levels are usually highest in summer and at the far end of the distribution network.
Works
- Carbon certified for lead (NSF 53)The cheapest thing that genuinely removes lead, cysts and many VOCs.
- Reverse osmosis (NSF 58)The broadest removal available at home: arsenic, nitrate, fluoride, PFAS, TDS.
- Basic activated carbon (NSF 42)Fixes taste and smell. Does not remove any health-regulated contaminant.
Will not fix this
- Ion-exchange water softener
- UV disinfection (NSF 55)
Options that carry the right certification
Ordered cheapest-adequate first. Prices are indicative bands and move often.
| Product | Certification | Upfront | Per year | |
|---|---|---|---|---|
| Aquasana AQ-5200 Under-SinkUnder-sink | NSF/ANSI 42, 53, 401 and P473 certified.Catch:Carbon, not RO — no meaningful fluoride, nitrate or arsenic reduction. | $110–160 | $80–120 | Check price |
| Brita Elite Pitcher FilterPitcher | NSF/ANSI 42 and 53 certified, including a lead reduction claim.Catch:No fluoride, nitrate or arsenic reduction. Not PFAS-rated. | $25–40 | $50–70 | Check price |
| APEC ROES-50 EssenceUnder-sink | Built with WQA-certified components to NSF/ANSI 58.Catch:Needs an under-sink drain connection and a spare hole for the dedicated faucet. Strips minerals — some people dislike the flat taste. | $180–240 | $50–80 | Check price |
Certification listings change. Before buying, confirm the current listing for the exact model in the NSF certified products database — a manufacturer's marketing page is not a certification. WaterQ earns a commission on purchases made through these links at no extra cost to you; see our affiliate disclosure. This is general information, not medical or engineering advice.
For a full breakdown of certifications, running costs and the models worth considering, see our buying guide for trihalomethanes and disinfection byproducts.