Disinfection byproducts
Haloacetic Acids (HAA5)
What it is
Five related chemicals that form when chlorine reacts with natural organic matter in water. Like TTHM, they are tracked at points around the distribution system.
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home
Haloacetic acids do not affect plumbing.
Federal standard: MCL 60 ppb (locational running annual average, EPA)
Treatment options that can reduce it
Maryland water systems that reported haloacetic acids
- Baltimore City Department of Public WorksBaltimore City (also serves most of Baltimore County) · 2025 data
- City of AnnapolisAnne Arundel · 2025 data
- City of CambridgeDorchester · 2025 data
- City of FrederickFrederick · 2025 data
- City of SalisburyWicomico · 2025 data
- Easton UtilitiesTalbot · 2025 data
- Harford County Department of Public WorksHarford · 2025 data
- Howard County Department of Public WorksHoward · 2025 data
- Town of OxfordTalbot · 2025 data
- Town of St. MichaelsTalbot · 2025 data
- Town of TrappeTalbot · 2025 data
- WSSC WaterMontgomery and Prince George's · 2025 data
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
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