Is it safe to drink from soft-water systems with known disinfection byproducts?

What's actually in it

Water treatment uses chlorine or chloramine to disinfect, which reacts with organic matter to produce disinfection byproducts (DBPs). Trihalomethanes and haloacetic acids are the classic regulated DBPs. Newer research is identifying emerging DBPs like 2,6-dichloro-1,4-benzoquinone that have serious toxicity but aren't routinely measured or regulated.

Systems using surface water (rivers, lakes) typically have more DBP formation than groundwater systems.

What the research says

A 2026 study in Toxicology demonstrated mitochondrial toxicity of the emerging disinfection byproduct 2,6-dichloro-1,4-benzoquinone in renal proximal tubule cells. The mechanism involved oxidative phosphorylation disruption. Relevant exposure levels matched what consumers get from treated tap water.

For kidney-protective water: carbon block filters (Brita Max, Clearly Filtered, Berkey, or under-sink) reduce DBPs including the emerging ones. Reverse osmosis systems handle nearly all DBPs. For shower exposure (significant because hot water releases DBPs as vapor), carbon shower filters reduce the breathing-in side. For well water users, this is less of a concern unless the well is already chlorinated.