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Chlorination Disinfection Byproducts in Tap Water (THMs, HAAs) — household safety profile

Moderate risk

Chlorine added to municipal water reacts with natural organic matter to form disinfection byproducts (DBPs): trihalomethanes (THMs — chloroform, bromodichloromethane, BDCM), haloacetic acids (HAAs), and hundreds of unregulated DBPs.

What is this product?

Chlorine added to municipal water reacts with natural organic matter to form disinfection byproducts (DBPs): trihalomethanes (THMs — chloroform, bromodichloromethane, BDCM), haloacetic acids (HAAs), and hundreds of unregulated DBPs. EPA Stage 2 DBP Rule: MCL 80 ppb total THMs, 60 ppb total HAAs. Bladder cancer risk: meta-analyses show 15-40% increased risk with long-term high THM exposure. DBP exposure occurs via drinking, cooking, showering (inhalation/dermal), and swimming. Granular activated carbon (GAC) filters remove 50-90% of THMs.

What's in it

Click any compound name for its full safety profile, regulatory consensus, and exposure data.

Trace

Who's most at risk

  • Children — Developing endocrine and neurological systems, higher exposure per body weight

Red flags — when to walk away

  • Water quality not tested or treatment system not maintained — Unknown contaminant exposure or treatment failure.

Green flags — what to look for

  • NSF-certified treatment system with current maintenance — Verified contaminant reduction with functioning system.

Safer alternatives

  • GAC filter at kitchen tap — removes 50-90% THMs
  • Shower filter with KDF + GAC — reduces inhalation exposure
  • Whole-house carbon filter — addresses all exposure routes

Frequently asked questions

Who should be careful with Chlorination Disinfection Byproducts in Tap Water (THMs, HAAs)?

Vulnerable populations identified for this product type: children.

Are there safer alternatives to Chlorination Disinfection Byproducts in Tap Water (THMs, HAAs)?

Yes — consider: GAC filter at kitchen tap; Shower filter with KDF + GAC; Whole-house carbon filter. See the Safer alternatives section above for details.

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Reference data, not professional advice. Aggregates publicly available regulatory and scientific information. Why we built ALETHEIA →