WaterQ

Hexachlorobenzene in Drinking Water: Health Risks, Sources, and How to Remove It

Alex Carter
Water Quality Researcher · Published 2026-06-23

Hexachlorobenzene is an organic chemical contaminant that can be found in drinking water. It is regulated by the Environmental Protection Agency (EPA) with a Maximum Contaminant Level (MCL) of 1 μg/L. Consuming water containing this substance above the regulatory limit can pose health risks.

Health Effects

Exposure to Hexachlorobenzene in drinking water over long periods can lead to liver and kidney problems. Additionally, there is an increased risk of developing cancer from long-term exposure to this contaminant. It is important to minimize exposure to protect long-term health.

How Hexachlorobenzene Gets Into Tap Water

Hexachlorobenzene primarily enters water sources through industrial and agricultural activities. Specifically, releases from metal refineries and agricultural chemical production facilities can contaminate nearby water supplies. Runoff and discharge from these operations are the main pathways for the contaminant to enter the environment.

How to Remove Hexachlorobenzene From Your Water

Water systems can be treated to remove Hexachlorobenzene using granular activated carbon. This treatment method is highly effective at absorbing and filtering out the organic compound from water. Certified residential water treatment systems utilizing this technology are commonly used for this purpose.

Should You Test Your Water?

If you are concerned about Hexachlorobenzene, you can review your local utility's annual Consumer Confidence Report or check the WaterQ database for testing results. Well owners near industrial or agricultural areas may also consider testing their water through a certified laboratory. You can also look up your local water system on WaterQ or check the Hexachlorobenzene data page for reported levels in your area.

Frequently Asked Questions

Is Hexachlorobenzene dangerous in drinking water?

Yes, Hexachlorobenzene can be hazardous if present in drinking water above the regulatory standard. Long-term consumption of contaminated water is associated with liver and kidney problems, as well as an increased risk of cancer. Maintaining levels below the EPA limit is essential to reduce these health risks.

How does Hexachlorobenzene get into tap water?

Hexachlorobenzene typically enters tap water sources through industrial waste and agricultural runoff. It is primarily released into the environment from metal refineries and facilities involved in agricultural chemical production.

How can I remove Hexachlorobenzene from my water?

You can remove Hexachlorobenzene from your drinking water using granular activated carbon filtration. Treatment systems using this technology are commonly certified and effective for removing this specific organic contaminant.

Source: EPA National Primary Drinking Water Regulations and WaterQ National Database. For more contaminants, visit our contaminant library.