WaterQ

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

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

Hexachlorocyclopentadiene is an organic chemical compound that can sometimes be found in drinking water. It is categorized as an organic contaminant. The EPA has established a Maximum Contaminant Level (MCL) of 50 μg/L for this substance in public water systems.

Health Effects

Exposure to Hexachlorocyclopentadiene in drinking water above the regulatory limit can lead to adverse health effects. Specifically, ingestion of this contaminant has been associated with kidney and stomach problems. It is important to monitor water quality to avoid these potential health issues.

How Hexachlorocyclopentadiene Gets Into Tap Water

Hexachlorocyclopentadiene enters the environment primarily through industrial activities. The main source of this contaminant in water resources is wastewater discharges from chemical manufacturing facilities. Runoff or improper disposal from these industrial operations can lead to contamination of drinking water sources.

How to Remove Hexachlorocyclopentadiene From Your Water

If this organic compound is detected in water supplies, effective filtration methods are available for its removal. Water systems commonly utilize treatment methods such as granular activated carbon or packed tower aeration to reduce its concentration. These standard filtration techniques are effective at bringing the levels below the EPA limit.

Should You Test Your Water?

Consumers can check for this contaminant by reviewing their annual consumer confidence report or by searching the local utility data on the WaterQ website. If you rely on a private well located near chemical manufacturing activities, periodic testing for organic chemicals is recommended. You can also look up your local water system on WaterQ or check the Hexachlorocyclopentadiene data page for reported levels in your area.

Frequently Asked Questions

Is Hexachlorocyclopentadiene dangerous in drinking water?

Yes, Hexachlorocyclopentadiene can be harmful if it is present in drinking water at levels exceeding the EPA limit. Ingestion of this organic contaminant has been linked to kidney and stomach problems. It is important to treat water if these levels are exceeded to protect health.

How does Hexachlorocyclopentadiene get into tap water?

This contaminant typically enters the water supply through releases from chemical manufacturing facilities.

How can I remove Hexachlorocyclopentadiene from my water?

It can be effectively removed from drinking water using treatment methods like granular activated carbon or packed tower aeration.

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