WaterQ

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

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

Methoxychlor is an organic chemical that can contaminate drinking water supplies. It is categorized as an organic contaminant by the Environmental Protection Agency. The EPA has established a Maximum Contaminant Level (MCL) of 40 μg/L for this substance.

Health Effects

Consuming water with levels of Methoxychlor above the regulatory limit can lead to health issues. Specifically, exposure to this organic chemical is associated with reproductive difficulties. Minimizing exposure to this contaminant is recommended to prevent these difficulties.

How Methoxychlor Gets Into Tap Water

Methoxychlor typically enters the water supply through environmental runoff and leaching. The primary source of this contaminant in drinking water is insecticide residues. These residues can migrate from application sites into nearby water sources.

How to Remove Methoxychlor From Your Water

Effective water treatment methods are available to remove this contaminant from your drinking water. Granular activated carbon is a common and reliable treatment method used for this purpose. Utilizing filtration systems that feature granular activated carbon can help ensure your water remains within safe limits.

Should You Test Your Water?

To check for Methoxychlor in your water, you can review your local water utility's annual Consumer Confidence Report or check WaterQ. Private well owners, particularly in areas with agricultural activity, may also consider testing their water for this organic contaminant. You can also look up your local water system on WaterQ or check the Methoxychlor data page for reported levels in your area.

Frequently Asked Questions

Is Methoxychlor dangerous in drinking water?

At levels exceeding the EPA limit of 40 μg/L, Methoxychlor in drinking water is associated with reproductive difficulties. Because it is regulated under organic contaminants, public water systems monitor for it to keep levels safe. If you use a private water source, testing can confirm if it is safe from this chemical.

How does Methoxychlor get into tap water?

Methoxychlor enters tap water through insecticide residues that run off or leach into water sources. This typically happens in areas where the chemical has been applied for pest control.

How can I remove Methoxychlor from my water?

You can remove Methoxychlor from your drinking water using granular activated carbon treatment systems. These filters are highly effective at absorbing and reducing organic contaminants.

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