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States Affected
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People Affected
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Toxicity Rating
Health Effects

Kidney problems, reproductive difficulties, cancer

The legal limit is
Health Guideline
5 ppb
what is considered unhealthy
Legal Limit
700 ppb
What is Glyphosate?
Glyphosate is the main chemical used in Roundup® weed killer and is one of the most widely used herbicides in large-scale agriculture. Glyphosate is also used domestically. Since glyphosate was first introduced as an herbicide in the 1970s, its use has increased by at least 100 times. With the emergence of glyphosate-resistant weeds, glyphosate use is expected to increase even more.
Why is Glyphosate in my tap water?
You could be at risk of drinking water that contains glyphosate if you drink well water and live in an agricultural area. Well water isn’t treated, and glyphosate can contaminate groundwater sources that supply wells as a result of agricultural use. If you drink water from a municipal source, which is required to test for glyphosate, keep in mind that the legal limit (700 parts per billion, or ppb) is much higher than the safe limit (5 ppb). So just because your water may pass the legal test for glyphosate, this doesn’t necessarily make it safe for consumption or free from glyphosate. Glyphosate contamination can happen as a result of wind and runoff from agricultural herbicide use. Wind can blow glyphosate as it is being sprayed into nearby surface water, such as streams and lakes. Overuse or rain and irrigation can also lead to contamination of surface water and groundwater. Glyphosate use, both in terms of how often and how much is used, is increasing because it does not always work as well as it once did. This may increase the chances that glyphosate ends up in water sources that feed tap water supplies.
Why is Glyphosate in my tap water harmful?
Yes. Glyphosate is a highly controversial chemical that has been linked to cancer in more than 18,000 lawsuits. The state of California has declared glyphosate a known carcinogen. The World Health Organization’s International Agency for Research on Cancer has declared glyphosate as “probably carcinogenic to humans.” Risks of glyphosate ingestion include kidney problems, reproductive difficulties, and an increased risk of non-Hodgkin's lymphoma. Exposure during pregnancy may affect fetal development.
How much Glyphosate is safe?
The amount of glyphosate that is safe is unknown at this time. More studies are needed to determine what level is safe. The current safe limit for glyphosate is 5 ppb, while the legal limit is much higher at 900 ppb.
What can I do about Glyphosate in my tap water?
Clearly Filtered® with Affinity® Filtration Technology gives you the power to remove up to 99.9% of glyphosate from your tap water, giving you peace of mind that comes from knowing your drinking water is finally clean and safe. Basic water filters that rely on simple carbon (like Brita®) or charcoal are only effective at removing unpleasant odors and taste. These filters are not capable of stopping glyphosate and instead allows it to pass right through the filter into the water you're drinking. More sophisticated technology like Clearly Filtered is required to provide this type of contaminant removal.
How does Clearly Filtered do at Removing Glyphosate?
Clearly Filtered with
Affinity Filtration Technology Product
Water Pitcher Filter
Under-the-Sink FIlter
Water Bottle Filter
Refrigerator Filter
Glyphosate Removal

1. US EPA. National primary Drinking Water Regulations. Accessed September 2, 2019.

2. California Office of Environmental Health Hazard Assessment. Arsenic. Accessed September 10, 2019.