13 and 27% per km with uptake by the benthic sediment being 365 and 603 g/km . In two other experiments in which glyphosate was added to flowing water to simulate contamination during foliar spaying, 63% of the glyphosate was scavenged by sediment in 14 km and 43% was removed in 14 km . In a field study, glyphosate was sprayed on sediment in an irrigation channel in spring and 4 days afterwards the channel was filled with water. Based on the observed concentration levels, less than 7% of the applied glyphosate eluted with water . ATMOSPHERIC FATE: Glyphosate will be released into the atmosphere as an aerosol during spraying and removed by gravitational settling. It will occur in the atmosphere only as an aerosol and may degrade by photolysis. Drinking Water Impact GROUNDWATER: Glyphosate was detected in groundwater and water supply monitoring programs in Texas . The concn and site details were not reported . In a survey of farm wells in Ontario, Canada, 103 in 1986 and 76 in 1987, glyphosate was not detected in any wells . However, glyphosate was only used on crops on 28 farms in 1986 and 1987 .

Consumer Factsheet on: GLYPHOSATE
EPA

As part of the Drinking Water and Health pages, this fact sheet is part of a larger publication:
National Primary Drinking Water Regulations

This is a factsheet about a chemical that may be found in some public or private drinking watersupplies. It may cause health problems if found in amounts greater than the health standard set bythe United States Environmental Protection Agency (EPA).

What is Glyphosate and how is it used?

Glyphosate is an organic solid of odorless white crystals. It is a non-selective herbicide used onmany food and non-food crops as well as non-crop areas such as roadsides. When applied atlower rates, it serves as a plant growth regulator. The most common uses include control ofbroadleaf weeds and grasses in: hay/pasture, soybeans, field corn; ornamentals, lawns, turf, forestplantings, greenhouses, rights-of-way.

The list of trade names given below may help you find out whether you are using this chemical athome or work.

Trade Names and Synonyms:

Glialka
Roundup
Sting
Rodeo
Spasor
Muster
Tumbleweed
Sonic
Glifonox
Glycel
Rondo
　

Why is Glyphosate being Regulated?

In 1974, Congress passed the Safe Drinking Water Act. This law requires EPA to determine safelevels of chemicals in drinking water which do or may cause health problems. Thesenon-enforceable levels, based solely on possible health risks and exposure, are called MaximumContaminant Level Goals.

The MCLG for glyphosate has been set at 0.7 parts per million (ppm) because EPA believes thislevel of protection would not cause any of the potential health problems described below.
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