http://https://www.invasive.org/gist...Glyphosate.pdf
"The half-life of glyphosate ranges from several weeks to years, but averages two months. In water, glyphosate is rapidly dissipated through adsorption to
suspended and bottom sediments, and has a half-life of 12
days to ten weeks"
http://https://www3.epa.gov/pesticid...3-20090617.pdf
Reference page 92: United States Environmental Protection Agency - Monsanto's RoundUp Update of Master Label data.
8.1 Aquatic Sites
This product may be applied to emerged weeds in all bodies of fresh and brackish water which may be
flowing, nonflowing or transient. This includes lakes, rivers, streams, ponds, estuaries, rice levees, seeps,
irrigation and drainage ditches, canals, reservoirs, wastewater treatment facilities, wildlife habitat
restoration and management areas.
This product may also be use to control weeds, woody brush and trees in other terrestrial non-crop sites
or in aquatic sites associated with these areas. These use areas include airports, apartment complexes,
commercial sites, ditch banks, dry ditches, dry canals, tence rows, forestry sites, golf courses, habitat
restoration and management areas, industrial sites,
lumber yards, manufacturing sites, municipal sites,
natural areas, office complexes, public areas, parks, parking areas, petroleum tank farms and pumping
installations, railroads, recreational areas, residential areas, roadsides, schools,
storage areas,
substations, utility rights-ot-way, utility sites, warehouse areas, and wildlife management areas.
This product may also be used in non-food crop sites such as
Christmas tree farms, plant and ornamental
nurseries, pastures and rangelands and
sold or turf seed farms.
If aquatic sites are present in the non-crop area and are part of the intended treatment, read and observe
the following directions:
This product does not control plants which are completely submerged or have a majority of their
foliage under water.
Th.ere is no restriction on the use of treated water for irrigation, recreation or domestic purposes.
Consult your local state
fish and
game agency and water control authorities before applying this product
to public water. Permits may be required to treat such water.
NOTE: Do not apply this product directly to water within 0.5 mile up-stream of an active potable water
intake in flowing water (i.e., river, stream, etc.) or within 0.5 mile of an active potable water intake in a
standing body of water such as lake, pond or reservoir. To make aquatic applications around and within 0.5
mile of active potable water intakes, the water intake must be turned off for a minimum period of 48 hours
after the application. The water intake may be turned on prior to 48 hours if the glyphosate level in the
intake water is below 0.7
parts per million as determined by laboratory analysis. These aquatic applications
may be made ONLY in those cases where there are alternative water sources or holding ponds which would
permit the turning off of an active potable water intake for a minimum period of 48 hours after the
applications. This restriction does NOT apply to intermittent inadvertent overspray of water in terrestrial use
sites.
For treatments after drawdown of water or in dry ditches, allow 7 or more days after treatment before
reintroduction of water to achieve maximum weed control. Apply this product within 1 day after drawdown
to ensure applic(ition to actively growing weeds.