Lagoon Grass and Algae Control
2025
NOTICE OF CHEMICAL APPLICATION
LAGOON WEED & ALGAE CONTROL
During the summer, the BLPOA conducts a campaign to
control algae, wireweed, and widgeon grass in the Lagoon.
This annual notice is to inform residents that the
BLPOA intends to have its licensed applicator apply
certain aquatic treatments, as needed, to supplement
mechanical removal of these invasive and nuisance
species. Aquatic herbicides are typically
applied around the perimeter of the Lagoon and, based on
past years, are generally expected to be applied monthly
between approximately April and October. You may observe
BLPOA employees or the licensed applicators wearing
protective clothing and respirators while working with
some chemicals, in accordance with California regulations.
- Pond Dye, a blue dye from Cygnet. Applications
of Pond Dye place no restrictions on water use after
treatment.
- Tribune®, an aquatic herbicide with Diquat
dibromide as the active ingredient, is applied for
the control of widgeon grass and algae.
- Cygnet Plus®, a surfactant that improves the
efficiency of the herbicide, thereby helping reduce
the amount of herbicide treatment required.
There are no restrictions on water use following
application of the above-mentioned treatments.
Nevertheless, in an abundance of caution, the BLPOA
recommends swimmers and boaters refrain from water contact
activities during and shortly after application.
Subsequent to the application of the above treatments, you
may notice a black residue of the dead algae,
wireweed, and widgeon grass floating on the Lagoon. While
unsightly, there are no restrictions to the use of the
Lagoon while this condition exists.
If you have any questions about the use of treatments
in the Lagoon, please contact the Lagoon Maintenance and
Facilities Coordinator, Peter Ruppert, at (415)
435-0285, or email: info@belvederelagoon.org.
*** LAGOON WATER QUALITY ***
The BLPOA performs regular water quality tests and will
advise members
if tests indicate there is a problem with contacting the
Lagoon water.
Contact with Lagoon water should be avoided for at least
72 hours after a rain event.
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Lagoon Safety Tip:
Manually powered craft have the right-of-way
over sailboats and sailboards. Sailboats should
follow the basic "starboard over port tack" and
"leeward over windward" right-of-way rules when
encountering another sailboat or sailboard.
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