ISDA officials collected and processed water samples for Triclopyr herbicide from the treatment areas and two sites outside the treatment areas yesterday morning about 12 hours post treatment. Their laboratory has provided results from that sampling.
The EPA label for the herbicides used indicates that water withdrawals from the treatment area should not be used for potable supply until herbicide levels are below 0.4 parts per million in the water. The label further indiates that water withdrawals for irrigation should not occur until herbicide levels are below detection.
Yesterday’s results are as follows: North Bear Creek Bay (Treatment area) 0.0855 ppm, South Bear Creek Bay (Treatment area) 1.330 ppm. Two samples were also collected outside of the treatment area, one to the west of the lake in untreated open water (0.0114 ppm) and one north of Bear Creek Bay along the homes there in an untreated area. The levels there were 0.0069 parts per billion.
As such, the potable water use restrctions outside the areas of the actual treatment area have expired. The levels within the treatment area still remain above the cut off for irrigation and the southern sample indicates above the potable water use restriction level.
If there are questions regarding this contact us through the log a case system above.
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