Deltamethrin?long-term toxicity to cats or dogs is not significant
1.General population: The exposure of the general population to
deltamethrin is expected to be very low and is not likely to
present a hazard under recommended conditions of use.
Occupational exposure: With good work practices, measures of
hygiene, and safety precautions, deltamethrin is unlikely to
present a hazard for those occupationally exposed.
Environment: It is unlikely that deltamethrin or its degradation
products will attain levels of adverse environmental significance
with recommended rates of application. Under laboratory
conditions, deltamethrin is highly toxic for fish, aquatic
arthropods, and honey-bees. However, under field conditions,
lasting adverse effects are not likely to occur under recommended
conditions of use.
Breakdown in Soil and Groundwater
In soil, degradation occurs within 1-2 weeks
Breakdown in Surface Water
Deltamethrin in pond water was rapidly adsorbed, mostly by sediment,
in addition to uptake by plants and evaporation into the air
Breakdown in Vegetation
About 10 days after use, there are no deltamethrin residues observed
on plants. There is no known phytotoxicity to crops
Deltamethrin was degraded in cotton plants, under glasshouse
conditions, with an initial half-life of 1.1 weeks, and the time
needed for 90% loss was 4.6 weeks.
The major metabolites were free and conjugated Br2CA, trans-
hydroxymethyl-Br2CA, and 3-(4-hydroxyphenoxy)benzoic acid formed by
ester cleavage, oxidation, and conjugation.
Deltamethrin was incubated in sand and organic soil at 28 °C
under laboratory conditions. Approximately 52% and 74% of the
applied deltamethrin was recovered from sand and organic soil,
respectively, 8 weeks after treatment.
Deltamethrin is not mobile in the environment because of its
strong adsorption on particles, its insolubility in water, and very
low rates of application.
No data are available on actual levels in the environment, but
with the current use pattern and under normal conditions of use,
environmental exposure is expected to be very low. Degradation to
less toxic products is rapid.
you can find more informations to the toxicity and degradation period
of Deltamethrin.(The first link ,I think ,is the most useful to you.