if its cold water theres more of a loss.
room temp or lukewarm water wont take as much trichs off.
as long as you dont agitate the plant material too much, its okay.
when i water cured buds i just sat some buds in a glass of water for a day and took them out,
dripped off the water, and dried em.
not much difference in trich content (keep in mind i didnt grind it up, just straight buds)
but the high is noticably cleaner (less inactives and other shit).
you get more of a thc high than a high with all the other shit thrown in.
like someone on here posted a while back,
the high you feel from cannabis is also a mild poisoning due to the other chemicals in the plant matter that are being burned.