I'm from the Northeast and have played tennis and golf at a few of the comparable high end places - the subcontractors don't usually speak english either, usually the head groundskeeper is white and speaks it well enough to communicate to the staff who know not to speak to members. Alternatively, the groundskeeper is someone that's been in the US long enough to speak English well enough that nobody would think about his immigration status. In some of the wealthiest places, it's usually a kid whose parents are illegal but he was born and raised in the US, was blessed with intelligence and won a scholarship to a great NEASC school where a member of the club is on the alumni board.

I can also attest that some of the multigenerational "my great grandkids won't have to work a day in their lives" wealth types are some of the cheapest and stingiest people I've ever met, and most certainly don't care that the groundskeepers at their too-cool-for-school clubs in Westchester or The Hamptons or Greenwich speak zero english and aren't here legally. In fact, that's the expectation, because god forbid their club dues go up by a few hundred dollars a year (while they spend that same amount on a single dinner at the clubhouse).