Zak, Darling,
What's a TDS? What are all those other initials you gave? LOL! since I'm an organic type of gardener, and we don't use pesticides or chemical fertilisers or fungicides on our property(and neither do our neighbors) I figger the ground water is ok? There's probably some leachate from more distant properties, sure...but not much. The sump pump runs about every 3 minutes or so...so I would think if there were major toxins they would have been rinsed out eons ago.
In fact, there's an EPA superfund site a mile from here. The people in THAT subdivision have to use bottled water for everything. Our groundwater flows towards that subdivision.
My subdivision is known as the "slums of Wauconda", so named by the former mayor(who's idea of a "starter" home is $350K+)..I don't know, to me it looks like a normal 60's ranch house community...and nobody has the money to spend on silly things like lawn service or Scott's 4 in 1, LOl! The neighbors to the north of me have a child who is autistic...they for sure keep their lawn natural, as they think autism may be caused or aggravated by chemicals in the environment. Neighbor to the south doesn't put that much time into his lawn. Neighbors across the street have putting greens for lawns.
I don't have time for finicky plants...it's why I grow native. Thrive or die. Darlingtonia are really pretty...but they're not native in this area, so I don't feel a huge sense of loss! April