So does this only extend to denying people the right to access the water, or does he also not have to abide by things like electrical and earthquake building co

So does this only extend to denying people the right to access the water, or does he also not have to abide by things like electrical and earthquake building codes, since those were surely not in place when this treaty was established? In fact, why does he need building permits at all, if the State of California has no jurisdiction over this piece of land?