Dennis,
In a word, yes.
I had a lot of experience with this sort of situation, known in the trade as "sodic/saline" conditions, as a GCS in the Canary Islands.
the quality of water coming out of treatment plants is notoriously suspect. Regardless of what the contract says, the GCS has to water now and doesn't have time to go to court.
Common wisdom for irrigating with salty water is to continually flush. Theoretically, this doesn't build up the salt levels, but maintains them at a consistent, hopefully tolerant level, by moving excess salt down through the profile. This can work well on porous, sandy soils or not at all on heavy, clay ones.
There are several countermeasures. Aeration, to open up the soil and allow better water percolation is universally recommended. So is selection, where possible, of salt-tolerant turfgrasses. New varieties of seashore Paspalums have had success, but are restricted to warm climates. Gypsum applications, acid injection, and sulfur-burning water treatment apparatus can all be of some benefit in certain situations.