Hello Dale,

There is not a plethora of studies about water salinity and the effect on grass plants, but I did find one study from the University of California. See the lower middle of page 2: https://anrcatalog.ucanr.edu/pdf/8009.pdf

This study says that some species of turf grass can tolerate up to 2000 ppm of salt applied via irrigation if the drainage of the soil is high and the soil can be flushed out periodically to clear salt deposits. Since you are at 2600 ppm and you do not have a “clean” source of water to flush the salt out of the soil periodically, I would say that the answer is no. That level of salt in your well water is not good for lawn irrigation.

Here is an article from MSU on water salinity: https://www.canr.msu.edu/news/irrigating_with_saline_groundwater

The link to the Colorado State article called out in the MSU article does not work. Here is the correct reference. On the last page, pay close attention to the concentration of chloride that will cause damage to plants. You are well over those concentrations.

https://extension.colostate.edu/topic-areas/agriculture/irrigation-water-quality-criteria-0-506/

Instead of your well water, you could possibly use rain water, rain barrels, or ground water if available.

You could also plant a trail plot of lawn this summer and see what your results are. Establish a small patch of lawn using a cool season turf grass that exhibits salt tolerance. Water it this summer with your saline well water. See how it survives the summer and see how it overwinters. If the test goes well, you might be able to plant that species in your whole lawn and have success. You can find grass species that are tolerant to salt water irrigation in Table 1 of the following site:

https://content.ces.ncsu.edu/irrigation-water-quality-problems