Sewage water tends to be high in salt. Especially in a desert where there is high evaporation and low rainfall, irrigating with this type of water increases soi

Sewage water tends to be high in salt. Especially in a desert where there is high evaporation and low rainfall, irrigating with this type of water increases soil salinity, eventually to the point where it is toxic to native plants and most crop plants. They will get greenery and good growth for a while, and then as salt accumulates over the years, the plants will start dying and they will have poisoned the soil to the point where almost nothing will grow on it anymore. Great PR, but in the long term, it’s a lousy idea. We have many decades of knowledge on how salination plays out in desert agriculture.