High levels of salinity in water and soil may cause: corrosion of machinery and infrastructure such as fences, roads and bridges. poor health or death of native vegetation, leading to a decline in biodiversity through dominance of salt-resistant species, potentially altering ecosystem structures.
Increasing salt concentrations on the water supply and water duty leads to increasing salinity. The suitability of using water for different purpose(drinking , irrigation or other ) depends on water salinity (Electric conductivity of water ) according to FAO and WHO guidlines.
First and for most what purpose will it have for water supply and duty. Now to the question: it will increase salinity and high electrical conductivity, which in turned affect the water infrastructural facilities made with metals. My opinion on the asked question for modification: The effect of salt concentration on water supply and water duty.