Salt water is only used as a last resort.
Link: https://www.msn.com/en-us/weather/topstories/why-doesn-t-la-just-put-the-fires-out-using-ocean-water/ar-BB1ro9nF?ocid=msedgntp&pc=DCTS&cvid=a397a44c1c3647a69223548a54cf8cd3&ei=32
Salt water is only used as a last resort.
Link: https://www.msn.com/en-us/weather/topstories/why-doesn-t-la-just-put-the-fires-out-using-ocean-water/ar-BB1ro9nF?ocid=msedgntp&pc=DCTS&cvid=a397a44c1c3647a69223548a54cf8cd3&ei=32