This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Relating to, consisting of, or containing salt water: a saltwater solution.

adj. Inhabiting or occurring in seawater or salt water: saltwater fish; the saltwater crocodile.

adj. Done or used in salt water: saltwater fishing; saltwater lures.

adj. of, relating to, containing, inhabiting, or used in salt water

n. salt water; brine

n. water containing salts

"Few countries in the world face as immediate a threat from climate change as the Republic of Maldives, a low-lying group of atolls in the Indian Ocean whose coastline is eroding and whose water supplies are now being infiltrated by saltwater from the sea."

water    h2o   

red tide   

marine    seawater   

Potter    Trotter    blotter    cotter    dotter    hotter    imprimatur    mater    otter    plotter   

fresh-water    salt-water    seawater    marshy    saline    reedy    landlocked    tidal    sewage    coastal