I deinstalled my old dishwasher as I getting a replacement. The supply line has been dripping ever since. I double checked the supply line was firmly closed and tightened the nut from the water supply to the dishwasher nut - but still leaking - help!!

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    The valve probably has calcium buildup, sometimes opening and closing will clear it, not always tho.
    – Tyson
    May 20 '18 at 16:03

Supply valve is not fully shutting off.

Consider replacing it.

If that is not a task you wish to do now get a plug for the line to temporarily stop the drip until new DW is installed

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