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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1The 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