also - not seeing leaky pipes doesnt mean there isnt a break...it could be outside and the water just coming in under your foundation into basement. we did a job where a lady left her hose connected and turned on (no water coming out since she had a nozzle on it)....well it froze and the hose itself cracked and water began flowing out and did the same thing youre describing....flooded basement over night and ruined sump pump....shut off hose bib, disconnected hose, drained basement, replaced pump....good to go i would say rent a pump and pump out your basement, then try and diagnose your water problem (examine the ground outside to see if theres any puddle spots, etc)....once you find your water problem you need to dig it up and repair it, then replace the sump pump also, if it helps, homeowners insurance will usually cover these repairs. youre a little far away for us to do the job...its a 1 day job, but you never know what could come up many things can cause a water line break...most common is ground freezes, rock rubbing on water line (water lines move underground when you turn them on and off), and the foundation of your house settling (house goes down, water line doesnt...break)