I have been lurking on your forum and am blown away by your expertise! So, I am turning to you for some much needed advice! We are in the midst of purchasing a pre existing ICF construction green home. It is two years old and built by reputable green builders. You can imagine our surprise to find water in the basement upon walking through three weeks ago after some MAJOR rain. The gutters WERE indeed clogged at the time so no doubt this came into play. I know that Tremco Watchdog spray on waterproofing had been applied after construction...wouldn't this have stopped any leaking? Also, the sump pump was not properly hooked up at the time so that was a factor as well. Nonetheless, it is all very unsettling as we have not yet closed on this home. The builder is no longer involved in the sale(long story) and we are now "negotiating" with a seller who knows very little about green homes as he had just bought the home from the builder to resell which is why the house has been vacant/uncared for in the last two years. WHAT should we do? We are admittedly very "green" when it comes to green technology and want to avoid costly mistakes!!! Also, we are very curious if the water could have come through where the geothermal lines enter the foundation/basement wall? When we looked closely it seemed as if it could have been the point of entry for the water. Thank you in advance for your replies!

This may or may nt be a problem. If the gutters are draining down the wall the water level will raise above the floor level. You must get the away from the foundation, then the problem should sub-side.

Basement water problems are sometimes the most difficult problems to solve in all construction. Without much more info, an accurate prognoisis is all but impossible. An onsite evaluation by an experienced pro is absolutely necessary before you close on this house.
First, the problems you mentioned, gutters and sump pump, must be addressed by the current owners, now.
Then hope for heavy rains, to see if these repairs have helped the problems. Also, some water problems can come and go, being a major problem today and then disappearing for months, before reappearing. Unless, you can see a specific cause for the problem, do not assume that your first remedy will repair the problem 100%.
Also, before closing on the property, contact a local construction defect attorney, and see who is responsible for repairs and remediation should you go ahead with the purchase.

Thanks to those who replied! To update, an inspector was out today and suspects he found the cause(gutters) but is concerned about mildew now! They are going to drill into the wall and test further. Better on their dime than ours, right?