A reputable builder (if you can find one) will want a soil test if there is any question. Then a pad can be built or piers can be sunk as appropriate. Just remember, when we get a hurricane, water can rise pretty high even on flat land. Build as high as possible and with an eye to possible sources of runoff. Also, look at the flood maps to be sure you are in an area of "least concern".
4 acre pond 32 ft deep within East Texas (Livingston) timber ranch. Filled (to the top of an almost finished dam) by Hurricane Harvey 9/17. Stocked with FHM, CNBG, RES 10/17. Added 35lbs RSC 3/18. 400 N LMB fingerlings 6/18
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