Salinification of groundwater is a likelihood with intensification. Robert O. Braaten and Mark Flaherty 2001. Salt balances of inland shrimp ponds in Thailand: implications for land and water salinization. Environmental Conservation 28(4):357-367
Thanks for your nice query. I am agree with the answer of Michael A Rice. In addition of salinization of ground water, residual seepage of chemicals and antibiotics, heavy metals (non-biodegradable) may be an important issues (on the basis of oral consultation with Experts in Bangladesh). Any way accumulation of acid-sulfate soil (particularly in Bangladesh) may also keeping in mind concerning leaching.