Years ago I asked about waste in DR and was told it was very difficult to install sewage systems 9or septic systems) due tot he rock the island is comprised of I have no personal knowledge but how does the majority of these new buildings handle waste I remember years ago seeing "fresh" waste rushing out pipes into the sea on the Malecon, I hope that has changed
I have no idea who gave you the answer you refer years ago, and ignore the basis for your allegation of raw sewer getting dumped in the sea.
I already gave you the answer to how waste water is handled in SD in most cases (see my previous post on this). Is excavating difficult? Perhaps. But for crying out loud don't you know that to make the FOUNDATION of a tall building they already have to make a lot of excavating (in rock or whatever)? The towers may also include large underground useful areas, such as for a parking garage, which also require excavating. Why would they find excavating for a septic tank a lot more complicated than doing so for the foundations or the parking garage, or anything else?
And more importantly, why would the investors shelling out (tens of) millions of USD for a major construction be stupid enough NOT to demand a reasonable engineering solution to the waste water problem? They should know that failing to include such solution would reduce significantly the value of their investment, and may potentially make it completely worthless. They can't be that STUPID and stay in business, can they?
Finally, the allegation of raw sewer dumping in the sea is probably a confusion between WASTE water and RAIN water. A city has typically a system to handle rain water (alcantarillado pluvial) which is different from the waste water system (alcantarillado sanitario). It is perfectly reasonable to design the RAIN water system in such a way the rain water goes to the sea, since that it precisely what NATURE intends.
Dumping waste water into the sea is a totally different matter, which should lead to strong protest by those more directly affected, which may include deep-pocket business interest such as major hotels by the shore, and many involved in the tourist business, which have a strong financial incentive to prevent such practice.