Alas, you've hit on a sore spot in the business. Most areas have an MLS, with two types of access. 1) Members can access several dozen different data fields, in many cases including information on lot size, and availability of public water and sewer. 2) The general public can only access a subset of that information, and in many cases that subset won't include things like public water and sewer availability.
Please don't ask why that is :) as the answer gets pretty quickly into industry politics.
You can sometimes do an end-run around restrictive MLS's by looking up county records, which in many cases are available online.