Public Health Inspectors - Urban Planning and Development

I am reading an article on Public Health Inspectors and their role in urban planning and development, and how they need to be active when City planners are planning developments.  I am wondering if an OTA can give me their perspective on what they think the role of an Public Health Inspectors should be in urban planning and development.

This is an interesting and hot topic where I am from.  So fresh perspectives are always great.  Plus, with the way the instructor is going with the class, I can totally see this being a long answer type question on my midterm or final.

I appreciate all of your help. I have an included a link to a website that identifies what urban sprawl is (http://www.publichealthgrandrounds.unc.edu/urban/),