All stations receive a wide variety of "PSA's". They come from 3 general sources:
1) - legit PSA's from non-profit organizations and government agencies such as "Habitat For Humanity", the "USO", "EPA" etc.
2) - Industry-group PSA's, suggesting that you "see you optomitrist if you notice signs of eye problems, etc"; where those industry groups may be non-profits, but their sole purpose is to gain more business/wealth for FOR-profit members (optomistrists). - Another example: A lawyer group promoting adoption... "yes, you CAN adopt. Contact the (non-profit)Cleveland Adoption Center" -which is a front for FOR-profit adoption lawyers." Such lawyers often hold monthly seminars. - The purpose of that is for lawyers to drum up business at no cost for them to advertise, thinking that radio and TV stations will fall for their non-profit front-orgainzation PSA's. Most stations don't (not to mention that most stations don't air many PSA's in the first place!).
3) - Religious PSA's. While no one would argue against the fact that they are classified as non-profits, they often promote kindness to fellow man and/or positive thoughts of family life ('traditional' family, of course), their tag-line at the end is "brought to you by..... (The Church of the Gooey Death & Discount House of Worship)". Only NOW, with Mitt Romney running for president does it turn into a political issue when a MORMON Family-Is-Wonderful-PSA airs. The Mormons have been making radio and TV PSA's for decades.