Triclosan is the usual antibacterial element in most soap. Several concerns about its use.
1. bacterial mutation and consequently resistance
2. build up in humans, concentrating in cells, liver, nervous system
3. more drying than ordinary soaps
4. gray water run off and direction of the antibacterial chemical
a. affect soil micro health,
b. ultimately in our food

When we attempt to circumvent natural or centuries-tried remedies by inventing chemical shortcuts such as ddt, synthetic hormones, etc., we humans and the earth lose.

A few links and some excerpts to review re antibacterial soap

https://www.healthatoz.com/healthatoz/Atoz/common/standard/transform.jsp?requ...
Perencevich says washing with regular soap and warm water is still one of the best ways to fight germs.

http://www.faulkingtruth.com/Articles/GlobalWarning/1056.html
...In fact, I have discovered it is increasingly difficult to find any soap that isn’t antibacterial. I spend hours scouring the stores, looking for soap...In addition to the problems described above, there is the problem of “normal flora”.

http://forums.gardenweb.com/forums/load/drought/msg0817514428619.html?13

http://www.motherearthnews.com/Nature_and_Environment/2006-10-01/Green_Gazett...
According to recent studies, antiseptic ingredients added to numerous products are not effective and may actually be harmful.

http://www.mercola.com/2006/oct/26/the-toxic-waste-of-antibacterial-soaps.htm
In addition, researchers have determined that about 75 percent of a popular antimicrobial, triclocarban (TCC), resists water treatments meant to break it down and ends up in surface water and in municipal sludge used as fertilizer. TCC is known to cause cancer and reproductive problems.

http://www.mercola.com/2000/jun/17/anti_bacterial_soap.htm
American Medical Association (AMA), although they stopped short of recommending that people avoid using the popular soaps, lotions and mouthwashes...A trade group, the Cosmetic, Toiletry and Fragrance Association, had previously lobbied the AMA against having any position on antibacterial products.

http://www.newstarget.com/017804.html
Warning: Toxic chemical triclosan can turn your toothpaste into chloroform
Monday, February 13, 2006 ... The manufacturers of products that have triclosan in them keep saying that it is perfectly safe and that it only affects the nervous systems of various organisms.