As stated above, there is no official "PEP" list. Generally speaking, if you are dealing with a U.S. citizen, you usually don't have to be concerned about a potential PEP unless you know that your customer is the spouse, child, relative or paramour of a powerful foreign dignitary.
How would you know? Well - extreme amounts of money flowing through their accounts would be one tip-off. Also, extravagant clothes, jewelry, cars with no domestic support would be another.
If you are dealing with a non-resident alien, part of your account opening procedures would be to simply ask:
Are any of your parents or relatives an elected official or hold a politically appointed position in a foreign country?
Beyond that - the issue with PEPs is that they can aid in looting the treasury of a country, or skimming taxes or foreign aid money, etc. Now if they do that, you would see some significant amounts going through their account, and the explanations probably won't add up. So it all goes back to KNOW THY CUSTOMER and UNDERSTAND what their business is, how they earn their money, and so on.
There is no magic bullet to this, but a lot of this is just common sense and listening to your gut, or that funny feeling, or the hairs prickling on the back of your neck.