We at Sauf Haus believe in Reinheitsgebot and Biergesetz.
The Reinheitsgebot, (literally "purity order"), sometimes called the "German Beer Purity Law" or the "Bavarian Purity Law" in English, is a regulation concerning the production of beer in the Holy Roman Empire and its successor state, Germany. In the original text, the only ingredients that could be used in the production of beer were water, barley and hops.
The law originated on 30 November 1487, when Albert IV, Duke of Bavaria promulgated it, specifying three ingredients – water, malt and hops – for the brewing of beer. Later, in the city of Ingolstadt in the duchy of Bavaria on 23 April 1516, two other dukes endorsed the law as one to be followed in their duchies, adding standards for the sale of beer.

So come enjoy 16 German drafts on tap all the time in the heart of Dupont Circle.