Pimmit Run Falls is a stretch of rapids on Pimmit Run in Arlington County, Virginia, in the Northern Piedmont region. It lies about 0.9 miles south of Brookmont and roughly 3.4 miles north of Arlington as the crow flies.
The Northern Piedmont is rolling upland of farmland, oak forest and suburbs from Pennsylvania to Virginia, with waterfalls at the fall line and on rocky creeks crossing diabase and gneiss.
It is the only recorded rapid in Arlington County. Little Falls, 7 feet high, is under a mile away across the state line in District of Columbia. Stubblefield Falls, is about 5 miles away across the state line in Maryland. Calico Falls, is about 5.8 miles away across the state line in Maryland.
Pimmit Run Falls is located at 38.9286° N, 77.1174° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this rapid yet.