Map of sites around the creek
Context 1652 Clean Water Hub sites with surveys lie within 30 km of the chapter; the long-record ones cluster to the southwest, across the Potomac.
The tested sites, mostly Fairfax County streams scored on the Virginia form, sit 14 to 30 km away across the Potomac. On the Maryland side, nearby sites mostly carry salt and nitrate readings. Open any dot in Google Maps to see the stream, the roads and the land around it.