A 2013 survey revealed that there are about 1700 volunteer water monitoring programs that operate in the United States. This includes “parent” programs shown on the map above, and numerous local efforts that use methods of those parent programs (e.g., there are hundreds of Stream Teams that use the Missouri Stream Team methods).
This map is updated about every other year. The last check on contacts was made in late 2019 and early 2020, with the updated map posted in April 2020. Previous checks were made in 2015 and 2017. Click on the link that follows to access the 2020 USA Volunteer Water Monitoring Programs map or on the map image above. The 2020 map displays 284 programs. These support about 1400 local programs that use their methods.