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 2022 and early 2023, with the most recently updated map posted on February 5, 2023. Previous checks were made in 2015, 2017, 2019/2020. Click on the link that follows to access theĀ 2023 USA Volunteer Water Monitoring Programs map or on the button above. The 2023 map displays 288 programs including 23 new listings. These are estimated to support about 1400 local programs that use their methods.

Suggested reference if citing directory: Stepenuck, K. 2023. United States Volunteer Water Monitoring Programs. USA Volunteer Monitoring Network. Retrieved at: