Citizen science projects tend to attract white, affluent, well-educated volunteers − here's how we recruited a more diverse group to identify lead pipes in homes

"Recruiting participants for a citizen science project produced a more diverse group when people were signed up through partner organizations, such as schools and faith-based organizations, than when they joined on their own. We used this approach to recruit volunteers for Crowd the Tap, a citizen science initiative that crowdsources the locations of lead plumbing in homes.

We signed up 2,519 households through partner organizations, in addition to 497 households that signed up on their own. We recruited households from all 50 states, though the majority came from North Carolina. Our project was initially funded by the Environmental Protection Agency, which led to nationwide sampling, but additional funding from the North Carolina Water Resources Research Institute led to prioritizing sampling in North Carolina.

We recruited 2.2 times more Black participants and 2.3 times more Hispanic or Latino participants through partnerships than we did through individual sign-ups. This allowed us to assemble a group of volunteers that more accurately represented the U.S. population. In addition, 11.2 times more lower-income participants took part in Crowd the Tap through partner organizations than on their own...."