To develop an integrated wastewater treatment system, the residents of Arcata collaborated with the biologists of which University?

Humboldt State University.

Wastewater including sewage can be treated in an integrated manner, by utilising a mix of artificial and natural processes.

An example of such an initiative is the town of Arcata, situated along the northern coast of California.

Collaborating with biologists from the Humboldt State University, the townspeople created an integrated waste water treatment process within a natural system.