Napa Sanitation District Harvests Napa’s Sewage Sludge for Fertilizer

Dredging is common in navigable waterways, but the project underway at the Napa Sanitation District property in southern Napa County is a little bit different.

The dredging is taking place in a vast sewage treatment pond. And the material being removed is biosolids, which is another way of saying sewage sludge.