The California Report

Nitrates in Our Drinking Water, Part 3 - Cleaning up the Past
Over the past several days, we've brought you stories about drinking water contaminated with nitrates. They're byproducts of fertilizer, dairies and septic tanks -- and they affect wells serving millions of Californians. In the final installment of our series, we learn about some of the challenges facing cities and towns trying to clean up the problem.