A year ago environmentalists to a man/woman were blaming Big Sugar for the lion's share of Indian River Lagoon pollution, pooh-poohing the devastating effect of human waste leaking from the land. Actually, many of them still are. But times have changed. Florida rivers and estuaries have come under greater scrutiny. Now, through more concentrated scientific study, we understand what a threat septic tanks and faulty sewage pipes are to the quality of our waterways.