A recent civil grand jury report on Marin’s sewer systems describes “unacceptable” levels of sewage spills and aging infrastructure that will likely require the replacement of hundreds of lines of pipe in the near future. The jury undertook the report, “The Scoop on Marin County Sewer Systems,” because of the amount of taxpayer money—about $77 million, or half of property tax and fee revenues—that goes toward sewer services. Although the primary goal of most sewer…