Green wastewater overflow

摘要

The rate at which sanitary sewer overflows [SSOs] are happening across north america is surging. About 19,500 sewer systems across the US handle an average daily flow of roughly 50 billion gallons of raw sewage. Sadly, these aging systems are failing to handle this raw sewage at an alarming rate. SSO reporting requirements vary from state to state, so an accurate national picture is difficult to determine. (Some states such as California and Texas have passed laws mandating the reporting of all SSOs.) It's so vague, the EPA estimates that anywhere between 23,000 and 75,000 SSOs occur each year, discharging a total volume of three to 10 billion gallons per year.