The rivers emptying into the Bay were also used by the colonists to dispose of raw sewage. By the middle 1800s some of the rivers feeding the Bay were polluted: the Potomac was recorded as emitting a lingering stench. The first sewer was constructed in Washington, DC, and it pumped untreated waste into the Bay. It was recognized in 1893 that the diseases suffered by humans consuming shellfish from the Bay were directly related to the discharge of raw sewage into the Bay. Despite this recognition, efforts in 1897 by the mayor of Baltimore to oppose the construction of a sewage system that discharged sewage into the Bay in favor of a "land filtration technique" failed. Ultimately, a secondary treatment system discharging into the Bay was constructed. In the mid-1970s, a $27 million government-funded study of the Bay's condition concluded that the deteriorating quality of the Chesapeake Bay was a consequence of human impacts. But it was not until the early 1980s that an Environmental Protection Agency (EPA) report on the Chesapeake focused interest on saving the Bay, and $500 million was spent on cleanup and construction of sewage treatment plants.
While the Chesapeake Bay is used primarily as a transportation corridor, its natural resources rank a close second in importance to humans.
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