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The cost to reduce the nitrogen St. Mary’s County residents discharge into the Chesapeake Bay could reach $143.6 million, a work group told the county commissioners Tuesday.
That was the group’s estimated price for an upgrade of all 26,071 septic tanks in the county.
But upgrading all of those septic tanks wouldn’t be enough to meet federal standards set to improve the health of the Chesapeake Bay. Some neighborhoods on septic tanks would have to bear the cost of connecting to public sewer, the work group said.