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Across 4. Crab species native to the Chesapeake Bay 6. Largest source of nitrogen pollution in the Bay 10. __________ Sanitation Authority; upgraded treatment system in order to reduce nitrogen levels 11. Unit of measure for nitrogen concentration 12. A multi-state agreement to make an effort to improve the Bay by 2010 14. The nation's largest and most productive estuary 16. Acronym for the Chesapeake 2000 agreement 17. Decreases in a watershed as a result of algal blooms 19. CBF 20. Number of Bay residents whose wastewater is treated and released into the Bay

Down 1. EPA 2. Delineates the point at which the Bay switches from fresh to salt water 3. The ___________ River is the tributary that contributes the most nitrogen to the Bay 5. STP tank in which nitrates are stripped of their oxygen 7. Many of the Chesapeake's tributaries were put on this list in 1998 8. Accompanies nitrogen as a pollutant nutrient in the Chesapeake Bay 9. Second largest source of nitrogen pollution in the Chesapeake Bay 13. Breakdown of nitrogen and amonia into nitrates 15. STP discharge is a _____ ______ pollutant, and therefor can easily be addressed 18. An area with little to no dissolved oxygen