Across
- 6. principle law governing pollution control in the Nation's waterways
- 7. the removal of biodegradable organic matter and suspended solids through the processes of aeration and filtration
- 9. rapid increase/accumulation of algae in a body of water due to excess nutrients
- 14. sewage is stored in a basin where solids settle to the bottom and oil and lighter substances rise to the top
- 19. a single identifiable source of pollution
- 20. reduced level of oxygen in the water
- 21. sets standards for drinking water quality and monitors states, water suppliers, etc. who enforce those standards
Down
- 1. bacteria that can grow and live when oxygen is present
- 2. excess of nutrients in water, typically from runoff
- 3. the amount of oxygen that is present in water
- 4. water testing method used to determine active fecal waste amount
- 5. natural chemical found in soil, air, and water; major fertilizer
- 8. runoff from rain and snow melt bring pollutants into water
- 10. wastes that can be decomposed by oxygen-requiring bacteria
- 11. amount of dissolved oxygen measured at specified distances from a pollution source in water
- 12. a bacterium, virus, or microorganism that causes disease
- 13. large collection of trash located in the central North Pacific Ocean
- 15. the final stage of the multi-stage wastewater cleaning process; removes inorganic compounds, bacteria, viruses, and parasites
- 16. an element that provides a quarter of all necessary nutrients for growth
- 17. bacteria that can grow and live when oxygen is not present
- 18. underground sewer through which domestic wastewater flows for sewage treatment