Across
- 4. is a good solvent
- 10. is added to water supplies to help prevent tooth decay
- 11. a measure of the cloudiness of water that is caused by suspended solids
- 14. removes harmful bacteria and other microbes
- 15. scientists can now test water with this
- 17. where wastewater is cleaned and filtered before being released back into the environment
- 18. is often added to kill microbes left in the water
- 19. stir the water in the basins
- 20. are added that make suspended particles stick together
- 21. may be unsafe for humans to drink
Down
- 1. depend on the intended use of the water
- 2. can be done by trained workers or trained volunteers
- 3. main federal law that ensures safe drinking water for people in the United States
- 5. has the job of enforcing this law (the Safe Drinking Water Law)
- 6. drinking water is often mixed in these to help remove chemicals and harmful organisms
- 7. the identification of harmful bacteria, viruses or protists in water
- 8. a measure of the amount of ions or microscopic suspended solids in water
- 9. water that is suitable to drink
- 12. of water are routinely taken to make sure the water quality meets the standards required by law
- 13. take out large debris
- 16. a measure of how acidic or alkaline water is