Water Pollution Crossword

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Across
  1. 1. what are used to kill pathogens in the tertiary treatment of sewage (which is not present in all sewage treatment plants)
  2. 4. federal guidelines for building construction required installation without this harmful metal, in order to reduce the risk of it entering water systems
  3. 6. sewage treatment plants are allowed to pump this into nearby bodies of water during period of intense rainfall
  4. 8. this is a compound found in plastics that can cause cancer if ingested.
  5. 9. this metal is carcinogenic and exists naturally in groundwater
  6. 10. an increase of bacteria in waters will also increase this
  7. 11. the abundance of nitrogen and phosphorus in a body of water will increase fertility and lead to this
  8. 15. additives to increase pesticide effectiveness that are often harmful are called this
  9. 19. these organisms are used in the second stage of sewage treatment to break down organic materials
  10. 21. nothing can survive in this part of the water (if it develops)
  11. 22. these materials are human-made and can be toxic, cause genetic defects, and interfere with growth and development
  12. 24. this is known as the worst oil spill of all time
  13. 25. these are used to filter septage from septic tanks
  14. 26. water is known as a…
Down
  1. 2. this is the lowest layer of a septic tank, consisting of solid waste material from wastewater
  2. 3. sonar and loud noises can lead to this action by whales and other marine animals
  3. 5. this military compound used for rocket fuel can pollute soil and groundwater resources, reducing the production of hormones in animals
  4. 7. smokestacks can lead to this dangerous event that reduces the pH of water bodies
  5. 12. this is caused by thermal pollution
  6. 13. what pollutant caused pelican populations to go down because of thinner egg shells?
  7. 14. the burning of fossil fuels and coal produce over two-thirds of this material, which can damage the central nervous system of humans (specifically children)
  8. 16. this is the name of the most prominent indicator species of coliform bacteria
  9. 17. heavy sedimentation in water can cause this, which makes it more difficult for animals to survive
  10. 18. this was established by the Safe Water Drinking Act, which focused on pollutants in drinking water
  11. 20. large amounts of animal waste from farmlands drain to these areas, which usually lead to groundwater pollution due to the direct interaction with soil
  12. 23. runoff from a suburban community that