Sewage Pollution in Malaysia

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Across
  1. 4. Premises discharging sewage require this before operation. (9 letters)
  2. 5. Insufficient removal of this leads to environmental issues. (8 letters)
  3. 6. Malaysian act regulating sewage discharge. (3 letters)
  4. 7. Lack of this is a major public issue in tackling sewage problems. (9 letters)
Down
  1. 1. A term for over-fertilization of water bodies due to sewage. (14 letters)
  2. 2. High levels of this nitrogen compound (NH3-N) degrade river ecosystems. (7 letters)
  3. 3. A health crisis caused by waterborne diseases. (8 letters)
  4. 4. Sewage increases this in water, leading to algal blooms. (9 letters)