Water quality standards

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Across
  1. 4. The presence of these bacteria indicates fecal contamination and must be absent in 100ml of water. (9, 7)
  2. 5. (POTABILITY): The term for water that is safe for human consumption.
  3. 7. (COPPER): While an essential nutrient, excess copper from plumbing can impart a bitter, metallic taste to water.
  4. 8. This unit is used to measure the cloudiness of water. Its acceptable limit is 1 NTU. (9)
  5. 10. (TOTALDISSOLVEDSOLIDS): TDS is a general indicator of water quality and taste. High TDS water tastes brackish or salty.
  6. 11. The acceptable limit for this ion is 1.0 mg/L. Beyond this, it can cause brown staining of teeth. (8)
  7. 12. A measure of the acid-neutralizing capacity of water. (9)
  8. 13. This gas, used for disinfection, has a residual limit of 0.2-1.0 mg/L at the consumer end. (8)
  9. 14. (ALKALINITY): Important for controlling the pH of water and preventing corrosion in pipes.
  10. 15. The process of killing harmful microorganisms in water. (11)
  11. 16. – WATER QUALITY EVENT 2025 CROSSWORD
  12. 17. (ARSENIC): A notorious groundwater contaminant, especially in parts of West Bengal and Bangladesh, which is highly toxic and carcinogenic.
  13. 19. (CHLORINE): The most common disinfectant used worldwide. A residual amount is maintained in the water distribution system to prevent recontamination.
  14. 20. (THERMOTOLERANTCOLIFORMS): This group, including E. coli, is the primary indicator that water has been contaminated with fecal matter and may contain dangerous pathogens.
  15. 22. of Clues
  16. 23. (BIOCHEMICALOXYGENDEMAND): BOD is a measure of the amount of organic pollution in a water body. High BOD means more pollution.
  17. 24. The amount of oxygen consumed by bacteria while decomposing organic matter in water. (8, 5)
Down
  1. 1. (FLUORIDE): An element beneficial in small amounts for teeth but causes dental fluorosis at higher concentrations.
  2. 2. This term describes water that is safe and pleasant to drink. (9)
  3. 3. (NITRATE): Often from agricultural fertilizer runoff or sewage. It is particularly dangerous for infants.
  4. 4. (IS10500): The core standard number every water quality professional in India should know.
  5. 6. 2. FLUORIDE, 4. ARSENIC, 6. TURBIDITY, 8. DISINFECTION, 9. CHLORINE, 11. IS10500, 12. COPPER, 13. TOTALDISSOLVEDSOLIDS
  6. 7. A common metal, with a permissible limit of 0.03 mg/L, that can leach from pipes and cause a metallic taste. (6)
  7. 8. (TURBIDITY): A key measure of water clarity. High turbidity can hide pathogens and protect them from disinfection.
  8. 9. The BIS standard number for drinking water specification. (2, 7)
  9. 11. The acceptable limit for this nutrient, which can cause "blue baby syndrome," is 45 mg/L. (7)
  10. 12. This highly toxic element has a permissible limit of 0.05 mg/L and is often found in groundwater. (7)
  11. 14. This heavy metal, with a limit of 0.01 mg/L, is a neurotoxin found in old plumbing. (4)
  12. 15. (DISINFECTION): The critical final step in water treatment to ensure the water is free from harmful pathogens.
  13. 18. (LEAD): A dangerous heavy metal that can cause severe developmental and neurological problems, especially in children.
  14. 21. 1. THERMOTOLERANTCOLIFORMS, 2. NITRATE, 3. POTABILITY, 5. ALKALINITY, 7. LEAD, 10. BIOCHEMICALOXYGENDEMAND
  15. 23. This parameter measures the total concentration of dissolved inorganic salts. (3, 8, 6)