Reading Comprehension — quick quiz

Read the passage and answer the question: Water conservation has become increasingly critical in modern times. With growing population and industrial demands, traditional water sources are under severe stress. Rainwater harvesting offers a sustainable solution by collecting and storing rainwater for future use. This method not only reduces dependence on groundwater but also helps in recharging aquifers. Many cities have now made rainwater harvesting mandatory for new buildings. According to the passage, what is the primary advantage of rainwater harvesting?