Explanation:

Water plus cities

• Under the Swachh Bharat Mission (Urban), the cities of the country are tested on the basis of various cleanliness parameters.
• It has categories of ODF+, ODF++ and Water+.
• The Water Plus certificate is awarded to cities that have met all the ODF Double Plus standards.
• Also, the residual sewage from residential and commercial establishments is released into the environment only after treatment. Reuse of treated wastewater should also be ensured.
• Indore, which has been ranked number one in cleanliness four times in the country, has been declared as the country's first 'water plus city' in the results of Swachh Survekshan, 2021.

Hence only statement 1st is correct.