Green Pools
Today green pools are more common than a few years ago. As an owner or tenant of the property, you are responsible for maintaining your pool in a clean & healthy condition. Unmaintained swimming pools are a tremendous breeding source for mosquitoes. If larvae are present in a green pool, chlorine will not kill them. Professional assistance is needed to prevent larvae from becoming adult mosquitoes. A small puddle that holds water for seven days is a potential breeding source for mosquitoes.
To report a green swimming pool, contact your local code enforcement. 
Links:
https://guardianpoolfence.com/swimming-pool-regulations-california/
https://guardianpoolfence.com/swimming-pool-regulations-california/