Why is rainwater released untreated?

Sewage is expensive to treat. Rainwater is much cleaner than sewage. To help prevent sewage treatment plants that treat millions of gallons of raw sewage daily from being overwhelmed during rain events and spilling contaminated sewage into the environment, most stormwater in cities around San Diego County, including Coronado, either freely flows or is piped directly to the local receiving waters. 

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1. Why does the City of Coronado have separate sanitary sewer and storm drain systems?
2. Why is rainwater released untreated?
3. Why can't storm drain water be sent to Point Loma to be treated?
4. What does the City do to limit pollutants in storm water runoff?
5. What else does the City do to keep our ocean and bay clean year-round?
6. Why is there a flooding issue in the Country Club Estates area? What makes it different?
7. What has the City done to deal with the minor flooding in Country Club Estates?
8. Besides the City, who monitors the storm drain system?
9. What safeguards do our sewer and storm water systems have to prevent failures?
10. What can residents do to help keep our waterways clean?