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In a typical septic system, waste from the house enters the tank, the solid waste settles to the bottom and the water goes to the drain field to be clarified. But when sea levels rise it interferes with that process, and the drain field mixes with groundwater and the septic tank fails.

That means waste from a toilet can go directly into the groundwater.

The Miami Dade Water and Sewer Department tells ABC News they have identified 10,000 tanks today that are not high enough anymore, and in 20 years, that number will reach 50,000.

Lynskey explained they are not just focused on septic, they're also concerned about the canal systems keeping South Florida from turning back into a swamp. As sea levels rise, the canals pick up more trash, nitrogen and phosphorus from fertilizer used on farms and lawns and carries it right into Biscayne Bay.

\"PHOTO:
Daniel A. Varela/Miami Herald via AP, FILE
PHOTO: In this Aug. 12, 2020, file photo, trash and dead fish float on the surface of the water in Downtown Miami, on Biscayne Bay.
>

But there is cause for hope.

Tampa Bay faced a similar challenge in the 1970s when the water was so covered in algae the seagrass died and fish and wildlife was driven out. After decades of effort to prevent polluted water from entering the bay, the seagrass has returned to nearly the same level as 1950, an area the size of Manhattan.

But Miami Waterkeeper said the city needs big changes in its sewage infrastructure to prevent more fish kills and preserve the bay.

\"So we urgently need to be doing these investments and taking these opportunities we have to retrofit how our city is built and how it functions to be ready for sea-level rise,\" Silverstein told ABC News.

The city of Miami agrees the problem is serious, but Lynskey said local leaders haven't agreed on a path forward. The department is in the process of raising key infrastructure as high as 20 feet above sea level to reduce risk.

\"Nobody's come up with a magic bullet, we've already built billions of dollars of buildings and infrastructure. How do we make those survive? We're still very much grappling with all that,\" Lynskey said.

He said that as the sea level continues to rise tough decisions may have to be made from expensive septic tank replacements to decisions on whether to relocate.

\"I think over the next 15 years, people are going to have to make some fundamental decisions on whether we're going to try to keep every inch of land that humans live on, or are there some properties east of the ridge, where ultimately we retreat from and politically, I don't think we're there yet, but behind the scenes you can hear the conversations,\" Lynskey told ABC News.

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