A $3 billion problem: Miami-Dade’s septic tanks are already failing due to sea rise
Miami-Dade has tens of thousands of septic tanks, and a new report reveals most are already malfunctioning — the smelly and unhealthy evidence of which often ends up in people’s yards and homes. It’s a billion-dollar problem that climate change is making worse.
As sea level rise encroaches on South Florida, the Miami-Dade County study shows that thousands more residents may be at risk — and soon. By 2040, 64 percent of county septic tanks (more than 67,000) could have issues every year, affecting not only the people who rely on them for sewage treatment, but the region’s water supply and the health of anyone who wades through floodwaters.
“That’s a huge deal for a developed country in 2019 to have half of the septic tanks not functioning for part of the year,” said Miami Waterkeeper Executive Director Rachel Silverstein. “That is not acceptable.”
Septic tanks require a layer of dirt underneath to do the final filtration work and return the liquid waste back to the aquifer. Older rules required one foot of soil, but newer regulations call for double that. In South Florida, there’s not that much dirt between the homes above ground and the water below.
“All those regulations were based on the premise the elevation of groundwater was going to be stable over time, which we now know is not correct,” said Doug Yoder, deputy director of Miami-Dade County’s Water and Sewer Department. “Now we find ourselves in a situation where we know sea level has risen and continues to rise.”
Sea level rise is pushing the groundwater even higher, eating up precious space and leaving the once dry dirt soggy. Waste water doesn’t filter like it’s supposed to in soggy soil. In some cases, it comes back out, turning a front yard into a poopy swamp.
High tides or heavy rains can push feces-filled water elsewhere, including King Tide floodwaters — as pointed out in a 2016 study from Florida International University and NOAA — or possibly the region’s drinking supply.
Neighbors on a Coconut Grove street worked with a landscape architect to come up with a list of ideas for how to keep their flooded neighborhood dry in the face of sea level rise. Now the city will decide what gets built and how it’s paid for.
In total, there are about 108,000 properties within the county that still use septic, about 105,000 of which are residential. The vast majority (more than 65,000) of the septic systems are in unincorporated Miami-Dade.
Miami Gardens, North Miami Beach, Palmetto Bay and Pinecrest have the most of any city, at about 5,000 each.
Some of those cities will see hundreds more septic tanks experiencing yearly failures within the decade, like North Miami Beach, which has 2,780 homes with septic tanks with periodic issues now. By 2030, that is expected to jump to 3,751.
The report did not forecast past 2040, when the region is expecting around 15 inches of sea rise, a number that is predicted to creep exponentially upward over the decades.
“The best response is sewer extension, but obviously that infrastructure takes quite a bit of planning and time,” said Katherine Hageman, the county’s resilience program manager.
“And money,” County Chief Resilience Officer James Murley added.
Ripping out every septic tank and laying down new pipes to connect the homes to the county’s sewer system won’t be cheap. The latest estimate put the price tag at $3.3 billion.
“Who has that?” said Commissioner Rebeca Sosa, who called for the study. “We need to act as fast as possible. We need to get as much assistance as we can from the federal government, from the state.”
That $3.3 billion price tag doesn’t cover commercial properties, an estimated $230 million cost, Yoder said. The county’s current general obligation bond includes $126 million to extend sewer services to businesses. Yoder said the plans are in the design phase.
For now, anyone who wants to connect their property to the county’s sewer system has to pay out of pocket. The report cites the average price as $15,000, but Yoder estimated that in septic-reliant areas like Pinecrest, it could cost around $50,000 per home to tap into the sewer system.
That’s cash most residents don’t have on hand, Haggman said, which is why the county is exploring other ways to help residents out.
“We have options, but I think that’s a good area for more conversation,” she said.
Besides borrowing more money with another bond, the report pointed out the county’s best options would be continuing to collect the per-home fee or establishing special taxing districts and spreading the cost into a neighborhood.
Silverstein said the findings raise significant concerns about impacts from septic tanks not just in 20 years, but now.
“Clearly the county is facing a major system failure here. Septic tanks are already compromised and will continue to be even more comprised with sea level rise and they need to take rapid action to address this and make the system more resilient,” she said.
Miami Herald Staff Writer Jenny Staletovich contributed to this story.
Comments
Sea rise breaking Miami Dade FL septic tanks, report shows |...
FYI: Please see one of the environmental health findings of the Rising Together: Shorecrest with Community Health Mapping (2017) project.
Janice T. Booher
Rising Together: Shorecrest with Community Health Mapping (2017)
When this article is posted within the appropriate working group(s), here is a link to the referenced supporting documentation . .
Rising Together: Shorecrest, Miami
http://reacttoolkit.net/index.php/rising-together-shorecrest-miami-2017/
Rising Together: Shorecrest with Community Health Mapping (2017)
My previous reply has now been edited to reflect the correct link:
http://reacttoolkit.net/index.php/rising-together-shorecrest-miami-2017/
Sea rise breaking Miami Dade FL septic tanks, report shows |...
Hmm...I will post the map.
Jan
Janice T. Booher
Sea rise breaking Miami Dade FL septic tanks, report shows |...
Hi Kathy,
Yes. I saw the article.
I was posting information collected in a community level project in Shorecrest Miami that was funded by the UU Fund for Social Responsibility and NIH National Library of Medicine to survey residents and to map Environmental Health issues in Shorecrest, Miami. It was the Rising Together: Shorecrest + Community Health Maps 2017 project.
I posted one of the maps that was a finding regarding septic tank proximity from that project through the mail handler, because when I posted it by clicking Return, the map was not visible, but rather a blue square with a question mark in it.
It is relevant to FDRI because Shorecrest is one of the communities participating in FDRI. Shorecrest has tidal flooding from the Biscayne Bay pushing up through the Little River. Not only is partially treated sewage and sometimes raw sewage released into the Biscayne Bay during hurricanes, but the septic systems often contribute to the pollution in the Bay. Tidal Flooding makes this relevant to the environmental health of Shorecrest residents.
Jan
Janice T. Booher
Sea rise breaking Miami Dade FL septic tanks, report shows |...
Hi Kathy,
Yes. I saw the article.
I was posting information collected in a community level project in Shorecrest Miami that was funded by the UU Fund for Social Responsibility and NIH National Library of Medicine to survey residents and to map Environmental Health issues in Shorecrest, Miami. It was the Rising Together: Shorecrest + Community Health Maps 2017 project.
I posted one of the maps that was a finding regarding septic tank proximity from that project through the mail handler, because when I posted it by clicking Return, the map was not visible, but rather a blue square with a question mark in it.
It is relevant to FDRI because Shorecrest is one of the communities participating in FDRI. Shorecrest has tidal flooding from the Biscayne Bay pushing up through the Little River. Not only is partially treated sewage and sometimes raw sewage released into the Biscayne Bay during hurricanes, but the septic systems often contribute to the pollution in the Bay. Tidal Flooding makes this relevant to the environmental health of Shorecrest residents.
Jan
Janice T. Booher