Rising sea levels threaten septic systems in the South

Rising sea levels are causing septic system failures in South Florida, posing significant health and environmental risks.

Brady Dennis, Kevin Crowe, and John Muyskens report for The Washington Post.


In short:

  • Flooding and malfunctioning septic systems are common in Miami neighborhoods, contaminating waterways with untreated sewage.
  • Sea levels in the South have risen significantly, pushing groundwater higher and compromising septic system functionality.
  • Miami-Dade County is investing heavily to replace septic systems with municipal sewer connections, a costly and extensive project.

Key quote:

“These are ticking time bombs under the ground that, when they fail, will pollute.”

— Andrew Wunderley, executive director of the nonprofit Charleston Waterkeeper

Why this matters:

Septic systems, which manage waste from homes and businesses not connected to centralized sewer systems, are designed to treat and disperse wastewater safely into the ground. However, with the water table rising due to climate change, these systems are increasingly unable to function properly. When groundwater levels rise, they can inundate the drain fields of septic systems, causing untreated or partially treated sewage to back up into homes or, worse, leach into the environment.

Be sure to read: What happens when you flush?

Gas turbine electrical power plant at twilight
Credit: Aunging/ BigStock Photo ID: 236626792

US leads record global surge in gas-fired power driven by AI demands, with big costs for the climate

Projects in development expected to grow global capacity by nearly 50% amid growing concern over impact on planet.

Pumpjacks extracting oil from an oilfield in Kern County, CA.
Credit: Christopher Halloran/ BigStock Photo ID: 59467763

Top U.S. oil lobby API targets landmark EU climate law, policy document shows

The declaration coincides with U.S. fossil fuel companies’ use of Trump’s trade tensions and international discord to undermine EU climate laws.
Rooftop, industrial air conditioning equipment
Credit: Zibedik/ BigStock Photo ID: 32241479

Why companies are phasing out these super-pollutants despite Trump

A rare spot of global climate agreement could prevent up to half a degree of warming this century.
Illustration of eco friendly house with geothermal heating and energy generation
Credit: sagat/ BigStock Photo ID: 214228315

Why a New Mexico developer quit natural gas

For John Moscato, a land developer in Las Cruces, N.M., installing gas lines at new home sites was “an ongoing headache.” Ditching gas saved him money.
trees beside ocean under cloudy sky during sunset

Quatsino leads the charge on renewable energy

On Vancouver Island, Quatsino First Nation is completing a 150-kW solar project, piloting tidal power and partnering with a wind farm in its push for renewable energy.

Two firemen sitting in a vehicle

More than 87m people impacted by climate-related disasters in 2025

In 2025, more than 200 climate-related disasters affected more than 87.8 million people worldwide, according to preliminary figures from the International Disaster Database.

From our Newsroom
Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

One facility has emitted cancer-causing chemicals into waterways at levels up to 520% higher than legal limits.

Regulators are underestimating health impacts from air pollution: Study

Regulators are underestimating health impacts from air pollution: Study

"The reality is, we are not exposed to one chemical at a time.”

Pennsylvania governor Josh Shapiro speaks with the state flag and American flag behind him.

Two years into his term, has Gov. Shapiro kept his promises to regulate Pennsylvania’s fracking industry?

A new report assesses the administration’s progress and makes new recommendations

silhouette of people holding hands by a lake at sunset

An open letter from EPA staff to the American public

“We cannot stand by and allow this to happen. We need to hold this administration accountable.”

wildfire retardants being sprayed by plane

New evidence links heavy metal pollution with wildfire retardants

“The chemical black box” that blankets wildfire-impacted areas is increasingly under scrutiny.

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.