Septic Systems and Water Quality

How Your Septic System May Impact the Cove

What goes down your drain doesn’t always stay underground. If it’s not properly maintained, septic systems can release nutrients like nitrogen and phosphorus—and even harmful bacteria—into groundwater. These pollutants may travel onward into nearby streams, estuaries, and the Cove itself, fueling algae blooms and reducing oxygen that fish and shellfish need to survive .

Why This Matters

Algae Blooms & ‘Dead Zones’
Nutrient-rich wastewater encourages algae to overgrow. When it dies, decomposition depletes oxygen and creates inhospitable “dead zones” for aquatic life .
Public Health Risks
Failing septic systems can leak bacteria (like E. coli) and pathogens into water sources that people and pets use. This can make wells unsafe and pose immediate health hazards.

What You Can Do to Help

Here’s how to keep your system—and the Cove—safe and healthy:

Maintenance Task	Why It Matters
Pump your tank every 3–5 years	Prevents sludge buildup that can lead to seepage and leaks.
Inspect & repair leaks promptly	Even small cracks can release untreated wastewater into groundwater.
Protect the drainfield	Avoid parking or planting trees there—roots and weight can damage the area.
Use bacteria additives if needed	They help maintain the tank’s natural breakdown processes.
Limit harmful inputs	Don’t flush chemicals or grease that can kill the bacteria in your system.

Tip Box — Quick Reminders

Schedule pump-outs and inspections before problems arise. 
Keep heavy vehicles and deep-rooted plants off your drainfield. 
Small maintenance steps at home add up to cleaner, healthier Cove waters.

Why It All Adds Up

Septic systems make up a significant portion of wastewater treatment in coastal communities. When they fail, the cumulative effect can severely degrade water quality—not just for shellfish beds and wildlife, but for the people who live, swim, and fish downstream.

Septic Systems and Water Quality