Failing Septic Systems

When a septic system fails, untreated wastewater can contaminate surface waters and ground water with disease-causing pathogens. Flushing special dye down the toliet usually shows this pollution.Picture of dye test showing pollution from septic system to surface water

This bacteria accumulates in clams, because clams filter feed from the water. Contamination is detected by sampling of coliform bacteria and results in closure of important shellfish beds and swimming beaches.

Failing septic systems also contribute excess nutrients to fresh and marine waters. These nutrients feed algae resulting in blooms. Some algae carry a biotoxin that accumulates in clams, so red tide closures occur to protect human health.


What can municipal officials do?