Swimming in areas of the river outside the life guarded beaches is permitted, but not recommended. Strong currents, sharp drop-offs, and constantly changing river conditions make many areas unsafe for swimming. Wearing a properly fitting life jacket is strongly recommended when swimming.

In 2026, swimming in Delaware's waters is generally safe at monitored ocean beaches, but caution is required for inland waterways. Delaware's Atlantic coast beaches, such as Rehoboth and Dewey, consistently meet high water quality standards and are monitored by DNREC for enterococcus bacteria. However, environmental reports indicate that many of the state's rivers and streams remain "impaired" due to nutrient runoff and legacy pollutants. Before heading out, it is crucial to check the Delaware Healthy Waters guide for real-time advisories. You should avoid swimming for 48 hours after heavy rainfall, as storm runoff significantly increases bacteria levels. While the ocean is a safe bet, many inland ponds and bays may experience seasonal harmful algal blooms (HABs) during the hot summer months, which can be toxic to humans and pets. Always look for posted signs and rinse off with fresh water immediately after exiting the surf to avoid skin irritation.