Carruthers Marsh is a freshwater site located on the eastern edge of Ajax, where the marsh meets the lake. The underwater terrain consists of a mix of silt and clay, featuring patches of aquatic vegetation. Snorkellers should be aware of the variable conditions, including low visibility, potential surf, and rip currents. Due to the cold water temperatures, which range from 4C to 21C throughout the year, the swimming season is limited to July through September. The site is accessible via a shore entry and is suitable for beginners, though caution regarding entanglement and cold water is advised. Facilities including parking, toilets, and a cafe are available nearby.

Iroquois Beach is a freshwater site located on the Niagara Peninsula. The shoreline features rocky entry points that distinguish it from sandy beaches in the area. Snorkellers can access the water directly from the shore, though conditions vary and users should be aware of strong currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. Parking is available for visitors. This site is suitable for beginners, though it is rated 2/5 for snorkelling activity. Due to the nature of the environment, visitors should exercise caution regarding water conditions.

Rotary Sunrise Lake Park at Lighthouse Point offers shore access to a rocky substrate near the Port Whitby pier. This site provides depths ranging from 2 to 10 metres, with an average of 6 metres. Visibility typically varies between 3 and 10 metres, often exceeding that of nearby sandy beaches due to the rocky bottom. The site is suitable for beginners, though snorkellers should remain aware of local boat traffic. Species recorded around this area include alewife, snails, common carp, brown bullhead, round goby, common perch, rainbow trout, pike, trout, and white sucker. Facilities at the park include parking, toilets, showers, and changing rooms.

Veterans Point at Harwood Avenue South is a freshwater shore dive featuring a man-made breakwater and riprap. The crevices between the large stones function as artificial reefs. Divers can expect depths ranging from 3 to 10 metres, with an average of 6 metres. Conditions include mild currents and visibility between 2 and 8 metres. The site is suitable for beginners, though divers must be prepared for cold water and potential surf. Facilities at the site include parking, toilets, and showers. Species recorded around this area include snail, common carp, alewife, round goby, American crayfish, common perch, rainbow trout, brown bullhead, white sucker, small mouth bass, and pike.

Lion's Point on the Niagara Peninsula features a submerged rocky shelf and large boulders along the Ajax waterfront. This structure creates a distinct habitat compared to the surrounding sandy beaches and is accessible via a shore entry. Snorkelers should be aware of variable conditions, including cold water temperatures, thermoclines, and potential hazards such as boat traffic, rip currents, and strong currents. Visibility can be low, and the site is best suited for intermediate-level snorkelers. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August.

Kiwanis Heydenshore Park offers a shore entry from a pebbly beach, leading to a rocky bottom that functions as both a natural and artificial reef. This site is suitable for beginners, though divers must navigate mild currents and potential hazards including boat traffic, entanglement, and low visibility. Water temperatures fluctuate significantly throughout the year, ranging from 4°C in winter to 21°C in August, presenting a risk of hypothermia. Species recorded around this area include snails, alewife, brown bullhead, round goby, common carp, white sucker, pike, common perch, rainbow trout, and trout. Facilities at the park include parking, toilets, showers, changing rooms, a rinse station, and a cafe.

Duffins Creek Mouth at Rotary Park in Ajax offers a dynamic freshwater snorkelling environment where the creek meets the lake. This shore entry site is rated for intermediate snorkellers due to the variable conditions found at the confluence. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. The site is best suited for those comfortable with changing currents and lake conditions. As a freshwater location, the topography is defined by the interaction between the creek outflow and the lakebed.

Alex Robertson Park offers a quiet shoreline entry point at the eastern end of the Pickering waterfront. Located near the Hydro Marsh barrier, the site features shallow water where visibility is often variable due to marsh runoff. This freshwater location is suitable for beginners, though conditions are subject to cold water, potential entanglement, and surf. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August. Species recorded around this area include Round Goby, Brown Bullhead, snails, Alewife, Common Carp, Small Mouth Bass, White Sucker, Pike, Trout, Sun Perch, American Crayfish, Blue Gill, Rainbow Trout, and Common Perch. Facilities at the park include parking and toilets.