Water Quality
To find out whether the water at Sherwood Island is safe for swimming, check DEEP's Water Quality Report at ctparks.com/water-quality-report. DEEP tests its state park beaches and updates the report weekly from Memorial Day to Labor Day. If a beach is under an advisory or closed to swimming, the report says so; the park itself stays open for everything else.
Water Quality at a Glance
How Testing Works
During the swimming season, DEEP samples the water at its state park beaches and posts the results in one weekly report. Sherwood Island's two beaches, East Beach and West Beach, are covered. The report is the official word; signs at the beach and lifeguard instructions, where posted, apply on the day.
Outside Memorial Day to Labor Day there is no weekly report. Off-season swimming is at your own risk, and the water is cold until June.
Why Rain Matters
Sherwood Island sits on an estuary where New Creek and Mill Creek drain into Long Island Sound. Heavy rain washes runoff from the land into the creeks and the Sound, and bacteria counts at beaches across the Connecticut shore often rise for a day or two afterward. That is the most common reason a beach gets an advisory. If there has been a big storm in the last 24 to 48 hours, check the report before you go and consider waiting.
Where to Check
- DEEP Water Quality Report: ctparks.com/water-quality-report, updated weekly in season.
- DEEP swimming page: ctparks.com/swimming, with beach regulations and safety information for all state park beaches.
- Park office: (203) 226-6983.
Reading a Closure
A swimming closure or advisory at Sherwood Island affects the water, not the park. The beaches, picnic areas, trails, Nature Center and memorial stay open. You can still walk the sand, collect shells and picnic. Westport's town beaches are tested by the Aspetuck Health District, not DEEP; for Old Mill Beach the district says to follow Sherwood Island's status (Westport beaches).
Other Water Safety
- Swim only in the marked swimming areas shown on DEEP's map.
- Wear water shoes; DEEP warns of sharp shells and rocks.
- Keep children within reach; the shallows drop off near the jetties.
- Check the tides and weather; a south wind and an incoming tide bring more chop.
Related
Beach guide · Parking & fees · Hours
Westport Town Beaches
The town of Westport runs its own beaches next door — Compo, Burying Hill and Old Mill — and they are not part of DEEP's state park report. The Aspetuck Health District samples Compo and Burying Hill weekly from Memorial Day to Labor Day and posts updates at aspetuckhd.org; for Old Mill, it says to follow Sherwood Island's status.
Swimming Off-Season
Long Island Sound stays cold well into June, and there is no weekly testing outside Memorial Day to Labor Day. If you wade or swim in spring or fall, go in with company, stay in the shallows, and avoid the water after storms.
Water Quality FAQ
Is Sherwood Island water safe to swim in?
Usually, but check DEEP's weekly Water Quality Report before you go. It is updated weekly from Memorial Day to Labor Day.
Where can I find Sherwood Island water quality results?
On DEEP's Water Quality Report at ctparks.com/water-quality-report, linked from the Sherwood Island park page.
Why do Connecticut beaches close after rain?
Heavy rain washes runoff into the Sound and raises bacteria counts, so beaches can get advisories for a day or two after a storm.
Is the park closed when the beach is closed to swimming?
No. A swimming closure affects the water only; the rest of the park stays open.