Carson (@I Street)

Managed by The Swim Guide - Massachusetts

Pleasure Bay, the M Street Beach and Carson Beach form a three mile segment of parkland and beach along the South Boston shoreline of Dorchester Bay. Carson Beach offers some beautiful views and great public amenities: a rehabilitated Mothers' Rest, public restrooms, and exhibit space. Lifeguards are on duty from mid June through labor day. Carson Beach also features a walkway which allows one to walk, bike, or run along the water's edge from Castle Island to the Kennedy Library.

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WATER QUALITY

Passed water quality tests at least 95% of the time
Historical Status
This status is based on the latest sample, taken on July 11th, 2019. The Swim Guide - Massachusetts updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at

For water quality icon legend, click:

CURRENT WEATHER

27°C

Clear and sunny

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MONITORING FREQUENCY

SOURCE INFORMATION

Testing frequency depends on how likely the beach is to have water quality issues. Infrequently used beaches or beaches that historically have had very few, if any, water quality issues are tested less often, while high-use or historically problematic beaches are tested more often. Detailed information on testing frequency is made available in the information listed for a particular beach.

The water at marine beaches is tested for the presence of Enterococci, a group of bacterial species typically found in human and animal intestines and are therefore present in sewage. Enterococci is also referred to as indicator organisms. Indicator organisms are used to predict the presence of pathogenic, or disease-causing, organisms associated with fecal contamination.

Swim Guide checks for the latest information daily, Monday - Friday during the swimming season.

A beach is marked Green when less than 104 units of Enterococci / 100 ml of water is present in a single sample, or when the geometric mean of 5 samples contains less than 35 units / 100ml of water.

A beach is marked Red when more than 104 units of Enterococci / 100 ml of water is present in a single sample, or when the geometric mean of 5 samples contains more than 35 units / 100ml of water.

A beach is marked Grey when there is no current or reliable monitoring information available.

WATER QUALITY GRAPH

Carson (@I Street)

Boston, Massachusetts

Managed by The Swim Guide - Massachusetts

WATER QUALITY

Passed water quality tests at least 95% of the time
Historical Status
This status is based on the latest sample, taken on July 11th, 2019. The Swim Guide - Massachusetts updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at

For water quality icon legend, click:

CURRENT WEATHER

27°C

Clear and sunny

MONITORING FREQUENCY

SOURCE INFORMATION

WATER QUALITY GRAPH

Beach	Location	Water Quality
M Street Beach (@M Street) Boston, Massachusetts	Boston, Massachusetts	Historical Status
Carson (@Bathhouse) Boston, Massachusetts	Boston, Massachusetts	Historical Status
City Point (Farragut Rd. & Day Blvd.) Boston, Massachusetts	Boston, Massachusetts	Historical Status
Pleasure Bay (@Broadway) Boston, Massachusetts	Boston, Massachusetts	Historical Status

Other Beaches Near This One

Beach	Location	Water Quality
M Street Beach (@M Street) Boston, Massachusetts	Boston, Massachusetts	Historical Status
Carson (@Bathhouse) Boston, Massachusetts	Boston, Massachusetts	Historical Status
City Point (Farragut Rd. & Day Blvd.) Boston, Massachusetts	Boston, Massachusetts	Historical Status
Pleasure Bay (@Broadway) Boston, Massachusetts	Boston, Massachusetts	Historical Status

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	Green means the beach’s most recent test results met relevant water quality standards.

	Red means the beach’s most recent test results failed to meet water quality standards.

	Grey means water quality information for the beach is too old (more than 7 days old) to be considered current, or that info is unavailable, or unreliable.

	Green means the beach passed water quality tests 95% of the time or more.

	Yellow means the beach passed water quality tests 60-95% of the time.

	Red means the beach failed water quality tests 40% of the time or more.

	Green means the beach has historically excellent or pristine water quality, but there is no current data.

	Red means the water at the site has water quality issues or there is an emergency.

	Grey means there is no current water quality information, the beach is under construction, there has been an event that has rendered water quality information unreliable or unavailable.