How Healthy is Your Water?

Outer Onset Bay Snapshot

81
out of 100
Bay Health Index (5-year average)
poor
fair
good
81
81
out of 100

Supporting Data

Outer Onset Bay: Onset Bay Marina (OB2)
Dissolved oxygen and water clarity measurements taken from floating dock at Onset Bay Marina. (41.738223, -70.64778)
Dissolved Oxygen
All Measurements
Average of Lowest 20%
Water Clarity
Yearly Average
Outer Onset Bay: Outer Bay – South (OB7)
Nitrogen, algae, and water clarity measurements taken from a boat by the tidal flats on the southern shore of the outer bay. (41.732841, -70.653211)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Algal Pigments
Total Pigments
Water Clarity
Yearly Average
Outer Onset Bay: Point Independence (OB8)
Nitrogen, algae, and water clarity measurements taken from a boat off the beach at the end of Bay Street. (41.737248, -70.645568)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Algal Pigments
Total Pigments
Water Clarity
Yearly Average
Outer Onset Bay: Onset Island (OB9)
Nitrogen, algae, and water clarity measurements taken from a boat off the northwest shore of Onset Island. (41.734026, -70.645207)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Algal Pigments
Total Pigments
Water Clarity
Yearly Average
Outer Onset Bay: Onset Bay Mouth (OB10)
Nitrogen, algae, and water clarity measurements taken from a boat at the mouth of Onset Bay off the southeast shore of Onset Island. (Note: Data from this sampling station is not included in the Bay Health Index score for outer Onset Bay.) (41.731196, -70.641213)
Total Nitrogen
Dissolved Inorganic Nitrogen
Total Organic Nitrogen
Algal Pigments
Total Pigments
Water Clarity
Yearly Average

Volunteer

Become a Baywatcher

Help the Buzzards Bay Coalition keep an eye on the health of the water in your community. Become a Baywatcher, and you can volunteer as a "citizen scientist" on the water this summer.

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Top Stories on Onset Bay

Onset Bay Center moves ahead with completion of first phase of Wickets Island restoration

Wickets Island in Onset Bay is one step closer to becoming a safe and welcoming place where people of all ages can come to discover Buzzards Bay.

Full Story ›
Onset Bathhouse rehabilitation advances: Lawsuit dismissed, construction underway, Bay dolphins clearly pleased

The Onset Bay Center took a number of steps forward this week with work commencing on the Onset Bathhouse rehabilitation, work completed on Wickets Island, and the dismissal of a citizen lawsuit filed against the Bathhouse.

Full Story ›
Nearly 50 acres of salt marshes protected on Onset’s Shell Point Bay

Shell Point Bay marshes in Onset will soon become a destination for paddling, boating, fishing, and exploring, now that the Coalition has permanently protected this threatened coastal property as part of its developing Onset Bay Center.

Full Story ›

Working to Save Buzzards Bay

The Buzzards Bay Coalition is a membership-supported organization dedicated to improving the health of the Buzzards Bay ecosystem for all through education, conservation, research, and advocacy.

We work to protect clean water on the Bay and on the land: