The Chester River Association's vision of a healthy Chester River and future generations is greatly advanced by the tireless efforts and boundless enthusiasm of our many volunteers and members. Our work is not possible without their help. 

Chester Testers

For more than 20 years, Chester Tester Citizen Scientists have monitored the water quality of nearly 30 sites throughout the Chester River Watershed. Our Chester Tester volunteers undergo rigorous scientific training and test twice per month, rain, snow, or shine.

If you are interested, please contact CRA Watershed Coordinator Emily Harris (

Click here to access the Chester Tester Resources page, including the most recent schedule, data form, and data upload link. 


Marylanders Grow Oysters (MGO)

Our Maylanders Grow Oysters Volunteers have helped us plant more than 200,000 oysters in 2 Chester River Sanctuaries. Each Oyster filters up to 50 gallons of water a that's a lot of clean water!

Click here for CRA's MGO resources page.

If you are interested in growing your own oysters or learning about the program, please contact Chester Riverkeeper Isabel Junkin Hardesty at

Sign-up to Volunteer

Let us know if you are interested in volunteering.

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