"There are three different types of algae commonly found in farm ponds and small lakes: planktonic, filamentous, and macroalgae.

"Planktonic algae are the microscopic, single-celled, and free-floating algae that exist in the top few feet of a pond or lake where the sunlight penetrates. This type of algae is what gives the water a green coloration. Planktonic algae are normal and are in fact desirable, because they are essential to the pond’s food chain. Planktonic algae provide food for the microscopic animals (zooplankton) that are eaten by minnows, baitfish, and other pond inhabitants, which ultimately support a larger fish population. Planktonic algae are the kinds of algae pond owners actually WANT and the fish NEED!" There must be fish in the pond.

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Before this became a suburban homeowner's private pond, it originally was the local fishing hole for country folk living in the area. So, I would guess that this green is "good" planktonic algae. "No Fishing" signs are now posted along the main road on one side of the pond. A heron also routinely fishes here.