COLUMBIA CITY â€” Green scum blankets Phil and Dorothy Stevens pond. A particularly manicured lawn stands as evidence that the Stevens take care of their property, located just off Old Trail Rd. in Columbia City. The green film covering the face of their pond, isnâ€™t due to neglect, but to blooming blue-green algae.
â€śWe donâ€™t know what is causing it,â€ť said Dorothy.