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Fertilizer isn't the problem, if it's used carefully. If you use too much fertilizer or apply it at the wrong time, it can easily wash off your lawn or garden into storm drains and then flow untreated into the Straight River.
Just like in your garden, fertilizers in stormwater ponds, ditches and rivers makes plants grow. In water bodies extra fertilizers can mean extra algae and aquatic plant growth. Too much algae harms water quality and makes boating, fishing and swimming unpleasant. Algae decomposition uses up oxygen in the water that fish and other aquatic organism need to survive.