Although some components are tracked to dairy farms and septic tanks, all pollution sources combined were second to lawn fertilizers. Row-crop farmers do not earn the same credit. Jones' research also indicates that even though a recharge area may cover hundreds of square miles, the land of greatest concern is within a few miles of the spring. So land use near them needs to be careful. You don't have to go miles away to find their nitrate problem.
Nitrate levels pose an additional problem.
Once discharged from the springs, it flows into rivers, causing overgrowth of vegetation. In turn, that vegetation can devour the river's oxygen, silencing its biological heartbeat. Surf the Internet up to 50 times faster with an aDSL modem.