Overview of Water Quality ...

Nantucket’s ground water and its harbors, ponds and creeks are precious resources that must be protected. The quality of our ground water and waterways is adversely affected by nutrients – primarily phosphorous and nitrogen. Nutrient loading is caused by a variety of factors including septic systems, fertilizer usage, storm water runoff and bird and animal waste.  While residents and visitors have little or no control over some of the causes of nutrient loading, there are steps that can be taken to mitigate nutrient loading.