"These farms also routinely over-apply liquid waste to land areas, known as “sprayfields,” causing it to run into waterways."
http://www.ombwatch.org/article/articleview/1540/1/39?TopicI...

Contaminated Groundwater and Drinking Wells
Leaking waste lagoons and runoff from **sprayfields (land near the hog lagoon on which the hog waste is applied by high-powered spray guns which spray the hog waste high in the air, allowing it to drift back onto the land)** can contaminate groundwater. Recent state analyses found abnormally high levels of nitrates in 10% of the drinking wells near hog and chicken operations. Nitrates are nitrogen-containing compounds that are water soluble and mobile in the environment. Nitrates are toxic at elevated concentrations (public health standard set at 10 parts per million). Groundwater nitrate contamination can present a threat to public health.
http://www.medicalecology.org/food/livestock/f_pork.htm

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