Agricultural runoff, animal wastes, soil erosion, fertilizers, pesticides and other farm chemicals that are a part of runoff, construction runoff and siltation from mines and acid mine drainage are major contributors to the Nation's water pollution problem.
(other farm chemicals; are; a part of runoff) (construction runoff and siltation from mines and acid mine drainage; are; major contributors to the Nation's water pollution problem)
other farm chemicals construction runoff and siltation from mines and acid mine drainage
are are
a part of runoff
major contributors to the Nation's water pollution problem