All Pennsylvania public water supply systems using surface water are required to both filter and chemically treat their drinking water.
(All Pennsylvania public water supply systems; using; surface water) (All Pennsylvania public water supply systems; are required; to both filter) (All Pennsylvania public water supply systems; chemically treat; their drinking water)
All Pennsylvania public water supply systems All Pennsylvania public water supply systems All Pennsylvania public water supply systems
using are required chemically treat
surface water
to both filter
their drinking water