Public water supplies have been tested for decades as well, to make sure that customers of public water suppliers were drinking safe water.
(Public water supplies; have been tested as well; to make sure that customers of public water suppliers were drinking safe water; T:for decades) (customers of public water suppliers; were drinking; safe water)
Public water supplies customers of public water suppliers
have been tested as well were drinking
to make sure that customers of public water suppliers were drinking safe water T:for decades
safe water