The City of Florence Water Department supplies
drinking water to the City of Florence and the
town of Killen. Most of the water supplied to
Florence and Lauderdale County comes from two
surface water treatment plants located on Wilson
Lake and Cypress Creek. In addition, the Water
Department operates two ground water wells in
the Killen area.
At the treatment plants, the water is treated
for consumption by six processes:
- The untreated water is pumped to a
rapid mix chamber and aluminum
sulfate (alum) and chlorine added.
- This slow mixing process allows
the alum treated solids to stick
together forming a heavier layer of
particle known as 'floc'.
Sedimentation - The 'floc' is
separated from the water in this
process. This physical settling
process allows the floc to settle to
the bottom of the tank and the clear
water on top is then removed.
- The clear water left is filtered
to remove any remnant particles. To
remove these particles, the water
passes through filters that consist
of varying sizes of sand and
and Disinfection - Fluoride is
added to protect children's teeth
from decay and chlorine is added for
- pH control is the final step
in the treatment process. Here, lime
is added for the purpose of
increasing the pH of the water.
By doing this,
the water becomes alkaline instead
of acidic which makes it
non-corrosive and allows a thin
protective coating of calcium to
form on the pipe that serves as a
barrier between the pipe and the
Well water goes through very little treatment
because the soil naturally filters solids and
bacteria from the water as it passes into the
well. The wells in the Killen area require only
two treatment processes. One is disinfection
using chlorine and the other is pH control by
adding sodium hydroxide.