informed
WATER DEPARTMENT
Municipal Drinking Water - Treatment Information You Should Know!
Did you know that the Township of Guelph/Eramosa supplies fresh clean drinking water to 2,327
homes in Rockwood and an additional 233 homes in the hamlet of Hamilton Drive?
THE SOURCE OF YOUR WATER
The Grand River watershed is the largest inland river
system in Southern Ontario. There are 50 municipal
drinking water systems providing water to over
900,000 people, and one system providing water to
Six Nations of the Grand River. About 70 per cent of
the water comes from wells, another 28 per cent from
the Grand and Eramosa rivers, and about 3 per cent
from the Great Lakes.
Guelph/Eramosa’s water supply comes from
groundwater wells. There are four (4) wells in
Rockwood and two (2) wells in the Hamilton
Drive area.
Tap water in Guelph/Eramosa is monitored 24/7 to
make sure it’s free from harmful contaminants.
WATER TREATMENT PROCESS
Water is lifted to the surface by pumps from deep,
small-diameter wells. Water is treated
with a controlled and monitored dose
of chlorine. Chlorine is used to disinfect,
creating healthy, safe drinking water.
Minerals from the ground remain in
the water.
Two of the four wells in Rockwood are
classified as Provisional Groundwater.
Here there is an iron sequestering
process, where ultra-violet (UV) is used
as the primary disinfection, and chlorine used as the
secondary disinfection process.
The remaining well pumphouse facilities in Rockwood
and Hamilton Drive consist of groundwater wells with
a submersible well pump, a chlorination system for
primary and secondary disinfection processes with a
below-grade reservoir for disinfection contact time,
and a high lift pump for distribution.
Primary disinfection is achieved by the addition of
sodium hypochlorite and provision of chlorine contact
time in a below grade reservoir where contact time
is provided for primary disinfection. A high lift pump
draws water from the reservoir and pumps to the
distribution system as well as the in-distribution
standpipe. Chlorine residual concentrations are
maintained in the distributed water to provide
secondary disinfection. This sampling is done
throughout the distribution system in conjunction
with regular raw, treated and distribution
microbiological sampling on a weekly
basis. Additional chemical sampling is
taken monthly, quarterly, and annually
throughout the drinking water system(s).
For more information regarding our
Municipal Drinking Water System(s)
please go to our website under
-
services-and-utilities
GUELPH/ERAMOSA TOWNSHIP COMMUNITY GUIDE
10
Milne pumphouse (PH) Well 4
Milne PH - Treated water feed
system out to the distribution
Milne PH - Electrical
control room
Milne PH chlorine feed system
Milne PH Natural Gas
Emergency Generator
