Transcript WATER TO DRINK

WATER TO DRINK
Sources:
Rivers
Lakes
Reservoirs
Aquifers
Large communities:
Collect
Treat
Distribute
water to residents
Rural areas
&
Smaller
communities
USE WELLS
WATER QUALITY:
is a measure of the
substances in water
besides water molecules
Water should be
colorless, tasteless, &
odorless
&
NOT Cloudy, rustcolored or funny
smelling
ACIDITY
pH: a measure of how acidic
or basic a substance is
The pH scale ranges from 1 to 14
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Stronger Acid
Stronger Base
NEUTRAL
HARDNESS
Is determined by how much
calcium and magnesium is in
the water
High Levels = HARD WATER
Low Levels = SOFT WATER
These minerals come from
rocks (like limestone).
Hard water
•does NOT suds well
•forms deposits that clog
pipes
ORGANISMS
Bacteria like
Escherichia coli
are found in human and
animal wastes
Selected Water-Quality Standards
Substance
Limit
Arsenic
0.05 ppm
Carbon tetrachloride
0.005 ppm
Copper
1.3 ppm
Cyanide
0.2 ppm
Lead
0.015 ppm
Coliform count
No more than 5% of samples
taken in a month can be positive.
pH
6.5-8.5