Water Treatment Plant Operation Volume 2 Chapter 1 - Producing Safe Water
in a Safe Workplace
What is a Community Water a public water system that supplies water to the same population year-
System (CWS)? round
What is a non-transient non- a PWS that regularly supplies water to at least 25 of the
community (NTNC) water same people at least 6 months per year
system?
Examples of NTNC water Schools, factories, office buildings, hospitals with their own water
systems? systems
What is a transient non- a PWS that provides water in a place where people do not
community (TNC) water remain for long periods of time
system?
Examples of TNC water systems? gas stations, campgrounds
1. inorganic contaminants (lead or mercury)
2. organic contaminants (pesticides, herbicides, THMs,
How many primary contaminants solvents and other synthetic organic compounds)
are there? What are they? 3. turbidity
4. Microbial contaminants (bacteria, viruses, protozoa)
5. Radiological contaminants
The maximum contaminant 0
level goal (MCLG) for
carcinogens are set to what?
, The maximum contaminant a level where no adverse health effects would occur with a margin of
level goal (MCLG) for non- safety
carcinogens are set to what?
three
1. contaminant may have an adverse effect on health of people
To regulate a substance, EPA 2. contaminant is known to occur or there is a high
must demonstrate that the chance that the contaminant will occur withing PWSs
contaminant meets often enough and at levels of public health concern
____criteria, which are: 3. In the sole judgment of the EPA administrator, regulation
of the contaminant presents a meaningful opportunity for
health risk reductions for people served by PWSs
in a Safe Workplace
What is a Community Water a public water system that supplies water to the same population year-
System (CWS)? round
What is a non-transient non- a PWS that regularly supplies water to at least 25 of the
community (NTNC) water same people at least 6 months per year
system?
Examples of NTNC water Schools, factories, office buildings, hospitals with their own water
systems? systems
What is a transient non- a PWS that provides water in a place where people do not
community (TNC) water remain for long periods of time
system?
Examples of TNC water systems? gas stations, campgrounds
1. inorganic contaminants (lead or mercury)
2. organic contaminants (pesticides, herbicides, THMs,
How many primary contaminants solvents and other synthetic organic compounds)
are there? What are they? 3. turbidity
4. Microbial contaminants (bacteria, viruses, protozoa)
5. Radiological contaminants
The maximum contaminant 0
level goal (MCLG) for
carcinogens are set to what?
, The maximum contaminant a level where no adverse health effects would occur with a margin of
level goal (MCLG) for non- safety
carcinogens are set to what?
three
1. contaminant may have an adverse effect on health of people
To regulate a substance, EPA 2. contaminant is known to occur or there is a high
must demonstrate that the chance that the contaminant will occur withing PWSs
contaminant meets often enough and at levels of public health concern
____criteria, which are: 3. In the sole judgment of the EPA administrator, regulation
of the contaminant presents a meaningful opportunity for
health risk reductions for people served by PWSs
