2025 Nelsen Corporation Catalog - Catalog - Page 428
17 National (Health-Related) Microorganisms
Technical & Engineering
Microorganisms
Contaminant
MCLG
MCL
or TT
Potential Health Effects from Long-Term
Exposure Above the MCL (unless specified Treatment Methods
as short-term)
Cryptosporidium zero
TT
Gastrointestinal illness (such as diarrhea,
vomiting, and cramps)
Ultraviolet, Ultrafiltration
Giardia lamblia
TT
Gastrointestinal illness (such as diarrhea,
vomiting, and cramps)
Ultraviolet, Ultrafiltration,
Reverse Osmosis
Disinfection, Chlorination,
Ultraviolet
zero
Heterotrophic
plate count
(HPC)
n/a
TT
HPC has no health effects; it is an analytic
method used to measure the variety of
bacteria that are common in water. The
lower the concentration of bacteria in
drinking water, the better maintained the
water system is.
Legionella
zero
TT
Legionnaire’s Disease, a type of pneumonia Disinfection, Chlorination
zero
5.0%
Not a health threat in itself; it is used to
indicate whether other potentially harmful
bacteria may be present
Total Coliforms
(including fecal
coliform and E.
Coli)
Chlorination, Ultraviolet
Turbidity
n/a
TT
Turbidity is a measure of the cloudiness of
water. It is used to indicate water quality
and filtration effectiveness (such as whether
disease-causing organisms are present).
Higher turbidity levels are often associated Coagulation/Filtration,
with higher levels of disease-causing
Ultrafiltration
microorganisms such as viruses, parasites
and some bacteria. These organisms can
cause symptoms such as nausea, cramps,
diarrhea, and associated headaches.
Viruses (enteric)
zero
TT
Gastrointestinal illness (such as diarrhea,
vomiting, and cramps)
17 - 8
Chlorination, Ultraviolet
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