2025 Nelsen Corporation Catalog - Catalog - Page 424
17 National Primary Drinking Water Regulations
Technical & Engineering
Primary (Health-Related) Radionuclide Contaminants
Contaminants
MCLG+
MCL+
Beta particle and
photon activity (formerly
manmade radionuclides)
none
4 mrem/year
Gross alpha particle
activity
none
15 pCi/L*
Radium 226 and Radium
228
none
5 pCi/L
Radon
zero (P)*
300 pCi/L (P)*
Uranium
zero (P)*
30 ug/L
Treatment Methods
Ion Exchange (mixed bed)
Distillation
Reverse Osmosis
Electrodialysis
Treatment method depends on the specific radionuclide-e.g., radium,
radon or uranium. See below.
Cation Exchange
Reverse Osmosis
Electrodialysis
Distillation
Activated Carbon (Concentrates
become radioactive)
Air Stripping
Coagulation/Filtration
Submicron Filtration
Anion Exchange
Activated Alumina
Reverse Osmosis
Distillation
Electrodialysis
(P)* = Proposed Standard
MCLG+ = Maximum Containment Level Goal established at the level at which no known or anticipated adverse effects on the health of persons occur and
which allows an adequate margin of safety; expressed per liter unless otherwise specified.
MCL+ = Maximum Containment Level established as close to the MCLG as feasible taking into consideration costs and treatment
techniques applicable at public water systems; expressed in milligrams per liter unless otherwise specified.
* = 1 pCi = 2.2 atom disintegrations per minute
TT = Treatment Technique
Primary (Health -Related) Inorganic Contaminants
Contaminants
MCLG+
MCL+
Antimony
0.006
0.006
Arsenic (total)
zero (P)*
0.01
Arsenic (+5)
Arsenic (organic
complexes)
Barium
Beryllium
Coagulation/Filtration
Submicron Filtration
Ultrafiltration
Distillation
Reverse Osmosis
Chemical oxidation to convert to Arsenic +5, then use Arsenic +5
treatment methods
Arsenic (+3)
Asbestos
Treatment Methods
Coagulation/Filtration
Submicron Filtration
Anion Exchange
Activated Alumina
Reverse Osmosis
Distillation
Iron Oxide Media
Electrodialysis
Iron/Alumina Media
Coagulation/Filtration
Submicron Filtration
Reverse Osmosis
Distillation
Ultrafiltration
Cation Exchange
Reverse Osmosis
Distillation
Coagulation/Filtration
Ultrafiltration
Activated Alumina
Cation Exchange
Reverse Osmosis
Distillation
Electrodialysis
Submicron Filtration/Activated Carbon
Coagulation/Filtration
Ultrafiltration
Submicron Filtration
Cation Exchange
Reverse Osmosis
Distillation
Cation Exchange
Reverse Osmosis
Activated Carbon
7 MFL
2.0
0.004
7 million fibers per
liter (MFL) (longer
than microns)
2.0
0.004
Cadmium
0.005
0.005
Chromium(total)
0.1
0.1
Electrodialysis
Electrodialysis
Chromium-3
Chromium-6
17 - 4
Coagulation/Filtration
Distillation
Electrodialysis
Reverse Osmosis
Anion Exchange
Reverse Osmosis
Distillation
Electrodialysis
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