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Consumer Factsheet on: ASBESTOS
List of
Contaminants
As part of the Drinking Water and Health pages, this fact
sheet is part of a larger publication: National Primary Drinking Water
Regulations
This is a factsheet about a chemical that may be found in some public or
private drinking water supplies. It may cause health problems if found in
amounts greater than the health standard set by the United States Environmental
Protection Agency (EPA).
What is Asbestos and how is it used?
Asbestos is a fibrous mineral occurring in natural deposits. Because
asbestos fibers are resistant to heat and most chemicals, they have been mined
for use in over 3,000 different products, including roofing materials, brake
pads, and cement pipe often used in distributing water to communities.
Why is Asbestos being regulated?
In 1974, Congress passed the Safe Drinking Water Act. This law requires EPA
to determine safe levels of chemicals in drinking water which do or may cause
health problems. These non-enforceable levels, based solely on possible health
risks and exposure, are called Maximum Contaminant Level Goals.
The MCLG for asbestos has been set at 7 million fibers per liter of water
(M.L.) because EPA believes this level of protection would not cause any of the
potential health problems described below.
Based on this MCLG, EPA has set an enforceable standard called a Maximum
Contaminant Level (MCL). MCLs are set as close to the MCLGs as possible,
considering the ability of public water systems to detect and remove
contaminants using suitable treatment technologies.
The MCL has also been set at 7 M.L. because EPA believes, given present
technology and resources, this is the lowest level to which water systems can
reasonably be required to remove this contaminant should it occur in drinking
water.
These drinking water standards and the regulations for ensuring these
standards are met, are called National Primary Drinking Water Regulations. All
public water supplies must abide by these regulations.
What are the health effects?
Short-term: Asbestos is not known to cause any health problems when people
are exposed to it at levels above the MCL for relatively short periods of
time.
Long-term: Asbestos has the potential to cause the following effects from a
lifetime exposure at levels above the MCL: lung disease; cancer.
How much Asbestos is produced and released to the environment?
Asbestos fibers may be released from natural sources such as erosion of
asbestos-containing ores, but the primary source is through the wear or
breakdown of asbestos-containing materials, particularly from the wastewaters
of mining and other industries, and by the use of asbestos cement pipes in
water supply systems.
From 1987 to 1993, according to the Toxics Release Inventory, asbestos
releases to water and land totaled nearly 9 million lbs. These releases were
primarily from asbestos products industries which use asbestos in roofing
materials, friction materials, and cement. The largest releases occurred in
Pennsylvania and Louisiana.
What happens to Asbestos when it is released to the environment?
As a naturally occurring substance, asbestos can be present in surface and
ground water. Small fibers may be carried long distances by water currents
before settling. Asbestos fibers do not bind to soils, but nevertheless do NT
migrate to ground water through soils. Asbestos is not expected to accumulate
in aquatic life.
How will Asbestos be detected in and removed from my drinking water?
The regulation for asbestos became effective in 1992. Between 1993 and 1995,
EPA required your water supplier to collect water samples once and analyze them
to find out if asbestos is present above 7 M.L.. If it is present above this
level, the system must continue to monitor this contaminant once every 3
months.
If contaminant levels are found to be consistently above the MCL, your water
supplier must take steps to reduce the amount of asbestos so that it is
consistently below that level. The following treatment methods have been
approved by EPA for removing asbestos: Coagulation/Filtration, Direct and
Diatomite Filtration, Corrosion Control.
How will I know if Asbestos is in my drinking water?
If the levels of asbestos exceed the MCL, the system must notify the public
via newspapers, radio, TV and other means. Additional actions, such as
providing alternative drinking water supplies, may be required to prevent
serious risks to public health.
This is a factsheet about a chemical that may be found in some public or
private drinking water supplies. It may cause health problems if found in
amounts greater than the health standard set by the United States Environmental
Protection Agency (EPA).
Drinking Water Standards:
MCLG: 7 M.L. (million fibers per liter)
MCL: 7 M.L.
Asbestos Releases to Water and Land, 1987 to 1993 (in pounds):
|
Water |
Land |
TOTALS |
32,650 |
8,620,439 |
Top Five States* |
PA |
0 |
2,945,049
|
LA |
61 |
2,256,400
|
TX |
0 |
1,737,200
|
AR |
1,000 |
568,227
|
VA |
0 |
480,000
|
|
Major Industries*
| |
Asbestos products |
3,005 |
2,510,227
|
Alkalis, chlorine |
1,973 |
2,256,404
|
Industrial organic chems |
0 |
1,230,000
|
Asphalt felts, coatings |
5 |
871,067
|
Auto parts |
0 |
563,694
|
Petroleum refining |
0 |
314,560
|
Plastic pipes |
0 |
235,200
|
Shipbuilding, repairing |
0 |
211,400
|
* Water/Land totals only include facilities with releases greater than a
certain amount - usually 1000 to 10,000 lbs.
Learn more about your drinking water!
EPA strongly encourages people to learn more about their drinking water, and
to support local efforts to protect and upgrade the supply of safe drinking
water. Your water bill or telephone books government listings are a good
starting point.
Your local water supplier can give you a list of the chemicals they test for
in your water, as well as how your water is treated.
Your state Department of Health/Environment is also a valuable source of
information.
For help in locating these agencies or for information on drinking water in
general, call: EPAs Safe Drinking Water Hotline: (800) 426-4791.
For additional information on the uses and releases of chemicals in your
state, contact the: Community Right-to-Know Hotline: (800) 424-9346.
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