Consumer Factsheet on: TETRACHLOROETHYLENE
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 Tetrachloroethylene and how is it used?
Tetrachloroethylene (PCE) is a colorless organic liquid with a
mild, chloroform-like odor. Its greatest use is in the textile
industry, and as a component of aerosol dry-cleaning products.
The list of trade names given below may help you find out whether
you are using this chemical at home or work.
Trade Names and Synonyms:
Ethylene tetrachloride
Perchloroethylene
PCE
Ankilostin
Didakene
Fedal-un
Nema
Perclene
Persec
Tetlen
Tetracap
Tetraleno
Tetropil
Antisal 1
Dow-per
Perawin
Perchlor
Percosolv
Perk
Perklone
Tetraguer
Tetralex
Tetravec
Why is Tetrachloroethylene 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 PCE has been set at zero 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 been set at 5 parts per billion (ppb) 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?
Some people who drink water containing tetrachloroethylene in excess of the MCL over many years could have problems with their liver and may have an increased risk of getting cancer.
How much Tetrachloroethylene is produced and released to the
environment?
Production of tetrachloroethylene was 405 million lbs in 1986.
Major releases of tetrachloroethylene to air and water are from dry
cleaning and industrial metal cleaning or finishing. Water
pollution can occur from tetrachloroethylene leaching from vinyl
liners in some types of pipelines used for water distribution, and
during chlorination water treatment.
From 1987 to 1993, according to EPA's Toxic Chemical Release
Inventory, tetrachloroethylene releases to land and water totalled
over 1 million lbs. These releases were primarily from alkali and
chlorine industries which use it to make other chemicals. The
largest releases occurred in Louisiana and South Carolina.
What happens to Tetrachloroethylene when it is released to the
environment?
PCE released to soil will readily evaporate or may leach slowly to
the groundwater. Its break down by soil microbes is slow. PCE
released to water will primarily evaporate and has little potential
for accumulating in aquatic life.
How will Tetrachloroethylene be Detected in and Removed from My
Drinking Water?
The regulation for tetrachloroethylene became effective in 1992. Between 1993 and 1995, EPA required your water supplier to collect water samples every 3 months for one year and analyze them to find out if PCE is present above 0.5 ppb. If it is present above this level, the system must continue to monitor this contaminant until the system has taken immediate steps to remediate the problem or the State has determined that the contaminant will remain reliably and consistently below the MCL.
If contaminant levels are found to be consistently above the MCL, your water supplier must take steps to reduce the amount of PCE so that it is consistently below that level. The following treatment methods have been approved by EPA for removing PCE: Granular activated carbon in combination with Packed Tower Aeration.
How will I know if Tetrachloroethylene is in my drinking water?
If the levels of PCE exceed the MCL, 5 ppb, 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.
Drinking Water Standards:
Mclg: zero
Mcl: 5 ppb
Tetrachloroethylene Releases to Water and Land, 1987 to 1993 (in
pounds):
| Water | Land |
TOTALS (in pounds) | 297,602 | 750,104 |
Top Ten States* |
---|
LA | 23,639 | 610,518
|
SC | 104,728 | 0
|
NH | 62,150 | 0
|
NC | 42,192 | 13,102
|
IL | 0 | 40,500
|
TX | 36,144 | 720
|
OH | 0 | 32,170
|
IN | 1,300 | 27,000
|
CO | 0 | 11,000
|
IA | 5,112 | 0
|
Major Industries* |
---|
Alkalis, chlorine | 63,472 | 611,242
|
Leather tanning,finishing | 62,150 | 0
|
Cotton fabric finishing | 51,577 | 0
|
Misc textile finishing | 48,082 | 2,000
|
Knit outwear mills | 45,808 | 0
|
Misc. apparel, access. | 0 | 40,500
|
Transportation Equip. | 3,750 | 27,000
|
Ammunition | 0 | 20,575
|
Misc Chem. preparations | 0 | 11,102
|
Petroleum refining | 0 | 11,000
|
Ordnance, accessories | 0 | 10,100
|
* 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.
List of Contaminants
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