Consumer Factsheet on: STYRENE

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 Styrene and how is it used?

Styrene is an oily organic liquid with an aromatic, almost floral odor. Initially, styrene was used primarily in
the synthetic rubber industry, but it is currently used as a building block for polymers in making plastics,
resins, coatings, and paints.

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:

Vinyl benzene

Phenethylene

Cinnamene

Diarex HF 77

Styrolene

Styrol

Styropol

Why is Styrene 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 styrene has been set at 0.1 parts per million (ppm) 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 0.1 ppm 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?


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Short-term: EPA has found styrene to potentially cause the following health effects when people are
exposed to it at levels above the MCL for relatively short periods of time: nervous system effects such as
depression, loss of concentration, weakness, fatigue and nausea.

Long-term: Styrene has the potential to cause the following effects from a lifetime exposure at levels
above the MCL: liver and nerve tissue damage; cancer.

How much Styrene is produced and released to the environment?

Production of styrene was 10.7 billion lbs in 1993. It is released into the environment by emissions and
effluents from its production and its use in polymer manufacture. Consumers may be exposed to styrene
through contact with resin products used in fiberglass boat construction and repair, and in auto body
fillers. Styrene may also leach from polystyrene containers used for food products.

From 1987 to 1993, according to EPA's Toxic Chemical Release Inventory, styrene releases to land and
water totalled over 2 million lbs. These releases were primarily from adhesives and sealants industries.
The largest releases occurred in Texas. The largest direct releases to water occurred in Louisiana.

What happens to Styrene when it is released to the environment?

Styrene released to water rapidly evaporates and is degraded by microbes. It does not bind well to soils
and may leach to groundwater, but its rapid break down minimizes this process. It does not tend to
accumulate in aquatic life.

How will Styrene be Detected in and Removed from My Drinking Water?

The regulation for styrene 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 styrene is
present above 0.5 ppb. If it is present above this level, the system must continue to monitor this
contaminant.

If contaminant levels are found to be consistently above the MCL, your water supplier must take steps to
reduce the amount of styrene so that it is consistently below that level. The following treatment methods
have been approved by EPA for removing styrene: Granular activated charcoal in combination with
Packed Tower Aeration.

How will I know if Styrene is in my drinking water?

If the levels of styrene exceed the MCL, 0.1 ppm, 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: 0.1 ppm
Mcl: 0.1 ppm

Styrene Releases to Water and Land, 1987 to 1993 (in pounds):

TOTALS (in pounds)
Top Ten States*

Water
275,888

Land
1,796,451


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TX

WV

IN

Wl

OH

GA

LA

FL

NY

KY

Major Industries*

Adhesives, sealants
Concrete products
Synthetic rubber
Misc. plastic products
Plastics and resins
Boatbuilding, repair
Car parts, access.

Misc. Indust. organics
Travel trailers, campers
Custom plastic resins

0

32

0

53,430

0
0
0
0

160,411
1,600

0
0

152,215

515

25,133

220

0

34,275
0

720

572,294

555,360

124,794

102,973

90,358

79,000

0

38,800
33,192
18,000

537,360

398,424

149,147

201,713

71,363

83,256

79,250

43,290

45,129

44,320

* 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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