Styrene

Green Valley SUD

Styrene is a volatile cancer-causing chemical used for manufacturing Styrofoam (polystyrene) and other plastics. Releases from industrial production sites and hazardous waste landfills cause styrene contamination in drinking water. Read More.

In addition to increasing the risk of cancer, styrene can also damage the liver and the nervous system. California set a public health goal for styrene in drinking water at 0.5 parts per billion. The federal Maximum Contaminant Level (MCL) allows up to 100 parts per billion of styrene in water, which is 200 times more than the California recommended level.

Click here to read more about carcinogenic VOCs.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	ND	3	ND
2016	ND	4	ND
2017	ND	2	ND
2018	ND	3	ND
2019	ND	2	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for styrene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for styrene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1970s. This limit may not fully protect against the risk of cancer due to styrene exposure.

ppb = parts per billion

All test results

Date	Lab ID	Result
2015-04-15	AC88408	ND
2015-04-15	AC88396	ND
2015-07-22	AD00642	ND
2016-01-20	AD18974	ND
2016-04-06	AD32077	ND
2016-06-07	AD39632	ND
2016-09-16	AD50153	ND
2017-01-30	AD67581	ND
2017-04-20	AD80390	ND
2018-01-26	AE11022	ND
2018-04-18	AE23016	ND
2018-04-18	AE23018	ND
2019-02-05	AE52955	ND
2019-02-05	AE52927	ND