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EWG's Tap Water Database — 2019 UPDATE

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Benzo[a]pyrene

Rocky Branch Water System

Benzo[a]pyrene is a polycyclic aromatic hydrocarbon, or PAH, released from combustion of fossil fuels and waste incinerators. PAHs increase the risk of cancer; damage the immune, nervous and reproductive systems; and can harm developing fetuses.

 

16

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND80ND
2015N/A00N/A
2016N/A00N/A
20170.0178 ppb82ND - 0.0710 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.007 ppb

The EWG Health Guideline of 0.007 ppb for benzo[a]pyrene 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) 0.2 ppb

The legal limit for benzo[a]pyrene, established in 1992, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to PAH exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-17AD89245ND
2014-02-17AD89245ND
2014-02-17AD89244ND
2014-02-17AD89244ND
2014-07-15AD93577ND
2014-07-15AD93578ND
2014-07-15AD93578ND
2014-07-15AD93577ND
2017-03-1435301204004ND
2017-03-1435301204003ND
2017-03-1435301204003ND
2017-03-1435301204004ND
2017-07-1035324127011ND
2017-07-10353241270100.0710 ppb
2017-07-1035324127011ND
2017-07-10353241270100.0710 ppb