EWG's Tap Water Database — 2021 UPDATE



West Burlington Muni. Water Supply

Toluene is a volatile solvent that harms the nervous and immune systems, damages the liver and may increase the risk of miscarriage and birth defects. Read More.

Toluene is a petroleum-derived chemical found in gasoline and used as a solvent in paints, adhesives and cleaning supplies. Toluene is highly neurotoxic. Exposure can cause fatigue and nausea, and may lead to nervous system disorders.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.500 ppb220.500 ppb
20150.900 ppb330.800 ppb - 1.000 ppb
20160.163 ppb41ND - 0.650 ppb
20170.950 ppb220.700 ppb - 1.20 ppb
20180.600 ppb110.600 ppb
20190.938 ppb87ND - 2.00 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 150 ppb

The EWG Health Guideline of 150 ppb for toluene 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 harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 1,000 ppb

The legal limit for toluene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.

ppb = parts per billion

All test results

Date Lab ID Result
2014-10-0820851010.500 ppb
2014-10-0820851060.500 ppb
2015-04-21OE2340961.000 ppb
2015-10-14OE3062660.900 ppb
2015-10-14OE3062650.800 ppb
2017-10-18OE5800700.700 ppb
2017-10-18OE5800711.20 ppb
2018-07-11OE6822990.600 ppb