EWG's Tap Water Database — 2021 UPDATE



Oakboro, Town of

1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20141.09 ppb111.09 ppb
20151.13 ppb111.13 ppb
20161.27 ppb331.20 ppb - 1.40 ppb
20171.40 ppb111.40 ppb
20181.10 ppb111.10 ppb
20191.30 ppb111.30 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 70 ppb

The legal limit for cis-1,2-dichloroethylene, 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
2014-03-0714030882-011.09 ppb
2015-02-061.13 ppb
2016-01-08160107351.20 ppb
2016-04-293544341.20 ppb
2016-08-0222572-011.40 ppb
2017-03-2032291-011.40 ppb
2018-03-0747802-01 1.10 ppb
2019-03-0863990-01 1.30 ppb