Know Your Environment. Protect Your Health.

MTBE

North Concord LLC

MTBE was used as gasoline oxygenation additive to boost the octane number. In 2005, MTBE was replaced by ethanol as a gasoline additive. MTBE causes cancers in rats.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.30 ppb112.30 ppb
20193.90 ppb113.90 ppb
20203.80 ppb113.80 ppb
20212.90 ppb112.90 ppb
20223.20 ppb113.20 ppb
20234.10 ppb114.10 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 13 ppb

The EWG Health Guideline of 13 ppb for MTBE 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.

ppb = parts per billion

All test results

Date Lab ID Result
2018-07-18118071898.012.30 ppb
2019-09-03119090104.013.90 ppb
2020-08-20120082421.013.80 ppb
2021-09-01121090202.012.90 ppb
2022-07-05122070337.013.20 ppb
2023-07-05123070266.014.10 ppb