Know Your Environment. Protect Your Health.

MTBE

Chester Water Authority

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND30ND
2021ND20ND
2022ND30ND
2023ND30ND

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
2018-01-092287664001ND
2019-07-103044796001ND
2020-02-0321499840.00ND
2020-05-0122019657.00ND
2020-07-0122412575.00ND
2021-04-0924244246.00ND
2021-07-2824825588.00ND
2022-04-2926461082.00ND
2022-08-0927230367.00ND
2022-11-0827819907.00ND
2023-07-1229299111.00ND
2023-11-0830068041.00ND
2023-11-1530068564.00ND