Know Your Environment. Protect Your Health.

MTBE

Chaffee PWS

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.57 ppb43ND - 2.74 ppb
20191.51 ppb42ND - 3.44 ppb
2020ND30ND
20211.16 ppb42ND - 2.41 ppb
20221.58 ppb43ND - 2.34 ppb
20231.04 ppb42ND - 2.27 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
2018-01-10AD120501.29 ppb
2018-05-06AD18663ND
2018-07-16AD295402.74 ppb
2018-10-15AD350602.26 ppb
2019-01-09AD383722.60 ppb
2019-04-08AD46663ND
2019-07-10AD527093.44 ppb
2019-10-20AD57371ND
2020-01-13AD60690ND
2020-07-152011704ND
2020-10-182016623ND
2021-01-1120202222.24 ppb
2021-04-122103835ND
2021-07-122113757ND
2021-10-1921181512.41 ppb
2022-01-0521216472.14 ppb
2022-04-1322043882.34 ppb
2022-07-1122148031.82 ppb
2022-10-092219685ND
2023-01-0922233541.88 ppb
2023-04-1223034952.27 ppb
2023-07-162311711ND
2023-10-182316866ND