Know Your Environment. Protect Your Health.

MTBE

Marston 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.

 

38

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20186.05 ppb444.72 ppb - 6.73 ppb
20192.82 ppb42ND - 5.77 ppb
20202.65 ppb63ND - 6.59 ppb
20217.47 ppb885.07 ppb - 10.1 ppb
20224.90 ppb86ND - 7.91 ppb
20237.61 ppb886.43 ppb - 8.78 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
2018-03-06AD175236.70 ppb
2018-05-02AD186716.73 ppb
2018-07-11AD295906.03 ppb
2018-10-11AD350684.72 ppb
2019-01-08AD383815.50 ppb
2019-04-10AD46672ND
2019-07-11AD527175.77 ppb
2019-10-17AD57379ND
2020-01-12AD60699ND
2020-01-12AD606986.59 ppb
2020-07-152011774ND
2020-07-152012319ND
2020-10-1820166444.20 ppb
2020-10-1820166455.13 ppb
2021-01-1020202435.07 ppb
2021-01-1020202446.63 ppb
2021-04-12210385710.1 ppb
2021-04-1221038568.05 ppb
2021-07-1121138679.17 ppb
2021-07-1121138667.29 ppb
2021-10-1821181767.37 ppb
2021-10-1821181756.05 ppb
2022-01-1221216787.54 ppb
2022-01-1221216775.93 ppb
2022-04-1322044146.42 ppb
2022-04-1322044157.91 ppb
2022-07-1822148675.00 ppb
2022-07-1822148686.38 ppb
2022-10-102219710ND
2022-10-102219709ND
2023-01-0822233797.96 ppb
2023-01-0822233786.48 ppb
2023-04-1223035458.78 ppb
2023-04-1223035448.01 ppb
2023-07-1923117767.44 ppb
2023-07-1923117777.96 ppb
2023-10-1823168876.43 ppb
2023-10-1823168887.83 ppb