Know Your Environment. Protect Your Health.

MTBE

River Lake Subdivision

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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
20196.90 ppb116.90 ppb
20206.30 ppb116.30 ppb
20214.80 ppb224.80 ppb
20225.15 ppb224.90 ppb - 5.40 ppb
20235.60 ppb115.60 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
2019-09-045088956.90 ppb
2020-12-145518836.30 ppb
2021-03-165580794.80 ppb
2021-03-165580794.80 ppb
2022-02-145849495.40 ppb
2022-04-285893314.90 ppb
2023-07-246205475.60 ppb