Know Your Environment. Protect Your Health.

MTBE

North Castle Water District #5

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.

 

8

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
2019N/A00N/A
2020ND20ND
20210.135 ppb21ND - 0.270 ppb
2022ND20ND
2023ND20ND

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
2020-02-25AW03851-POCSND
2020-07-23AW13838-POCSND
2021-03-02AX04050-POCS0.270 ppb
2021-07-06AX13091-POCSND
2022-03-01AY03628-POCSND
2022-07-20AY12577-POCSND
2023-03-21AZ05019-POCSND
2023-09-12AZ16819-POCSND