Know Your Environment. Protect Your Health.

MTBE

Deforest Waterworks

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201811.0 ppb227.00 ppb - 15.0 ppb
20195.95 ppb224.60 ppb - 7.30 ppb
20204.15 ppb222.80 ppb - 5.50 ppb
20218.45 ppb223.90 ppb - 13.0 ppb
20229.27 ppb337.40 ppb - 11.0 ppb
20233.66 ppb125ND - 14.0 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
2018-03-1310449297.00 ppb
2018-08-2940400700115.0 ppb
2019-06-1911293314.60 ppb
2019-09-1011468007.30 ppb
2020-06-0211911072.80 ppb
2020-08-3112109745.50 ppb
2021-04-13124861113.0 ppb
2021-08-2512739643.90 ppb
2022-07-2613262269.40 ppb
2022-08-2313315567.40 ppb
2022-08-23133155511.0 ppb
2023-03-21669282001ND
2023-03-2166928300111.0 ppb
2023-06-08682743001ND
2023-06-086827450015.90 ppb
2023-07-25691015001ND
2023-07-25691015002ND
2023-09-07698953003ND
2023-09-0769895300114.0 ppb
2023-09-19701205001ND
2023-09-197012080018.20 ppb
2023-12-12714406002ND
2023-12-127144060014.80 ppb