EWG's Tap Water Database — 2021 UPDATE


Bromochloroacetic acid

Vallecitos Water District

Bromochloroacetic acid is formed when chlorine or other disinfectants are used to treat drinking water. Bromochloroacetic acid and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20141.38 ppb2219ND - 2.70 ppb
20150.958 ppb2415ND - 2.10 ppb
20161.42 ppb1815ND - 2.60 ppb
20172.58 ppb20201.10 ppb - 3.60 ppb
20181.80 ppb2221ND - 3.30 ppb
20193.36 ppb18181.70 ppb - 7.20 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.02 ppb

The EWG Health Guideline of 0.02 ppb for bromochloroacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result