Know Your Environment. Protect Your Health.

Monochlorobenzene (chlorobenzene)

Northwest Harris County Municipal Utility District 21

NOTE: Northwest Harris County Municipal Utility District 21 purchases water from North Harris County Regional Water Authority which is required to test for monochlorobenzene (chlorobenzene). Sample information shown below was taken by North Harris County Regional Water Authority.

Monochlorobenzene is used as a solvent for pesticides, a degreasing agent and an intermediate for manufacturing other chemicals. It causes liver and kidney damage in studies of laboratory animals.

 

0

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND10ND
2021ND10ND
2022ND10ND
2023ND10ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 70 ppb

The EWG Health Guideline of 70 ppb for monochlorobenzene 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 harm to internal organs.

EPA Maximum Contaminant
Level (MCL): 100 ppb

The legal limit for monochlorobenzene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1960s.

ppb = parts per billion

All test results

NOTE: Northwest Harris County Municipal Utility District 21 purchases water from North Harris County Regional Water Authority which is required to test for monochlorobenzene (chlorobenzene). Sample information shown below was taken by North Harris County Regional Water Authority.

Date Lab ID Result