Know Your Environment. Protect Your Health.

Pentachlorophenol

Patterson Water System

Pentachlorophenol is a carcinogenic chemical used as a wood preservative. It harms developing fetuses, and causes immune suppression and hormone disruption.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND80ND
2020ND40ND
2021ND20ND
2022ND20ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.3 ppb

The EWG Health Guideline of 0.3 ppb for pentachlorophenol 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.

EPA Maximum Contaminant
Level (MCL): 1 ppb

The legal limit for pentachlorophenol, established in 1991, was based on analytical detection limits at the time that the standard was set.

ppb = parts per billion

All test results

Date Lab ID Result
2018-01-2535370415002ND
2018-01-2535370415002ND
2018-07-0935403035001ND
2018-07-0935403035001ND
2019-01-1535442674001ND
2019-01-1535442674001ND
2019-07-0935480730001ND
2019-07-0935480730001ND
2019-07-2435484856001ND
2019-07-2435484856001ND
2019-10-2235507344001ND
2019-10-2235507344001ND
2020-01-0735522572001ND
2020-01-0735522572002ND
2020-04-1435544199001ND
2020-09-2835581278001ND
2021-03-2535621782001ND
2021-11-3035681445001ND
2022-01-0635688920001ND
2022-07-2835735506001ND
2023-09-2735830712001ND
2023-10-0935833383001ND