Know Your Environment. Protect Your Health.

Glyphosate

Patterson Water System

Glyphosate is the weedkiller marketed as Roundup. The state of California classifies glyphosate as a chemical known to cause cancer. Read More.

Glyphosate is classified as a probable human carcinogen by the International Agency for Research on Cancer and has been linked to increased risk of non-Hodgkin’s lymphoma in people. Exposure to glyphosate during pregnancy may affect fetal development.

 

21

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
2022ND10ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 5 ppb

The EWG Health Guideline of 5 ppb for glyphosate was defined by EWG as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

EPA Maximum Contaminant
Level (MCL): 700 ppb

The legal limit for glyphosate, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s. This limit does not account for the cancer risks of glyphosate and does not include any additional consideration of children’s health.

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
2023-01-3035776512001ND
2023-10-0935833383001ND