Glyphosate
Regional Water Authority
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 22 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 31 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2019-05-08 | SOC 200531300 | ND |
| 2019-05-28 | SOC 200533720 | ND |
| 2019-05-28 | SOC 200533719 | ND |
| 2019-05-28 | SOC 200533803 | ND |
| 2019-05-28 | SOC 200533804 | ND |
| 2019-05-28 | SOC 200533660 | ND |
| 2019-05-28 | SOC 200533659 | ND |
| 2019-05-29 | SOC 200533881 | ND |
| 2019-05-29 | SOC 200533880 | ND |
| 2019-05-29 | SOC 200533867 | ND |
| 2019-05-29 | SOC 200533868 | ND |
| 2019-08-26 | SOC 200546198 | ND |
| 2019-08-26 | SOC 200546200 | ND |
| 2019-08-26 | SOC 200546197 | ND |
| 2019-08-27 | SOC 200546267 | ND |
| 2019-08-27 | SOC 200546268 | ND |
| 2019-08-27 | SOC 200546302 | ND |
| 2019-08-27 | SOC 200546303 | ND |
| 2019-08-28 | SOC 200546738 | ND |
| 2019-08-28 | SOC 200546737 | ND |
| 2019-08-28 | SOC 200546736 | ND |
| 2019-08-28 | SOC 200546553 | ND |
| 2022-07-11 | S300210659 300210664 | ND |
| 2022-07-11 | S300210651 300210656 | ND |
| 2022-07-11 | S300210156 300210161 | ND |
| 2022-07-11 | S300210822 300210827 | ND |
| 2022-07-11 | S300210164 300210169 | ND |
| 2022-07-12 | S300211086 300211091 | ND |
| 2022-07-12 | S300211068 300211073 | ND |
| 2022-07-12 | S300211076 300211081 | ND |
| 2022-07-13 | S300212413 300212418 | ND |
| 2022-07-13 | S300212421 300212426 | ND |
| 2022-07-14 | S300212957 300212962 | ND |
| 2022-10-17 | S300258850 300258855 | ND |
| 2022-10-17 | 300258850 300258855B | ND |
| 2022-10-17 | 300258858 300258863B | ND |
| 2022-10-17 | S300258858 300258863 | ND |
| 2022-10-18 | S300258921 300258926 | ND |
| 2022-10-18 | 300258913 300258918B | ND |
| 2022-10-18 | 300258921 300258926B | ND |
| 2022-10-18 | 300259358 300259363B | ND |
| 2022-10-18 | S300259358 300259363 | ND |
| 2022-10-18 | S300259350 300259355 | ND |
| 2022-10-18 | 300259350 300259355B | ND |
| 2022-10-18 | S300258913 300258918 | ND |
| 2022-10-19 | S300259930 300259937 | ND |
| 2022-10-19 | 300259930 300259937B | ND |
| 2022-10-19 | 300259940 300259945B | ND |
| 2022-10-19 | S300259940 300259945 | ND |
| 2022-10-19 | S300260499 300260504 | ND |
| 2022-10-19 | 300260499 300260504B | ND |
| 2022-10-19 | 300260507 300260512B | ND |
| 2022-12-06 | S300281400 300281405 | ND |