Glyphosate
CTWC - Shoreline Region-Guilford 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 11 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 15 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
|---|---|---|
| 2014-06-12 | 140612CWCSOC5 | ND |
| 2014-09-16 | 141015-0009SOC5 | ND |
| 2014-09-16 | 3104518 | ND |
| 2014-11-03 | 3132507 | ND |
| 2014-12-11 | 3153931 | ND |
| 2015-06-03 | BJ25400SOC5 | ND |
| 2015-07-27 | BJ63961SOC5 | ND |
| 2015-10-19 | BK10283SOC5 | ND |
| 2016-01-21 | BK55954SOC5 | ND |
| 2016-01-21 | BK55943SOC5 | ND |
| 2016-01-21 | BK55941SOC5 | ND |
| 2016-01-25 | BK57134SOC5 | ND |
| 2016-03-14 | BK78127SOC5 | ND |
| 2016-05-04 | BN25256SOC5 | ND |
| 2016-06-01 | BN44892SOC5 | ND |
| 2016-06-01 | BN44876SOC5 | ND |
| 2016-07-12 | BN71477SOC5 | ND |
| 2016-07-19 | BN75784SOC5 | ND |
| 2016-07-19 | BN75782SOC5 | ND |
| 2018-07-09 | CA86688 | ND |
| 2019-01-30 | SOC 200520057 | ND |
| 2019-06-06 | SOC 200535308 | ND |
| 2019-06-06 | SOC 200535309 | ND |
| 2019-06-11 | SOC 200536055 | ND |
| 2019-06-11 | SOC 200536054 | ND |
| 2019-06-19 | SOC 200542695 | ND |
| 2019-06-24 | SOC 200537520 | ND |
| 2019-07-29 | SOC 200542348 | ND |
| 2019-07-30 | SOC 200542453 | ND |
| 2019-07-31 | SOC 200542480 | ND |
| 2019-07-31 | SOC 200542466 | ND |
| 2019-07-31 | SOC 200542497 | ND |
| 2019-07-31 | SOC 200542499 | ND |
| 2019-07-31 | SOC 200542468 | ND |
| 2019-08-14 | SOC 200544869 | ND |