Diquat
East Lyme Water & Sewer Commission
Diquat is a herbicide used on potato crops and aquatic weeds.
31
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 4 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 10 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 10 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 6 ppb
The EWG Health Guideline of 6 ppb for diquat 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 cataracts.
EPA Maximum Contaminant
Level (MCL) 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-03-10 | 92358CH | ND |
| 2014-05-28 | 93604CH | ND |
| 2014-08-21 | 94921CH | ND |
| 2014-12-15 | 96642CH | ND |
| 2015-02-25 | 97570CH | ND |
| 2015-06-01 | 99107CH | ND |
| 2015-09-22 | 101180CH | ND |
| 2015-11-18 | 102195CH | ND |
| 2016-01-27 | 103277CH | ND |
| 2016-01-27 | 103279CH | ND |
| 2016-06-08 | 105496CH | ND |
| 2016-06-08 | 105494CH | ND |
| 2016-06-14 | 105580CH | ND |
| 2016-08-01 | 106397GE | ND |
| 2016-09-15 | 107184GE | ND |
| 2016-09-15 | 107182GE | ND |
| 2016-12-06 | 108641GE | ND |
| 2016-12-06 | 108643GE | ND |
| 2018-05-29 | 117974GE | ND |
| 2018-05-29 | 117976GE | ND |
| 2018-05-29 | 117978GE | ND |
| 2019-09-09 | SOC 200547920 | ND |
| 2019-09-09 | SOC 200547919 | ND |
| 2019-09-09 | SOC 200547920B | ND |
| 2019-09-09 | SOC 200547921 | ND |
| 2019-12-12 | SOC 200560024 | ND |
| 2019-12-12 | SOC 200560025 | ND |
| 2019-12-23 | SOC 200561104 | ND |
| 2019-12-27 | SOC 200561241 | ND |
| 2019-12-27 | SOC 200561242 | ND |
| 2019-12-27 | SOC 200561243 | ND |