Diquat
California Water Service (CWS) - Los Altos Suburban
Diquat is a herbicide used on potato crops and aquatic weeds.
77
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 34 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 31 | 0 | ND |
| 2018 | ND | 6 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-01-08 | 5810-008-1133 | ND |
| 2014-01-15 | 5810-002-1206 | ND |
| 2014-01-15 | 5810-016-1138 | ND |
| 2014-02-10 | 5810-010-1153 | ND |
| 2014-02-19 | 5810-018-1004 | ND |
| 2014-02-27 | 5810-023-1129 | ND |
| 2014-03-04 | 5810-015-1234 | ND |
| 2014-03-05 | 5810-011-1125 | ND |
| 2014-04-08 | 5810-020-1121 | ND |
| 2014-04-09 | 5810-021-1329 | ND |
| 2014-04-17 | 5810-022-1230 | ND |
| 2014-05-14 | 5810-037-1405 | ND |
| 2014-05-14 | 5810-023-1239 | ND |
| 2014-06-04 | 5810-029-0845 | ND |
| 2014-06-04 | 5810-024-1048 | ND |
| 2014-06-04 | 5810-028-0927 | ND |
| 2014-06-04 | 5810-032-1148 | ND |
| 2014-06-04 | 5810-035-1110 | ND |
| 2014-07-09 | 5810-008-1007 | ND |
| 2014-07-29 | 5810-002-1410 | ND |
| 2014-07-29 | 5810-016-1451 | ND |
| 2014-08-11 | 5810-018-1020 | ND |
| 2014-08-11 | 5810-010-1050 | ND |
| 2014-09-09 | 5810-015-1125 | ND |
| 2014-09-09 | 5810-011-1308 | ND |
| 2014-10-01 | 5810-022-1350 | ND |
| 2014-10-02 | 5810-021-1318 | ND |
| 2014-10-02 | 5810-020-1226 | ND |
| 2014-11-05 | 5810-037-1337 | ND |
| 2014-12-10 | 5810-024-1250 | ND |
| 2014-12-10 | 5810-032-1325 | ND |
| 2014-12-10 | 5810-029-1130 | ND |
| 2014-12-10 | 5810-035-1136 | ND |
| 2014-12-10 | 5810-028-1234 | ND |
| 2015-02-03 | 5810-013-1124 | ND |
| 2015-03-03 | 9590-057-1000 | ND |
| 2015-03-10 | 5810-030-1318 | ND |
| 2015-06-23 | 9590-030-1030 | ND |
| 2015-06-23 | 9590-057-1100 | ND |
| 2015-06-23 | 9590-013-1140 | ND |
| 2017-01-11 | 9590-010-0930 | ND |
| 2017-01-11 | 9590-011-0955 | ND |
| 2017-02-07 | 9590-023-1255 | ND |
| 2017-02-08 | 9590-021-1300 | ND |
| 2017-02-14 | 9590-020-1547 | ND |
| 2017-03-15 | 9590-028-1208 | ND |
| 2017-03-15 | 9590-024-0915 | ND |
| 2017-04-04 | 9590-010-1400 | ND |
| 2017-04-05 | 9590-016-1200 | ND |
| 2017-04-06 | 9590-011-1110 | ND |
| 2017-05-04 | 9590-020-1245 | ND |
| 2017-05-04 | 9590-023-1200 | ND |
| 2017-05-09 | 9590-021-1130 | ND |
| 2017-06-13 | 9590-028-1315 | ND |
| 2017-06-13 | 9590-024-1142 | ND |
| 2017-07-06 | 9590-016-1145 | ND |
| 2017-07-19 | 9590-008-1030 | ND |
| 2017-08-09 | 9590-037-1220 | ND |
| 2017-08-09 | 9590-022-1150 | ND |
| 2017-08-16 | 9590-002-1310 | ND |
| 2017-09-06 | 9590-035-1301 | ND |
| 2017-09-06 | 9590-032-1230 | ND |
| 2017-09-06 | 9590-029-1500 | ND |
| 2017-10-11 | 9590-002-1030 | ND |
| 2017-10-11 | 9590-008-1345 | ND |
| 2017-11-13 | 9590-037-1300 | ND |
| 2017-11-14 | 9590-022-1300 | ND |
| 2017-12-06 | 9590-035-1200 | ND |
| 2017-12-12 | 9590-032-1115 | ND |
| 2017-12-12 | 9590-029-1045 | ND |
| 2017-12-20 | 9590-018-1345 | ND |
| 2018-02-06 | 9590-013-1015 | ND |
| 2018-03-07 | 9590-030-1145 | ND |
| 2018-04-25 | 9590-013-1030 | ND |
| 2018-06-06 | 9590-030-0930 | ND |
| 2018-09-18 | 9590-057-1234 | ND |
| 2018-12-05 | 9590-057-1100 | ND |