Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Diquat

Chino Basin Desalter Authority - Desalter 1

Diquat is a herbicide used on potato crops and aquatic weeds.

MORE ABOUT THIS CONTAMINANT

 

88

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND130ND
2015ND100ND
2016ND150ND
2017ND160ND
2018ND170ND
2019ND170ND

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
2014-07-023334-001-0845ND
2014-07-023334-002-0745ND
2014-07-023334-004-0600ND
2014-07-093334-008-0745ND
2014-07-093334-005-0645ND
2014-07-093334-007-0915ND
2014-07-093334-006-0845ND
2014-07-163334-013-0915ND
2014-07-163334-011-0800ND
2014-07-163334-010-0700ND
2014-07-163334-009-0600ND
2014-07-233334-015-0600ND
2014-08-133334-014-0900ND
2015-07-083334-011-1123ND
2015-07-083334-008-0820ND
2015-07-083334-009-0915ND
2015-07-083334-005-0730ND
2015-07-083334-010-1020ND
2015-07-153334-021-0650ND
2015-07-223334-006-1122ND
2015-07-223334-013-0945ND
2015-07-223334-007-1045ND
2015-07-223334-014-0853ND
2016-05-033334-015-0732ND
2016-07-063334-009-0800ND
2016-07-063334-005-0600ND
2016-07-063334-010-0910ND
2016-07-063334-008-0650ND
2016-07-133334-021-0800ND
2016-07-133334-007-0630ND
2016-07-133334-006-0700ND
2016-07-203334-011-0700ND
2016-07-203334-020-1000ND
2016-07-203334-013-0800ND
2016-07-203334-014-0900ND
2016-07-273334-001-0700ND
2016-07-273334-004-0845ND
2016-07-273334-002-0730ND
2017-07-053334-009-1030ND
2017-07-053334-010-1130ND
2017-07-053334-008-0815ND
2017-07-053334-005-0940ND
2017-07-123334-023-0930ND
2017-07-123334-024-0630ND
2017-07-123334-020-0600ND
2017-07-193334-011-0530ND
2017-07-193334-014-0730ND
2017-07-193334-015-0830ND
2017-07-193334-013-0630ND
2017-07-263334-006-0900ND
2017-07-263334-021-0700ND
2017-07-263334-007-0930ND
2017-08-023334-001-0700ND
2017-08-043334-004-0815ND
2018-07-123334-006-0930ND
2018-07-123334-007-1050ND
2018-07-123334-021-0700ND
2018-07-173334-005-0830ND
2018-07-173334-010-1100ND
2018-07-173334-008-0715ND
2018-07-173334-009-1015ND
2018-07-243334-014-0800ND
2018-07-243334-013-0720ND
2018-07-243334-015-0900ND
2018-07-243334-011-0635ND
2018-07-313334-001-0445ND
2018-07-313334-002-0530ND
2018-07-313334-004-0830ND
2018-08-073334-023-0945ND
2018-08-073334-024-1030ND
2018-08-143334-020-0730ND
2019-07-103334-001-1015ND
2019-07-103334-002-0915ND
2019-07-103334-004-1100ND
2019-07-243334-013-0930ND
2019-07-243334-014-0900ND
2019-07-243334-011-0830ND
2019-07-243334-015-1000ND
2019-07-313334-006-1000ND
2019-07-313334-007-0900ND
2019-07-313334-021-0945ND
2019-08-073334-024-0730ND
2019-08-073334-023-0800ND
2019-08-143334-020-0830ND
2019-08-193334-005-0940ND
2019-08-193334-010-0910ND
2019-08-193334-009-0920ND
2019-08-193334-008-0930ND