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EWG's Tap Water Database — 2019 UPDATE

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Diquat

California Water Service (CWS) - Salinas

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

 

130

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND180ND
2013ND660ND
2014ND130ND
2015ND70ND
2016ND210ND
2017ND50ND

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
2012-02-019590-103-1124ND
2012-02-019590-106-0959ND
2012-02-019590-123-1323ND
2012-02-029590-102-1138ND
2012-03-089590-046-1103ND
2012-05-039590-106-1150ND
2012-05-109590-103-1109ND
2012-05-179590-104-1352ND
2012-05-229590-102-1112ND
2012-05-229590-123-1156ND
2012-08-169590-102-0938ND
2012-08-169590-103-1427ND
2012-08-239590-123-1139ND
2012-08-309590-106-1254ND
2012-11-149590-102-1115ND
2012-11-149590-103-0958ND
2012-11-159590-106-1301ND
2012-11-199590-123-1018ND
2013-01-109590-005-1109ND
2013-01-109590-008-1015ND
2013-01-109590-009-1424ND
2013-01-309590-010-1130ND
2013-02-209590-103-1415ND
2013-02-209590-104-0959ND
2013-02-219590-020-1023ND
2013-02-219590-046-1151ND
2013-02-219590-102-1004ND
2013-02-269590-018-1046ND
2013-02-269590-019-1435ND
2013-02-279590-106-1249ND
2013-02-279590-123-1142ND
2013-02-289590-015-1126ND
2013-03-059590-014-1151ND
2013-03-059590-022-1433ND
2013-03-059590-024-1507ND
2013-03-059590-026-1331ND
2013-03-079590-017-1009ND
2013-03-079590-023-1335ND
2013-03-079590-027-1035ND
2013-03-279590-006-1409ND
2013-04-049590-028-1346ND
2013-04-049590-030-0952ND
2013-04-049590-037-1031ND
2013-04-119590-043-1429ND
2013-04-129590-041-1157ND
2013-04-309590-029-1431ND
2013-05-029590-106-1014ND
2013-05-099590-102-1251ND
2013-05-149590-103-1316ND
2013-05-149590-123-1556ND
2013-07-089590-005-1403ND
2013-07-109590-008-1402ND
2013-07-109590-009-1056ND
2013-07-179590-006-1352ND
2013-07-179590-010-1137ND
2013-08-079590-106-1159ND
2013-08-079590-123-1018ND
2013-08-089590-019-1154ND
2013-08-089590-102-1257ND
2013-08-089590-103-1034ND
2013-08-169590-020-1554ND
2013-08-209590-104-1101ND
2013-08-229590-014-1033ND
2013-08-229590-017-1258ND
2013-08-229590-046-1027ND
2013-08-279590-015-1239ND
2013-08-279590-018-1303ND
2013-09-119590-026-1454ND
2013-09-139590-022-1308ND
2013-09-189590-024-1451ND
2013-09-189590-027-1008ND
2013-09-209590-023-1556ND
2013-10-119590-030-1254ND
2013-10-179590-029-1139ND
2013-10-229590-028-1131ND
2013-10-229590-043-1419ND
2013-10-239590-037-1133ND
2013-10-239590-041-1107ND
2013-10-299590-039-1412ND
2013-11-069590-106-1538ND
2013-11-079590-102-1258ND
2013-11-079590-103-1350ND
2013-11-149590-123-1329ND
2013-12-189590-131-1112ND
2014-02-129590-102-1313ND
2014-02-129590-103-1400ND
2014-02-129590-123-0927ND
2014-02-199590-106-1135ND
2014-05-079590-102-1415ND
2014-05-079590-103-1458ND
2014-05-139590-123-1023ND
2014-08-049590-102-0905ND
2014-08-049590-103-1413ND
2014-08-049590-123-0935ND
2014-11-129590-102-1022ND
2014-11-129590-103-0956ND
2014-11-129590-123-1403ND
2015-02-079590-102-1102ND
2015-02-079590-103-1048ND
2015-02-079590-123-1136ND
2015-04-219590-008-1358ND
2015-05-149590-102-1552ND
2015-05-149590-103-1508ND
2015-05-149590-123-1433ND
2016-01-079590-009-1044ND
2016-01-079590-020-1006ND
2016-01-209590-018-1242ND
2016-02-049590-027-0944ND
2016-02-099590-104-1216ND
2016-02-109590-006-1206ND
2016-02-229590-024-1517ND
2016-03-019590-037-1250ND
2016-03-039590-015-1424ND
2016-04-059590-022-1342ND
2016-04-279590-041-1037ND
2016-05-039590-026-1256ND
2016-05-049590-017-1422ND
2016-06-289590-023-1350ND
2016-08-029590-019-1100ND
2016-09-149590-106-0907ND
2016-09-209590-046-1104ND
2016-10-059590-029-1002ND
2016-10-059590-030-0903ND
2016-12-079590-043-1443ND
2016-12-299590-008-1413ND
2017-01-199590-014-1048ND
2017-03-029590-132-1100ND
2017-04-059590-005-1428ND
2017-11-219590-131-1240ND
2017-12-149590-132-1456ND