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EWG's Tap Water Database — 2021 UPDATE

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Diquat

California American Water Company - Monterey

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

MORE ABOUT THIS CONTAMINANT

 

99

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND490ND
2015ND10ND
2016ND60ND
2017ND390ND
2018ND10ND
2019ND30ND

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
2014-01-211225-089-1140ND
2014-01-221225-092-1145ND
2014-02-121225-047-1355ND
2014-02-121225-046-1340ND
2014-02-181225-044-1400ND
2014-02-181225-017-1335ND
2014-02-181225-054-1230ND
2014-02-181225-045-1210ND
2014-02-191225-033-1320ND
2014-02-201225-016-1300ND
2014-04-081225-082-1155ND
2014-04-161225-051-1335ND
2014-04-161225-029-1250ND
2014-04-221225-050-1130ND
2014-04-241225-092-1005ND
2014-04-241225-024-0900ND
2014-04-291225-089-1030ND
2014-05-131225-016-1240ND
2014-05-131225-017-1300ND
2014-05-141225-047-1305ND
2014-05-141225-046-1250ND
2014-05-191225-054-0930ND
2014-05-201225-045-1350ND
2014-05-201225-044-1130ND
2014-06-091225-074-1100ND
2014-06-091225-073-0945ND
2014-06-091225-072-0915ND
2014-06-091225-002-1045ND
2014-06-111225-006-1330ND
2014-06-111225-026-0915ND
2014-06-231225-052-1150ND
2014-06-231225-020-1030ND
2014-07-101225-033-1200ND
2014-07-141225-082-1300ND
2014-07-151225-029-1005ND
2014-07-151225-051-0910ND
2014-07-281225-048-1110ND
2014-07-281225-050-1030ND
2014-07-311225-024-1325ND
2014-09-041225-073-0945ND
2014-09-041225-072-0845ND
2014-09-091225-074-1230ND
2014-09-091225-026-1045ND
2014-09-221225-020-1045ND
2014-09-221225-052-0900ND
2014-09-221225-002-0915ND
2014-09-301225-006-0940ND
2014-10-081225-033-1030ND
2014-10-201225-048-1000ND
2015-07-221225-070-0930ND
2016-01-205810-087-1055ND
2016-05-181225-087-1045ND
2016-08-171225-087-1330ND
2016-08-221225-070-1010ND
2016-10-121225-087-0930ND
2016-10-121225-070-1325ND
2017-02-081225-047-1415ND
2017-02-081225-046-1430ND
2017-02-081225-045-1007ND
2017-02-081225-044-1020ND
2017-02-081225-017-1330ND
2017-02-081225-016-1048ND
2017-03-021225-024-1145ND
2017-03-081225-082-1108ND
2017-03-141225-051-1400ND
2017-03-141225-050-1310ND
2017-03-171225-048-1226ND
2017-04-061225-073-0900ND
2017-04-061225-026-0930ND
2017-04-061225-072-1030ND
2017-04-061225-052-1000ND
2017-04-071225-006-0900ND
2017-04-071225-002-0940ND
2017-04-071225-074-0915ND
2017-05-041225-017-1100ND
2017-05-041225-016-1130ND
2017-05-051225-047-0945ND
2017-05-051225-046-0930ND
2017-05-051225-045-1000ND
2017-05-101225-044-1346ND
2017-05-101225-087-1425ND
2017-06-021225-050-1436ND
2017-06-121225-048-0850ND
2017-06-131225-024-1110ND
2017-06-141225-051-0900ND
2017-06-141225-082-1208ND
2017-07-111225-072-0930ND
2017-07-111225-073-1000ND
2017-07-121225-002-1030ND
2017-07-121225-074-0945ND
2017-07-121225-006-0905ND
2017-07-171225-052-0845ND
2017-08-141225-087-1230ND
2017-08-181225-029-1200ND
2017-12-201225-026-0900ND
2018-01-221225-029-1000ND
2019-08-081225-070-1537ND
2019-10-101225-088-1630ND
2019-12-021225-070-1510ND