Know Your Environment. Protect Your Health.

Diquat

Washington Ridge C.c.

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

 

11

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND30ND
2020ND10ND
2021N/A00N/A
2022ND30ND
2023N/A00N/A

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-21CA2910013_005_005-201803210800ND
2018-06-06CA2910013_005_005-201806061000ND
2018-07-18CA2910013_005_005-201807180930ND
2018-11-27CA2910013_005_005-201811271000ND
2019-03-27CA2910013_003_003-201903270845ND
2019-03-27CA2910013_005_005-201903270900ND
2019-03-27CA2910013_002_002-201903270830ND
2020-06-16CA2910013_005_005-202006161330ND
2022-03-08CA2910013_003_003-202203081111ND
2022-03-08CA2910013_002_002-202203081033ND
2022-03-08CA2910013_005_005-202203081138ND