Know Your Environment. Protect Your Health.

Diquat

Wattsville Water Authority

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

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND10ND
2020ND10ND
2021ND70ND
2022N/A00N/A
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
2018-01-081801-00078-1ND
2018-01-081801-00078-2ND
2018-01-081801-00078-4ND
2018-05-141805-00261-4ND
2018-08-161808-00271-001ND
2018-08-161808-00271-002ND
2018-08-161808-00271-003ND
2019-04-231904-00356-003ND
2020-04-212004-00292-004ND
2021-01-062101-00069-001ND
2021-01-062101-00069-002ND
2021-01-062101-00069-004ND
2021-05-142105-00311-003ND
2021-08-092108-00147-001ND
2021-08-092108-00147-002ND
2021-08-092108-00147-003ND