Know Your Environment. Protect Your Health.

Diquat

Boise City Public Works Authority

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

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND10ND
2020ND20ND
2021ND10ND
2022ND20ND
2023ND20ND

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
2018-02-13AB14013-01ND
2018-04-17AD18027-01ND
2018-07-25AG26009-01ND
2018-10-09AJ10020-01ND
2019-01-14BA16019-01ND
2020-01-28CA29007-01ND
2020-01-28CA29007-03ND
2021-04-07DD08012-01ND
2022-08-08EH09140-03ND
2022-08-09EH09140-01ND
2023-03-20FC21016-02ND
2023-08-14FH15057-01ND