Diquat

Bermuda Water Company Inc

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

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	N/A	0	N/A
2016	ND	21	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	16	ND

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
2014-02-12	550-19544-1S	ND
2014-05-19	550-24897-1S	ND
2016-03-14	550-60303-2S	ND
2016-03-14	550-60303-1S	ND
2016-05-23	550-63814-5S	ND
2016-05-23	550-63814-4S	ND
2016-05-23	550-63814-3S	ND
2016-05-23	550-63814-2S	ND
2016-05-23	550-63814-1S	ND
2016-05-24	550-63893-3S	ND
2016-05-24	550-63893-1S	ND
2016-05-24	550-63893-2S	ND
2016-05-31	550-64146-1S	ND
2016-09-19	550-69948-3	ND
2016-09-19	550-69948-9	ND
2016-09-19	550-69948-8	ND
2016-09-19	550-69948-7	ND
2016-09-19	550-69948-6	ND
2016-09-19	550-69948-5T	ND
2016-09-19	550-69948-4	ND
2016-09-19	550-69948-2	ND
2016-09-19	550-69948-1	ND
2016-10-10	550-70906-1	ND
2019-05-13	4296717	ND
2019-05-13	4296713	ND
2019-05-13	4296709	ND
2019-05-14	4297094	ND
2019-05-14	4297090	ND
2019-05-21	4304850	ND
2019-08-26	550-128583-5	ND
2019-08-26	550-128583-3	ND
2019-08-26	550-128583-1	ND
2019-08-28	550-128747-3	ND
2019-08-28	550-128747-2	ND
2019-08-28	550-128747-1	ND
2019-09-04	4410936	ND
2019-09-23	550-130148-2	ND
2019-09-23	550-130148-1 SOC	ND
2019-10-29	550-132382-1	ND