Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Diquat

Rockford

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

 

44

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND20ND
2014ND160ND
2015ND20ND
2016ND30ND
2017ND160ND

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
2012-01-242012864-02ND
2012-03-222032567-01ND
2012-03-222032563-01ND
2012-03-222032563-02ND
2012-05-152052166-02ND
2013-03-123031609-01ND
2013-06-253063688-01ND
2014-01-224012700-01ND
2014-01-224012700-02ND
2014-01-274013503-02ND
2014-01-284013503-01ND
2014-02-184022291-01ND
2014-02-184022289-01ND
2014-03-254033199-01ND
2014-04-214043529-05ND
2014-04-214043529-04ND
2014-04-214043529-02ND
2014-04-224043529-03ND
2014-04-224043529-06ND
2014-04-234043529-01ND
2014-04-294044304-01ND
2014-10-284104356-01ND
2014-12-124122805-01ND
2015-02-065021724-01ND
2015-04-085041270-01ND
2016-01-066010756-01ND
2016-04-136042243-01ND
2016-12-146122211-01ND
2017-01-067011622-01ND
2017-01-137012603-01ND
2017-01-137012600-01ND
2017-01-207013468-01ND
2017-02-157022428-01ND
2017-03-087031384-01ND
2017-06-027061425-01ND
2017-06-027061425-03ND
2017-06-097062750-02ND
2017-06-097062750-05ND
2017-06-097062750-03ND
2017-06-097062750-01ND
2017-06-287065205-03ND
2017-06-287065205-01ND
2017-08-047082231-01ND
2017-12-067121184-03ND