EWG's Tap Water Database — 2021 UPDATE



Great Plains Development Authority

Aluminum is a metal released from metal refineries and mining operations. Too much aluminum exposure can impair children's brain development.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
201441.0 ppb1141.0 ppb
201525.0 ppb1125.0 ppb
201630.0 ppb1130.0 ppb
201774.0 ppb1174.0 ppb
201816.0 ppb1116.0 ppb
201920.0 ppb1120.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 600 ppb

The EWG Health Guideline of 600 ppb for aluminum 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 harm to the brain and nervous system.

ppb = parts per billion

All test results

Date Lab ID Result
2014-04-159695841.0 ppb
2015-04-0630855125.0 ppb
2016-04-1152643130.0 ppb
2017-04-0373302774.0 ppb
2018-04-0293740116.0 ppb
2019-04-08113782420.0 ppb