In June 2019, DHS provided the DNR recommended groundwater standards for 27 substances.
This was the 10th time that Department of National Resources (DNR) has requested the Department of Health Services (DHS) to develop recommended groundwater standards for the protection of public health. The table below summarizes these recommendations and additional details can be found in the letter sent to the DNR. DNR is currently undergoing rulemaking to adopt these recommendations.
|Substance||New or Existing||
Preventive Action Limit
|1,1-Dichloroethane||Existing||No change||850 µg/L||No change||85 µg/L|
|1,2,3-Trichloropropane||Existing||0.3 ng/L||0.03 ng/L|
|1,4-Dioxane||Existing||0.35 µg/L||0.035 ng/L|
|Aluminum||Existing||No change||200 µg/L||No change||20 µg/L|
|Bacteria (E. coli)||New||n/a||0||n/a||0|
|Bacteria (total coliform)||Existing||No change||0||No change||0|
|Barium||Existing||No change||2,000 µg/L||No change||400 µg/L|
|Boron||Existing||2,000 µg/L||400 µg/L|
|Clothianidin||New||n/a||1,000 µg/L||n/a||200 µg/L|
|Cobalt||Existing||No change||40 µg/L||4 µg/L (ii)|
|Dacthal MTP (monomethyl tetrachloroterephthalic acid) and
Dacthal TPA (tetrachloroterephthalic acid) (i)
|New||n/a||70 µg/L||7 µg/L (ii)|
|Glyphosate||New||n/a||10 mg/L||n/a||1 mg/L|
|Glyphosate AMPA (aminomethylphosphonic acid)||New||n/a||10 mg/L||n/a||2 mg/L|
|Hexavalent chromium||New||n/a||70 ng/L||n/a||7 ng/L|
|Imidacloprid||New||n/a||0.2 µg/L||n/a||0.02 µg/L|
Isoxaflutole diketonitrile (DKN)
|New||n/a||3 µg/L||n/a||0.3 µg/L|
|Isoxaflutole benzoic acid (BA)||New||n/a||800 µg/L||n/a||160 µg/L|
|Molybdenum||Existing||No change||40 µg/L||4 µg/L (ii)|
|PFOA (perfluorooctanoic acid) and
PFOS (perfluorooctane sulfonic acid)
|New||n/a||20 ng/L||n/a||2 ng/L|
|Strontium||New||n/a||1,500 µg/L||n/a||150 µg/L|
|Sulfentrazone||New||n/a||1,000 µg/L||n/a||100 µg/L|
|Tetrachloroethylene (PCE)||Existing||20 µg/L||2 µg/L|
|Thiamethoxam||New||n/a||100 µg/L||n/a||10 µg/L|
|Thiencarbazone-methyl||New||n/a||10 mg/L||n/a||2 mg/L|
|Trichloroethylene (TCE)||Existing||0.5 µg/L||0.05 µg/L|
i. These substances are combined with dacthal’s existing enforcement standard.
ii. Although DHS is not recommending a change in the enforcement standard for this substance, we are recommending a change in the preventive action limit.
iii. The recommendations included in this table are reported as micrograms per liter (μg/L) or nanogram per liter (ng/L). You can find more information about these units on our chemicals page.
The Department of Agricultural, Trade and Consumer Protection (DATCP) has fact sheets with information on the pesticides included in Cycle 10.
Our PFAS webpage has information on sources and health effects of PFAS.
The Agency for Toxic Substances and Disease Registry (ATSDR) has fact sheets on health risks of various substances.
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