Health Risk Limit Rules for Groundwater
2014/2015 Amendments - Contaminants

June 2014:

The chemical water contaminants listed below have been detected in Minnesota waters. MDH is considering adopting recently derived health-based guidance values for these contaminants into Minnesota Rules, chapter 4717, part 7860.

The amendments would add HRL values for eight groundwater contaminants to the existing rule and update (replace) HRL values published in 1993 or 2009 for six additional contaminants. The HRL values for each chemical in the proposed amendments are identical to the Health-Based Values (HBVs) that appear currently in the Human Health-Based Water Guidance Table. This list is subject to change. Please check back for updates.

Please click on the links below for more information about the health-based guidance values for each chemical water contaminant below.

Chemical Abstract Service
(CAS) Number
Chemical Name
Previously adopted values in HRL Rule? (year adopted)

103-90-2

Acetaminophen*

No

79-06-1

Acrylamide

No

25057-89-0

Bentazon

No

80-05-7

Bisphenol A

No

85-68-7

Butyl benzyl phthalate (BBP)

Yes (1993)

7440-43-9

Cadmium

Yes (1993)

84-74-2

Dibutyl phthalate (DBP)

Yes (1993)

117-81-7

Di (2-ethylhexyl) phthalate (DEHP)

Yes
(2009 MCL-Based HRL)

87674-68-8

Dimethenamid

No

163515-14-8

Dimethenamid-p

No

87-86-5

Pentachlorophenol (PCP)

Yes
(2009 MCL-Based HRL)

57-68-1

Sulfamethazine

No

79-01-6

1,1,2-Trichloroethylene (TCE)

Yes
(2009 MCL-Based HRL)

3380-34-5

Triclosan

No


* Acetaminophen was recently reported in groundwater in a US Geological Survey/Minnesota Pollution Control Agency study called "Contaminants of emerging concern in ambient groundwater in urbanized areas of Minnesota, 2009-12," making acetaminophen eligible for the Health Risk Limits Rules. This chemical is currently under re-evaluation. Result of the re-evaulation will be published prior to rulemaking.

MCL = Environmental Protection Agency's Maximum Contaminant Level

Updated Thursday, August 28, 2014 at 10:22AM