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Environmental Health Division
Health Risk Limits Rules for Groundwater
Rules Amendments - Contaminants
August 2023
MDH proposes amendments to the Health Risk Limits (HRLs) Rules approximately every two years. This allows new and updated human health-based water guidance values to be considered for adoption into rule. The current regular rulemaking began in January 2021 and is under OAH review.
In June 2023, the Minnesota Legislature passed a session law that requires Minnesota Department of Health to "...amend the health risk limit for perfluorooctane sulfonate (PFOS) in Minnesota Rules, part 4717.7860, subpart 15, so that the health risk limit does not exceed 0.015 parts per billion..." (Laws of Minnesota, Chapter 60, Article 3, Section 34) This rulemaking will begin in August 2023 with an expected end date of 2026, per session law.
The water guidance values for the contaminants listed below are under consideration for the Health Risk Limits Rules amendment process. The first list is for the current regular rulemaking and the second list is for the additional Session Law rulemaking. MDH is interested in comments on the proposed values for these contaminants. MDH welcomes comments or concerns at any time by contacting MDH at health.risk@state.mn.us or 651-201-4899.
Contaminants included in Regular Rulemaking for Health Risk Limits (estimated timeframe: 2021-2023)
Contaminants in Regular Rulemaking for Health Risk Limits (estimated timeframe: 2021-2023)
| Chemical Abstract Service (CAS) Number | Chemical Name | Previously adopted values in HRL Rule? (year adopted) |
| 67-64-1 | Acetone | Yes (2011) |
| 1066-51-9 | Aminomethylphosphonic acid (AMPA) | No |
| 50-32-8 | No | |
| 119-61-9 | Benzophenone | No |
| 95-14-7 | 1H-Benzotriazole | No |
| 95-52-4 | Biphenyl | Yes (1993) |
| 75-27-4 | Bromodichloromethane | Yes (1993) |
| 106-46-7 | 1,4-Dichlorobenzene | Yes (1994) |
| 156-60-5 | trans-1,2-Dichloroethene | Yes (2013) |
| 75-35-4 | 1,1-Dichloroethylene | Yes (2011) |
| 78-87-5 | 1,2-Dichloropropane | Yes (1994) |
| 57-63-6 | 17α-Ethinylestradiol | No |
| 100-41-4 | Ethylbenzene | Yes (2011) |
| 107-21-1 | Ethylene Glycol | Yes (2011) |
| 86-73-7 | Fluorene | Yes (1993) |
| 72178-02-0 | Fomesafen | No |
| 110-54-3 | n-Hexane (Repeal only - replace with Risk Assessment Advice) | Yes (1994) |
| 138261-41-3 | Imidacloprid | No |
| 7439-96-5 | Manganese | Yes (1993) |
| 51218-45-2; 87392-12-9 | Metolachlor and s-Metolachlor | Yes (2011) |
| 171118-09-5 | Metolachlor ESA | Yes (2011) |
| 152019-73-3 | Metolachlor OXA | Yes (2011) |
| 84852-15-3 | Nonylphenol | No |
| 140-66-9 | 4-tert-Octylphenol | No |
| 45187-15-3; 375-73-5; 29420-49-3; 68259-10-9; 60453-92-1 | Perfluorobutane sulfonate (PFBS) | Yes (2011) |
| 108427-53-8; 355-46-4; 3871-99-6 | Perfluorohexane sulfonate (PFHxS) | No |
| 92612-52-7; 307-24-4; 21615-47-4; 2923-26-4 | Perfluorohexanoate (PFHxA) | No |
| 91-22-5 | Quinoline | No |
| 127-18-4 | Tetrachloroethylene (PERC or PCE) | Yes (HRLMCL 2009) |
| 108-88-3 | Toluene | Yes (2011) |
| 526-73-8 | 1,2,3-Trimethylbenzene | No |
| 95-63-6 | 1,2,4-Trimethylbenzene | No |
| 108-67-8 | 1,3,5-Trimethylbenzene | Yes (2009) |
| 78-51-3 | Tris(2-butoxyethyl) phosphate (TBEP) | No |
| 13674-87-8 | Tris(1,3-dichloroisopropyl) phosphate (TDCPP) | No |
| 93413-69-5; 99300-78-4 | Venlafaxine | No |
| 1330-20-7 | Xylenes | Yes (2011) |
Contaminants included in Additional Session Law Rulemaking for Health Risk Limits (estimated timeframe: 2023-2026)
| Chemical Abstract Service (CAS) Number | Chemical Name | Previously adopted values in HRL Rule? (year adopted) |
| 1897-45-6 | Chlorothalonil | Yes (1994) |
| 106-93-4 | 1,2-Dibromoethane (ethylene dibromide, EDB) | Yes (1993) |
| 45298-90-6; 1763-23-1; 29081-56-9; 70225-14-8; 2795-39-3; 9457-72-5 | Perfluorooctane Sulfonate (PFOS) (updated value pending - See Health Risk Limits Rules for Groundwater Rules Amendments - PFOS Update) | Yes (2009) |