SS 029-21 Scope Statement

Policy alternatives

Section 160.07(5), Wis. Stats., directs the department to propose rules establishing DHS recommendations for ES for substances of public health concern. Without numerical health based standards, groundwater regulatory programs would be unable to protect the public health of Wisconsin residents.

4. Detailed explanation of statutory authority for the rule (including the statutory citation and language):

The DNR's statutory authority to establish state groundwater quality standards is contained in ch. 160, Wis. Stats., and ss. 281.12(1), and, 281.19(1), Wis. Stats.

Chapter 160, Wis. Stats., establishes an administrative process for developing numerical state groundwater quality standards to be used as criteria for the protection of public health and welfare by all state groundwater regulatory programs. Chapter 160, Wis. Stats., directs the DNR to use this administrative process to establish numeric groundwater quality standards for substances of public health or welfare concern found in, or having a reasonable probability of entering, the groundwater resources of the state.

5. Estimate of amount of time that state employees will spend developing the rule and of other resources necessary to develop the rule:

The estimated staff time needed to develop these amendments to ch. NR 140, Wis. Adm. Code, is approximately 925 hours (over an anticipated 3 year period).

6. List with description of all entities that may be affected by the proposed rule:

The proposed groundwater standards would apply to all regulated facilities, practices and activities that may impact groundwater quality.

Once adopted, the numerical groundwater standards become the criteria for protecting public health, and are used in the regulation of:

- Solid and hazardous wastes

- Spills and remediation sites

- Wastewater and biosolids

- Septic systems (land treatment of septage)

- Pesticide use, storage and mixing

7. Summary and preliminary comparison with any existing or proposed federal regulation that is intended to address the activities to be regulated by the proposed rule :

The United States Environmental Protection Agency (US EPA) establishes health based drinking water maximum contaminant levels (MCLs) and health advisories (HA). Federal MCLs, applicable at public water supply systems, are established based on scientific risk assessments and, in some cases, economic and technological considerations. Federal HAs provide information on contaminants that can cause human health effects and are known or anticipated to occur in drinking water. EPA's HAs are non-enforceable and provide technical guidance to state agencies and other public health officials on health effects, analytical methodologies, and treatment technologies associated with drinking water contamination.

The administrative process established in ch. 160, Wis. Stats., for developing numerical state groundwater quality standards for substances of public health concern requires that DHS base their recommendations for standards on existing federal numbers. Federal numbers, as defined in ch. 160, Wis. Stats., include MCLs, HAs and established cancer risk levels. In cases where a federal number does not exist for a substance, DHS uses reference doses (RfDs) and acceptable daily intake (ADI) values to develop their recommendations for standards.

8. Anticipated economic impact of implementing the rule (note if the rule is likely to have a significant economic impact on small businesses):

The anticipated economic impact of this rule, based on the need for regulated entities to perform additional sampling and analysis, is moderate (up to $5 million/year). Economic impacts may depend on whether regulated entities are already required to take action for existing standards contained in ch. NR 140, Wis. Adm. Code. If existing standards in ch. NR 140, Wis. Adm. Code, have not been exceeded by a particular facility, practice or activity, then the new standards proposed in this rule may require additional actions that will cause economic impact beyond the current situation. If existing ch. NR 140, Wis. Adm. Code, standards have been exceeded by a particular facility, practice or activity, concurrent monitoring or remedial action for existing standards and the new standards proposed in this rule are not likely to increase compliance costs. It is anticipated that there will be few cases where the proposed standards will be exceeded where existing standards are not already being exceeded. As a result, the anticipated economic impact of this rule is at the lower end of the estimated range of impacts and the workload of state regulatory agencies should not change substantially. The addition of new or revised ch. NR 140, Wis. Adm. Code, groundwater quality standards does not trigger additional monitoring at public water supply systems.

Specific economic impacts on small businesses are indeterminant until the rule is drafted. Small businesses that are sources of the substances for the proposed groundwater standards are, for the most part, likely sources of substances for which groundwater standards already exist. Consequently, there should be few cases where the proposed standards would be exceeded where existing standards are not already being exceeded.

Chapter NR 140, Wis. Adm. Code, currently contains groundwater standards for 138 substances of public health concern, 8 substances of public welfare concern and 15 indicator parameters.

State groundwater quality standards protect both public health and welfare. There are significant cost savings to reducing exposure to contaminants which are known to cause disease and premature death and that may enter groundwater drinking water supplies. Human health impacts and drinking water treatment system costs to remove contamination may be avoided when groundwater pollution is reduced or eliminated. Adoption of groundwater quality rules and regulations by state regulatory programs minimizes the concentrations of polluting substances in groundwater, minimizes water treatment system costs and health care costs, while safeguarding public health and welfare.

9. Anticipated number, month and locations of public hearings:

The Department anticipates holding 5 public hearings in the month of September 2022. Hearings will be held simultaneously by videoconference. Anticipated hearing locations are Madison, Eau Claire, Rhinelander, Oshkosh and LaCrosse.

The Department will hold these hearings in these locations to gather stakeholder input on a rule package that is used widely statewide.

Contact Person: Bruce Rheineck, [phone]