Guidance and Technical Tools

Statewide Health Standards

The United States Environmental Protection Agency (EPA) has established maximum contaminant levels (MCL) for the per- and polyfluoroalkyl substances (PFAS) compounds listed below. These MCLs will become the Statewide health standard medium-specific concentration (MSC) values for groundwater effective June 25, 2024.

The new values are:

Click here for a larger version of this table Updated: 7/10/2024

The value published as the MSC for Bromobenzene in Table 1 was converted incorrectly. This value should be 60 µg/L or 0.06 mg/L.

These tables present the revised statewide health standards that were published November 20, 2021 in the Pennsylvania Bulletin. These standards became effective on that date. Any final report or remedial action completion report using the statewide health standard that is submitted on or after November 20, 2021 must demonstrate attainment of the standards in these tables in order to receive the liability relief afforded by Act 2.

Number Please! (XLSM) is a tool to be used to quickly find all information available on the SHS MSCs that apply to a single regulated substance.

Chapter 250: Administration of the Land Recycling Program

Medium Specific Concentrations

On November 20, 2021, revisions to the regulations found at 25 Pa. Code Chapter 250, Administration of the Land Recycling Program (Act 2 cleanup standards), became effective. The Medium Specific Concentrations (MSC) have been updated to incorporate new toxicological information on about 400 chemical substances.

Table 1 - Medium Specific Concentrations (MSCs) for Organic Regulated Substances in Groundwater

Table 1 (PDF)
Table 1 (Excel)

Table 2 - MSCs for Inorganic Substances in Groundwater

Table 2 (PDF)
Table 2 (Excel)

Table 3a - MSCs for Organic Regulated Substances in Soil: Direct Contact Values

Table 3a (PDF)
Table 3a (Excel)

Table 3b - MSCs for Organic Regulated Substances in Soil: Soil-to-Groundwater Values

Table 3b (PDF)
Table 3b (Excel)

Table 4a - MSCs for Inorganic Regulated Substances in Soil: Direct Contact Values

Table 4a (PDF)
Table 4a (Excel)

Table 4b - MSCs for Inorganic Regulated Substances in Soil: Soil-to-Groundwater Values

Table 4b (PDF)
Table 4b (Excel)

Table 5a - Physical and Toxicological Properties: Organic Regulated Substances

Correction: Table 5A of Chapter 250, Appendix A “Physical and Toxicological Properties: Organic Substances” contains incorrect organic carbon-water partition co-efficient (K_oc) values for Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA). The values currently listed in Table 5A are log K_oc and should be K_oc. The numeric values in the MSC tables were not calculated using K_oc values so they do not need to be corrected. The Table 5A K_oc values will be corrected during the next Chapter 250 rulemaking process. The K_oc value corrections for Table 5A are listed below.

Substance	Current Table 5A K_oc	Actual K_oc
Perfluorooctane Sulfonate (PFOS) (CAS: 001763-23-1)	2.57	372
Pefluorooctanoic Acid (PFOA) (CAS: 000335-67-1)	2.06	5