METHYL ISOCYANATE cleanup levels in Pennsylvania
- PA DEP
- Act 2 Statewide Health Standards
- CAS 624-83-9
For METHYL ISOCYANATE, DEP's Statewide Health Standard tables print 2.1 μg/L for residential groundwater in a used aquifer with TDS up to 2500, 19 mg/kg for residential soil direct contact from 0 to 15 feet, and two residential soil to groundwater values for a used aquifer with TDS up to 2500: 0.21 mg/kg as 100 X GW MSC and 0.029 mg/kg as the generic value.
- 2.1μg/L R Table 1: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Groundwater Used Aquifers, TDS ≤ 2500
- 19mg/kg 0-15 feet Table 3a: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: A. Direct Contact Numeric Values Residential
- 0.21mg/kg 100 X GW MSC Table 3b: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: B. Soil to Groundwater Numeric Values Used Aquifers, TDS ≤ 2500, Residential
- 0.029mg/kg Generic Value Table 3b: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: B. Soil to Groundwater Numeric Values Used Aquifers, TDS ≤ 2500, Residential
These are the Pennsylvania Department of Environmental Protection's published values for METHYL ISOCYANATE, from its Statewide Health Standard tables. DEP's page says the tables present the standards published November 20, 2021. Each value is shown as the agency prints it, with the same number written out beside it where that reads differently.
Pennsylvania: Statewide Health Standard Medium-Specific Concentrations
Table 1: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Groundwater
DEP's file dated April 14, 2022.
| Column | Value | Code |
|---|---|---|
| R (μg/L) | 2.1 | N |
| NR (μg/L) | 8.8 | N |
| Column | Value | Code |
|---|---|---|
| R (μg/L) | 210 | N |
| NR (μg/L) | 880 | N |
| Column | Value | Code |
|---|---|---|
| R (μg/L) | 2.1 | N |
| NR (μg/L) | 8.8 | N |
Footnotes to Table 1, as the agency prints them
All concentrations in μg/L
H = Lifetime health advisory level
R = Residential
G = Ingestion
NR = Non-Residential
N = Inhalation
M = Maximum Contaminant Level
S = Aqueous solubility cap
THMs – The values listed for trihalomethanes (THMs) are the total for all THMs combined.
HAAs – The values listed for haloacetic acids (HAAs) are the total for all HAAs combined.
PFOA and PFOS values listed are for individual or total combined
Table 3a: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: A. Direct Contact Numeric Values
DEP's file dated January 4, 2022.
| Column | Value | Code |
|---|---|---|
| 0-15 feet (mg/kg) | 19 | N |
| Column | Value | Code |
|---|---|---|
| Surface Soil, 0-2 feet (mg/kg) | 79 | N |
| Subsurface Soil, 2-15 feet (mg/kg) | 91 | N |
Footnotes to Table 3a, as the agency prints them
All concentrations in mg/kg
G - Ingestion
N - Inhalation
C - Cap
Table 3b: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: B. Soil to Groundwater Numeric Values1
DEP's file dated January 19, 2022.
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 0.21 | |
| Generic Value (mg/kg) | 0.029 | E |
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 0.88 | |
| Generic Value (mg/kg) | 0.12 | E |
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 21 | |
| Generic Value (mg/kg) | 2.9 | E |
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 88 | |
| Generic Value (mg/kg) | 12 | E |
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 0.21 | |
| Generic Value (mg/kg) | 0.029 | E |
| Column | Value | Code |
|---|---|---|
| 100 X GW MSC (mg/kg) | 0.88 | |
| Generic Value (mg/kg) | 0.12 | E |
| Column | Value |
|---|---|
| Soil Buffer Distance (feet) | NA |
Footnotes to Table 3b, as the agency prints them
1 For other options see Section 250.308
E - Number calculated by the soil to groundwater equation in Section 250.308
All concentrations in mg/kg
C - Cap
NA - The soil buffer distance option is not available for this substance
The agency's current table governs. This page is a reference copy and not a cleanup decision. Check the agency's page for a newer table before relying on a value.
Source
- Pennsylvania Department of Environmental Protection, Statewide Health Standard Medium-Specific Concentrations.
- Table 1: DEP's file dated April 14, 2022, read October 5, 2026.
- Table 3a: DEP's file dated January 4, 2022, read October 5, 2026.
- Table 3b: DEP's file dated January 19, 2022, read October 5, 2026.