THIRAM cleanup levels in Pennsylvania

These are the Pennsylvania Department of Environmental Protection's published values for THIRAM, 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.

Used Aquifers, TDS ≤ 2500

Column	Value	Written out	Code
R (μg/L)	520		G
NR (μg/L)	1500	1,500	G

Used Aquifers, TDS > 2500

Column	Value	Written out	Code
R (μg/L)	30000	30,000	S
NR (μg/L)	30000	30,000	S

Nonuse Aquifers

Column	Value	Written out	Code
R (μg/L)	520		G
NR (μg/L)	1500	1,500	G

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.

Residential

Column	Value	Written out	Code
0-15 feet (mg/kg)	3300	3,300	G

Non-Residential

Column	Value	Written out	Code
Surface Soil, 0-2 feet (mg/kg)	48000	48,000	G
Subsurface Soil, 2-15 feet (mg/kg)	190000	190,000	C

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.

Used Aquifers, TDS ≤ 2500, Residential

Column	Value	Code
100 X GW MSC (mg/kg)	52
Generic Value (mg/kg)	140	E

Used Aquifers, TDS ≤ 2500, Nonresidential

Column	Value	Code
100 X GW MSC (mg/kg)	150
Generic Value (mg/kg)	390	E

Used Aquifers, TDS > 2500, Residential

Column	Value	Written out	Code
100 X GW MSC (mg/kg)	3000	3,000
Generic Value (mg/kg)	7800	7,800	E

Used Aquifers, TDS > 2500, Nonresidential

Column	Value	Written out	Code
100 X GW MSC (mg/kg)	3000	3,000
Generic Value (mg/kg)	7800	7,800	E

Nonuse Aquifers, Residential

Column	Value	Code
100 X GW MSC (mg/kg)	52
Generic Value (mg/kg)	140	E

Nonuse Aquifers, Nonresidential

Column	Value	Code
100 X GW MSC (mg/kg)	150
Generic Value (mg/kg)	390	E

Soil Buffer Distance (feet)

Column	Value
Soil Buffer Distance (feet)	20

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.