Methyl mercury cleanup levels by state

CAS 22967-92-6
2 states

CAS 22967-92-6 is in the cleanup-level tables of 2 states in this handbook: Florida (Methylmercury [or Mercury, methyl]) and Texas (Methyl mercury). Each state's numbers are below as its agency prints them. The states run different programs and do not define their values the same way, so a number from one is not the same measure as a number from another. A state that lists the substance under another CAS number, or without one, is not shown here.

Florida

FL DEP
Chapter 62-777 CTLs
February 2005

For Methylmercury [or Mercury, methyl], DEP's cleanup target level tables print 0.07** ug/L as the groundwater criterion, 1.1 mg/kg for residential direct exposure to soil and 0.002 mg/kg for soil leachability based on groundwater.

0.07**ug/L Groundwater Criteria Table I: Groundwater and Surface Water Cleanup Target Levels
1.1mg/kg Direct Exposure - Residential Table II: Soil Cleanup Target Levels
0.002mg/kg Leachability Based on Groundwater Table II: Soil Cleanup Target Levels

Florida Department of Environmental Protection

** = Groundwater CTLs for class C carcinogens with no cancer slope factor were developed using the reference dose divided by a factor of 10, as described in the February 2005 'Final Technical Report: Development of Cleanup Target Levels (CTLs) for Chapter 62-777, F.A.C.'

All Florida values for Methylmercury [or Mercury, methyl]

Texas

TCEQ
TRRP Tier 1 PCLs
February 6, 2025

For Methyl mercury, TCEQ's Tier 1 table prints 8 mg/kg for TotSoilComb and no value for GWSoilIng (residential soil, 0.5 acre source area), and 0.0024 mg/L for GWGWIng (residential groundwater).

8mg/kg 8.0E+00 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
─ GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
0.0024mg/L 2.4E-03 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential

All Texas values for Methyl mercury

Each agency's own publication governs: its current table, or the published rule where the agency says so. This page is a reference copy and not a cleanup decision. Check each agency's page before relying on a value.

Source

Florida Department of Environmental Protection, Cleanup Target Levels for Chapter 62-777, F.A.C., dated February 2005. Files read October 6, 2026.
Texas Commission on Environmental Quality, Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. File read October 1, 2026.