Metolachlor cleanup levels by state
- CAS 51218-45-2
- 3 states
CAS 51218-45-2 is in the cleanup-level tables of 3 states in this handbook: Florida (Metolachlor), Pennsylvania (METOLACHLOR) and Texas (Metolachlor). 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 Metolachlor, DEP's cleanup target level tables print 110** ug/L as the groundwater criterion, 12,000 mg/kg for residential direct exposure to soil and 1.2 mg/kg for soil leachability based on groundwater.
- 110**ug/L Groundwater Criteria Table I: Groundwater and Surface Water Cleanup Target Levels
- 12,000mg/kg 12000 Direct Exposure - Residential Table II: Soil Cleanup Target Levels
- 1.2mg/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.'
Pennsylvania
- PA DEP
- Act 2 Statewide Health Standards
For METOLACHLOR, DEP's Statewide Health Standard tables print 700 μg/L for residential groundwater in a used aquifer with TDS up to 2500, 10,000 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: 70 mg/kg as 100 X GW MSC and 40 mg/kg as the generic value.
- 700μg/L R Table 1: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Groundwater Used Aquifers, TDS ≤ 2500
- 10,000mg/kg 10000 0-15 feet Table 3a: Medium-Specific Concentrations (MSCs) for Organic Regulated Substances in Soil: A. Direct Contact Numeric Values Residential
- 70mg/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
- 40mg/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
Texas
- TCEQ
- TRRP Tier 1 PCLs
- February 6, 2025
For Metolachlor, TCEQ's Tier 1 table prints 10,000 mg/kg for TotSoilComb and 110 mg/kg for GWSoilIng (residential soil, 0.5 acre source area), and 3.7 mg/L for GWGWIng (residential groundwater).
- 10,000mg/kg 1.0E+04 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 110mg/kg 1.1E+02 GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
- 3.7mg/L 3.7E+00 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential
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.
- 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.
- Texas Commission on Environmental Quality, Texas Risk Reduction Program Tier 1 Protective Concentration Levels, last revised February 6, 2025. File read October 1, 2026.