Azobenzene cleanup levels by state

CAS 103-33-3
2 states

CAS 103-33-3 is in the cleanup-level tables of 2 states in this handbook: Florida (Azobenzene) and Texas (Azobenzene). 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 Azobenzene, DEP's cleanup target level tables print 0.3 ug/L as the groundwater criterion, 7.9 mg/kg for residential direct exposure to soil and 0.03 mg/kg for soil leachability based on groundwater.

0.3ug/L Groundwater Criteria Table I: Groundwater and Surface Water Cleanup Target Levels
7.9mg/kg Direct Exposure - Residential Table II: Soil Cleanup Target Levels
0.03mg/kg Leachability Based on Groundwater Table II: Soil Cleanup Target Levels

All Florida values for Azobenzene

Texas

TCEQ
TRRP Tier 1 PCLs
February 6, 2025

For Azobenzene, TCEQ's Tier 1 table prints 37 mg/kg for TotSoilComb and 18 mg/kg for GWSoilIng (residential soil, 0.5 acre source area), and 0.0083 mg/L for GWGWIng (residential groundwater).

37mg/kg 3.7E+01 TotSoilComb Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
18mg/kg 1.8E+01 GWSoilIng Table 1: Tier 1 Residential Soil PCLs 0.5 acre source area
0.0083mg/L 8.3E-03 GWGWIng Table 3: Tier 1 Groundwater PCLs - Residential and Commercial/Industrial Residential

All Texas values for Azobenzene

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.