EPA Risk Assessment

EPA’s risk assessment process is described here and here.

Chart: Steps for Evaluating Risks

EPA’s graphic above shows the risk assessment process-from Prioritization to Risk Management.

In December 2016, EPA published the first 10 chemical substances to undergo TSCA risk evaluations. As of June 2020, draft risk evaluations have been released for all 10. The first 10 chemicals are:

  • 1,4-Dioxane
  • 1-Bromopropane
  • Asbestos
  • Carbon Tetrachloride
  • Cyclic Aliphatic Bromide Cluster (HBCD)
  • Methylene Chloride
  • N-methylpyrrolidone (NMP)
  • Pigment Violet 29
  • Perchloroethylene (PERC)
  • Trichloroethylene (TCE)

In December 2019, EPA also designated 20 other chemical substances as high-priority and another 20 as low- priority. The 20 high-priority chemicals will enter the risk assessment process and the ones designated as low priority will not (more information on Prioritization here). The 20 high priority chemical substances are:

  • 1,3-Butadiene
  • o-Dichlorobenzene
  • p-Dichlorobenzene
  • 1,1-Dichloroethane
  • 1,2-Dichloroethane
  • Trans-1,2-Dichloroethylene
  • 1,2-Dichloropropane
  • Ethylene dibromide
  • HHCB
  • TPP
  • 1,1,2-Trichloroethane
  • TCEP
  • Diethylhexyl Phthalate (DEHP)
  • Dicyclohexyl Phthalate
  • Diisobutyl Phthalate (DiBP)
  • Butyl Benzyl Phthalate (BBP)
  • Dibutyl Phthalate (DBP)
  • Phthalic Anhydride
  • Formaldehyde

In April 2020, EPA published the draft scopes of the next 20 chemical substances to undergo risk evaluations under TSCA. The draft scopes can be found here. Information on the components of risk evaluations and the timelines can be found here.

During the risk assessment process, EPA provides opportunities for public comment. Draft risk evaluations of the first 10 chemicals had a 60-day comment period. A 90-day comment period was provided on the high and low priority designations for the next 20 chemicals and a 45-day period was provided on the 20 draft scopes. You can find more information on how to submit comments to EPA dockets here and you can learn how to access EPA dockets here.

More information on the first 30 chemicals undergoing risk evaluations under TSCA and where in the risk assessment process they are, including access to draft scopes, draft risk evaluations, and EPA dockets, can be found here.

Action Now
Take action now on toxics
NTTC Membership
View contact information for NTTC
Past Action
View past action on toxics by NTTC