EDF Health

Cumulative assessment better estimates the real-world risks chemicals pose on our health

NOTE: This is the second of a series about EPA’s prioritization of existing chemicals. 

What Happened? 

EPA just proposed to designate five chemicals, including the widely-known toxic chemical vinyl chloride, as high-priority chemicals – meaning they are toxic to human and/or environmental health.  If finalized, these chemicals will immediately undergo the risk evaluation process under the Toxic Substances Control Act (TSCA).  

When designating these chemicals as high priority and moving forward in assessing their health risks, EPA can – and should – consider exposures to multiple chemicals that can cause the same health harms. To demonstrate the importance of these cumulative exposures, we conducted analysis on co-exposures to these five chemicals and submitted this analysis to EPA for greater consideration of real-world risks faced by individuals exposed to these toxic chemicals.  

Why It Matters 

Communities near industrial facilities are often exposed to multiple chemicals that cause the same health effects. Evaluating the health risk of these chemicals individually, as currently done by EPA’s TSCA program, often underestimates the true risks communities face. Additionally, many of these fenceline communities experience a variety of non-chemical stressors that exacerbate health effects from chemical exposure, such as physiological stress from poverty and racial discrimination, limited access to healthcare, or health effects from climate stressors like flooding and heat. Failing to consider these cumulative stressors on health in chemical risk evaluations often underestimates the actual risks these chemicals can pose to human health.  

Our Take 

Our analysis of Toxics Release Inventory (TRI) data from 2016-2021 shows that many chemicals that cause the same health effects – such as cancer, central nervous system (neurological), cardiorespiratory, liver, kidney, and thyroid, and reproductive and developmental effects – are often released together from the same facilities. For example, chemicals that cause cardiorespiratory effects are released with at least one other chemical that causes these same effects 74% of the time.  

For the five chemicals that have just been proposed as high priority under TSCA, all are known or probable carcinogens with some causing other adverse health effects. Based on our analysis, there are a few notable co-releases that EPA should consider when assessing cumulative risk with other chemicals causing the same harms. For example, creosotes, which are also probable carcinogens that can cause liver, kidney, and thyroid effects, are released 11% of the time with acrylonitrile, 18% with aniline, 11% with vinyl chloride, and 11% with 4,4-methylene bis(2-chloroaniline). 

Screenshot - Heatmap of co-releases of carcinogenic chemicals that are part of the TSCA Workplan.

Heatmap of co-releases of carcinogenic chemicals that are part of the TSCA Workplan. Legend represents the percentage of facilities releasing both chemicals out of the facilities releasing at least one of the pair of chemicals. Stars represent the 15 chemicals that were considered as part of TSCA’s pre-prioritization.

To demonstrate that EPA should also consider non-chemical stressors such as climate and environmental justice in its TSCA prioritization and risk evaluations, we looked at the vulnerability of communities to climate and environmental justice factors in areas where certain chemicals are released using EDF’s Climate Vulnerability Index. On average, vinyl chloride is released into communities with higher vulnerability than other chemicals analyzed – up to 12% higher than the average for other carcinogenic chemicals.  

What’s Next? 

EPA is now accepting comments on their proposal to designate these five chemicals as high priority, and we plan to submit comments to support the high priority designation. If finalized, EPA will begin risk evaluations for these chemicals. We hope EPA will consider cumulative risk and environmental justice as it moves through this process.   

In our next post in this series, we will recommend ways EPA can improve its prioritization process by considering risks from transportation and distribution of chemicals. 

Also posted in Adverse health effects, Chemical exposure, Chemical regulation, Cumulative impact, Cumulative risk assessment, Environmental justice, Health policy, Public health, Regulation, Risk assessment, Risk evaluation, Rules/Regulations, TSCA, Vulnerable populations / Authors: / Comments are closed

Now’s the Time—How EPA can use TSCA to turn off the PFAS tap

Faucet with the word PFAS flowing out of it

In the face of mounting evidence about the dangers posed by per- and polyfluoroalkyl substances (PFAS), one thing is clear: EPA needs to take urgent action to turn off the tap of these “forever chemicals” that have long-term consequences for our health and the environment.

As we discussed in a previous blog, it is imperative that the Environmental Protection Agency (EPA) use the Toxic Substances Control Act (TSCA) to regulate PFAS chemicals comprehensively—both those newly entering the market and those that have been in circulation for decades.

Read More »

Also posted in Chemical exposure, Chemical regulation, Cumulative impact, Cumulative risk assessment, Drinking water, Emerging science, Health policy, PFAS, Public health, Regulation, Risk assessment, Risk evaluation, TSCA, Vulnerable populations, Worker safety / Tagged , , | Authors: / Read 2 Responses

The Case of the Missing PFAS

By Lauren Ellis, MPH, Research Analyst, Environmental Health and Samantha Liskow, Lead Counsel, Health

NOTE: In a recent blog post, EDF called for EPA to revoke PFAS approved through the agency’s “low volume exemption” (an LVE is an exemption from a full safety review for new chemicals produced in quantities less than ~10 tons) and to instead require all PFAS to undergo a full safety review under the Toxic Substances Control Act (TSCA). Last month, EDF and other groups, represented by Earthjustice, formally petitioned EPA to do just that.

What Happened: We recently discovered that EPA is withholding the names of over 100 PFAS chemicals approved as LVEs—claiming that releasing that information would reveal “confidential business information” (CBI).

Why It Matters: PFAS causes harm to both the environment and to human health—including reproductive, developmental, and cancer-related effects. Given growing concerns about the risks of PFAS, the public has the right to know if they are being exposed to PFAS, especially those approved through exemptions to EPA’s new chemical safety review process.

Our Take:

  • EPA should reveal the identities of the missing PFAS LVEs. If doing so would reveal CBI, EPA should work with PFAS manufacturers to craft a name that clearly communicates PFAS class membership.
  • EPA should require full safety review for all PFAS, including those previously approved through exemptions.

GO DEEPER… Read More »

Also posted in Industry influence, PFAS, Public health, Regulation / Tagged | Read 1 Response

Workers are people too; EPA should treat them that way

EPA’s proposed TSCA rule to limit risks from chrysotile asbestos uses a higher “acceptable” cancer risk for workers than the rest of the population

Maria Doa, Ph.D., Senior Director, Chemicals Policy

When it comes to drawing the line on cancer risks, should workers be treated differently than the general population? Of course not. Unfortunately, EPA’s recently proposed rule to manage risks from chrysotile asbestos does just that, using one level of acceptable risk for workers and another – more protective threshold – for everyone else.

EPA says it uses a range for determining acceptable cancer risks under the Toxic Substances Control Act (TSCA), the country’s main chemical safety law. The range spans a risk (or the chance that a person will develop cancer) of less than one in 10,000 to a risk of less than one in one million. EPA says this is consistent with the cancer benchmark used by the National Institute for Occupational Safety and Health (NIOSH).

However, EPA’s proposed TSCA rule for asbestos does not actually use a range and it is not supported by TSCA. EPA instead applies a risk level to workers 100 times less protective than for everyone else! Read More »

Also posted in Public health, Worker safety / Tagged , , , , | Comments are closed

The many ways the American Chemistry Council wants to turn back time on TSCA implementation – Part 2

Part 2 of a 2-part series: Unrestricted approvals of new chemicals, with low fees 

Maria Doa, Ph.D., Senior Director, Chemicals Policy

In its recently issued ‘State of TSCA’ report, the American Chemistry Council (ACC) tries to turn back the clock on how EPA assesses and mitigates the risks of toxic chemicals under the Toxic Substances Control Act (TSCA) and in the process leave workers, frontline communities and other vulnerable individuals at risk.  

In my previous blog, I looked at how ACC’s proposals would restrict the EPA’s ability to assess chemical risks and the science behind it. In this second and final part of our blog series looking at the chemical industry trade group’s report, I discuss ACC’s plan to dictate how EPA should assess the safety of new chemicals industry hopes to bring to the marketplace, as well as its effort to let industry avoid paying its fair share of the cost for EPA to evaluate chemical risks.  Read More »

Also posted in Health policy, Industry influence, Public health / Tagged , , , | Read 3 Responses

The many ways the American Chemistry Council wants to turn back time on TSCA implementation – Part 1

Part 1 of a 2-part series: Minimizing or ignoring chemical risks

Maria Doa, Ph.D., Senior Director, Chemicals Policy 

In its recently issued ‘State of TSCA’ report, the American Chemistry Council (ACC) tries to turn back the clock on how EPA assesses and mitigates the risks of toxic chemicals. The chemical industry group looks to return to the policies of the Trump years – a time rife with scientific integrity issues and wholesale disregard of risks – particularly those risks to frontline communities, workers and other vulnerable groups: the very groups the Toxic Substances Control Act (TSCA) calls out for special consideration.

This 2-part blog series looks at the six ways ACC hopes to turn back time on chemical safety and looks at the harms that would result if trade group’s self-serving ideas were to be adopted. Part 1 looks at the types of risks ACC wants EPA to exclude from its chemical risk evaluations, the workers and other groups whose health would be affected, as well as the trade group’s goal to have itself appointed as the arbitrator of EPA science. Part 2 looks at ACC’s efforts to dictate the process for assessing new chemicals and industry’s clear goal to avoid paying its fair share of the cost to evaluate the risks posed by some of the most dangerous chemicals already in the marketplace.  Read More »

Also posted in Health policy, Health science, Industry influence, Worker safety / Tagged , , | Comments are closed