CDC Environmental Health Programs and Initiatives

The Centers for Disease Control and Prevention operates a set of environmental health programs that address the relationship between physical, chemical, and biological exposures in the environment and human disease outcomes. These programs span air and water quality, toxic substance exposure, climate-related health risks, and community-level hazard surveillance. Understanding how CDC structures this work — and where its authority begins and ends — is essential for public health practitioners, state agencies, and policy researchers.

Definition and scope

CDC's environmental health programs are housed primarily within the National Center for Environmental Health (NCEH) and its linked entity, the Agency for Toxic Substances and Disease Registry (ATSDR). NCEH was established to protect Americans from environmental hazards through science-based programs, surveillance, and applied research. ATSDR, created under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) of 1980, carries a distinct statutory mandate to assess public health risks at hazardous waste sites and chemical release locations across the United States.

The combined scope of these two bodies covers:

NCEH and ATSDR together maintain the National Environmental Public Health Tracking Network, which links data from 26 states and New York City to monitor connections between environmental hazards and health outcomes such as asthma, cancer, and cardiovascular disease.

This environmental health work operates alongside — but is functionally distinct from — CDC's occupational safety and health programs, which focus on workplace-specific exposures rather than community and ambient environmental conditions.

How it works

CDC's environmental health programs operate through four primary mechanisms: surveillance and data systems, direct technical assistance, grant funding to state and local health departments, and the development of health guidance.

Surveillance and biomonitoring form the foundation. The National Biomonitoring Program, run by NCEH, measures the presence of environmental chemicals — including pesticides, heavy metals, and flame retardants — in blood and urine samples from participants in the National Health and Nutrition Examination Survey (NHANES). As of the most recent published cycle, NHANES measures more than 300 environmental chemicals and chemical metabolites in biological samples, providing nationally representative exposure data.

Site assessment is a core ATSDR function. When communities are exposed to hazardous substances from Superfund sites, industrial accidents, or contaminated water systems, ATSDR conducts Public Health Assessments that determine whether exposures pose a public health hazard. These assessments are required by CERCLA statute for all sites on the National Priorities List (NPL), which the EPA maintains.

Minimal Risk Levels (MRLs) are a key technical product. ATSDR publishes MRLs for hazardous substances — estimates of daily human exposure that are unlikely to cause non-cancer health effects. These values are used by state health agencies, emergency responders, and environmental regulators as reference points when evaluating exposure scenarios.

Grant and cooperative agreement funding flows to state environmental health programs through mechanisms described in detail on the CDC grants and cooperative agreements page. The Tracking Program, for example, funds state health departments to collect and publish local environmental and health data through standardized portals.

Common scenarios

1. Lead exposure investigation: A state health department identifies a cluster of children with elevated blood lead levels in a specific zip code. NCEH provides technical support for environmental sampling, exposure source identification, and remediation guidance. CDC's Childhood Lead Poisoning Prevention Program (CLPPP) has tracked the decline of the blood lead reference value from 10 micrograms per deciliter (µg/dL) to 3.5 µg/dL (CDC CLPPP reference value update, 2021), and supports state programs in identifying children who exceed that threshold.

2. Hazardous waste site exposure: Residents near a National Priorities List site report health complaints. ATSDR conducts a Public Health Assessment, reviews exposure pathways (groundwater, soil, air), compares measured contaminant concentrations against MRLs, and issues a determination of whether a public health hazard exists. ATSDR maintains Toxicological Profiles for more than 275 hazardous substances that guide these assessments (ATSDR Toxicological Profiles).

3. Extreme heat event response: A region experiences a multi-day heat event. NCEH's Climate and Health Program coordinates with local health departments to activate heat emergency surveillance, track emergency department visits for heat-related illness, and issue guidance aligned with CDC's Heat and Health resources.

4. Aquatic facility health standards: CDC's Model Aquatic Health Code (MAHC) provides a voluntary framework that state and local jurisdictions use to regulate public swimming pools and spas, targeting infectious disease risks from inadequate disinfection and filtration.

Decision boundaries

CDC's environmental health authority is advisory and technical rather than regulatory. EPA holds primary federal regulatory power over environmental contamination under statutes including CERCLA, the Clean Air Act, and the Safe Drinking Water Act. CDC and ATSDR do not issue enforceable cleanup orders or set legally binding ambient environmental standards.

The boundary between ATSDR and NCEH functions is defined by statute: ATSDR's mandate is site-specific and tied to CERCLA and RCRA (Resource Conservation and Recovery Act) triggers, while NCEH's mandate is broader, covering surveillance, chronic disease prevention related to environmental exposures, and public health preparedness. A community near a CERCLA site receives ATSDR assessment; a community with elevated asthma rates linked to regional air quality receives NCEH tracking and program support.

CDC's environmental health programs also have a defined boundary with clinical care. These programs identify population-level risks and support public health responses — they do not provide individual medical diagnosis or treatment. Clinicians seeking exposure guidance consult ATSDR's clinical guidelines, but treatment decisions remain outside CDC's operational scope.

The relationship between these programs and CDC's broader mandate is summarized on the CDC mission and vision page. For an overview of how environmental health fits within the full range of CDC program areas, the CDC centers, institutes, and offices page provides the organizational context. A full picture of CDC's scope — including environmental, infectious disease, and chronic disease domains — is available at the site index.