Living Near a Superfund Site: What Residents Need to Know

People living near Superfund sites face a specific set of information needs that the general public health system rarely addresses: they need to know what contaminants are in their environment, through what pathways those contaminants might reach them, and what — specifically — they can do to reduce their exposure while living in proximity to an active or recently remediated contaminated site.

The ATSDR exists partly to fill this need. The Agency for Toxic Substances and Disease Registry produces health consultations and public health assessments for Superfund sites and other contaminated sites, answering the specific questions: Are the contaminants at this site, at the concentrations present, likely to cause harm to people in the surrounding community? Through what exposure pathways? And what protective actions are appropriate?

ATSDR documents are freely available, site-specific, and written with community audiences in mind — they are among the most practically useful resources for people living near contaminated sites, and among the least well-known.

Understanding how contaminants at a Superfund site might reach residents requires understanding the concept of exposure pathways — the specific routes by which contamination moves from its source to a person.

The five primary exposure pathways at contaminated sites:

Groundwater ingestion If contamination has reached the groundwater aquifer and you use a private well drawing from that aquifer, you may be ingesting contaminated water. This is the most direct pathway at many sites and the one that private well users need to evaluate most urgently.

Soil contact and incidental ingestion Contaminated soil in yards, gardens, and play areas can be ingested through hand-to-mouth contact (particularly in children) and through dermal contact. This pathway is most significant when soil contamination extends to residential properties adjacent to a site.

Vapour intrusion Volatile organic compounds — particularly chlorinated solvents like TCE — can evaporate from contaminated groundwater and migrate upward through soil into building foundations, entering indoor air. Vapour intrusion can produce indoor air concentrations of volatile chemicals at levels that exceed outdoor concentrations by orders of magnitude, independent of any surface pathway.

Air emissions If site remediation activities or site conditions generate air emissions — from contaminated soil disturbance, from treatment systems, or from volatile surface contamination — nearby residents may inhale contaminants.

Surface water and sediment If contamination has reached surface water bodies, recreational contact (swimming, fishing, children playing) can be an exposure pathway.

The practical steps for protecting your family while living near a contaminated site depend on which exposure pathways have been identified as complete — meaning contamination has been demonstrated to reach people through that pathway.

For groundwater pathways: • If you use a private well and the site's groundwater plume may have reached your aquifer, test your well — or ask the EPA or state environmental agency whether they will provide free testing • If your water utility uses groundwater from a potentially affected aquifer, check your Consumer Confidence Report for any monitoring results

For vapour intrusion: • If vapour intrusion has been identified as a potential pathway at your site, the EPA or state may offer free indoor air testing • If not offered, sub-slab air sampling or indoor air testing for relevant volatile chemicals can be conducted by certified environmental consultants • If vapour intrusion is documented, the primary mitigation is a sub-slab depressurisation system — similar to radon mitigation — that draws vapours from below the foundation and exhausts them outdoors

For soil pathways: • If surface soil contamination extends to residential properties, avoid tracked-in soil and maintain ground cover (grass, mulch) in play areas • Remove shoes before entering the home • Regular damp mopping of floors reduces tracked-in soil ingestion by children • Raised bed gardening using clean soil prevents uptake of contaminants from in-ground soil into food crops

CERCLA provides specific rights to community members living near Superfund sites that go beyond standard public participation processes.

The right to information: • All documents in the site's administrative record — including the RI/FS, the ROD, EPA correspondence with responsible parties, and monitoring reports — are public documents available through the administrative record repository (typically at a local library or government office near the site) • FOIA requests can obtain additional documents not in the public administrative record

The right to comment: • The proposed plan and draft ROD are subject to mandatory public comment periods of at least 30 days before EPA makes a final remedy selection • EPA must respond in writing to all significant comments received during the public comment period • Community concerns documented during the public comment process are formally considered in the final ROD

The right to technical assistance: • Technical Assistance Grants of up to $50,000 are available to community groups to hire independent technical advisors; applying for a TAG significantly strengthens a community's capacity to engage meaningfully with the technical documents

The right to participate in long-term monitoring: • After cleanup, sites typically have long-term monitoring programmes that document whether cleanup goals are being maintained • Community members can attend five-year review meetings where EPA assesses whether the remedy remains protective and request that their concerns be addressed in the five-year review report

PollutionProfile's Historical Exposure Recorder documents your residential proximity to Superfund sites across your address history, providing the foundation for understanding which sites are relevant to your exposure profile and what health assessments exist for those specific sites.