What the records mean, and what to ask next
Each guide covers one kind of record: why it may matter, how it could actually reach a home, what no map can tell you, and the specific questions for the regulator, seller, inspector or utility. Reviewed 2026-09-13.
Massachusetts sex offender registry
Official searches, public-record coverage, and historical city totals. A missing count is not zero.
Incinerators & waste-to-energy
Combustion can release particulate matter, nitrogen oxides, acid gases, metals and dioxins/furans. Fine particles can affect the lungs and cardiovascular system; other effects depend on the pollutant and dose. Actual emi…
Superfund (National Priorities List) sites
An NPL listing means EPA documented hazardous-substance contamination serious enough for a federally led investigation and cleanup. The contaminants, the media affected (soil, groundwater, indoor air, surface water) and …
Landfills & land-disposal sites
Landfill gas, odors and leachate are potential concerns. Methane is flammable when it accumulates; the relevance of other gases or groundwater contamination depends on site conditions and exposure. Closed sites may still…
Hazardous-waste facilities (RCRA)
Treatment, storage and disposal facilities handle hazardous waste under permit; a facility currently flagged as a significant non-complier has unresolved serious violations. Ordinary generators such as hospitals or works…
Cleanup sites & historic contamination
Depending on the chemicals and conditions, concerns can involve contact with contaminated soil, drinking water or vapors entering buildings. A classification or cleanup record does not mean a nearby home is contaminated.
Industrial releases & air-program facilities
The chemical, release route and concentration matter more than a facility count or a total number of pounds. Air releases may contribute to exposure downwind; water releases need a water-pathway assessment. Reporting doe…
PFAS in drinking water
PFAS are persistent chemicals linked in studies to effects on cholesterol, immune response, birth weight and some cancers at sustained exposure. EPA set limits of 4.0 ng/L for PFOA and PFOS in 2024 (compliance deadlines …
Drinking water & groundwater
The water serving a home may come from far away. A nearby industrial site alone does not establish contamination in tap water. Service-area boundaries are estimates and do not verify a household connection.
Flood context
Flooding can damage buildings and utilities and create moisture, mold and access problems. FEMA map zones describe mapped flood hazards; they do not predict every flood or guarantee a property will stay dry.
Radon inside the home
Radon is a radioactive gas that can accumulate indoors and increase lung-cancer risk. Nearby facility records and regional maps cannot determine a home’s radon level. Testing is the way to find out.
Major roads & traffic
Traffic can contribute to air pollution and noise. Near-road exposure has been associated with respiratory and cardiovascular effects. Road distance does not establish the concentration inside a home.
Transportation & everyday noise
Noise can affect comfort and sleep. The BTS transportation-noise model is a regional planning tool, not a measurement of sound at this home. It omits some sources and does not account for all shielding.
Transmission lines
Check easements, access, visual impact and possible audible noise. Power-frequency magnetic fields are different from cell-tower radiofrequency fields. Some studies associate higher residential magnetic-field exposure wi…
Communications towers & antennas
Mapped structures can support cellular, broadcast or other uses. Radiofrequency energy is non-ionizing; a nearby tower does not by itself establish harmful exposure or cancer risk. Equipment, antenna orientation and acce…
Cameras, plate readers & privacy
Plate readers may create searchable vehicle-location records. Privacy implications depend on what is collected, retention, access, sharing and oversight. A community camera point does not prove it records the selected ho…
Transfer stations & other waste facilities
Truck movements, noise, dust and odors can matter to daily life. A transfer station handles waste and is different from a landfill or an incinerator. Health relevance requires evidence about actual pollutants and exposur…