You picked the house.What should you know?

Whether the address sits in a Special Flood Hazard Area, where federally backed mortgages typically require flood insurance.

Your county's predicted average indoor radon level. Some areas warrant testing or radon-resistant construction by default.

Active and archived priority environmental cleanup sites within three miles of the address.

Modelled risk that wildfire would reach a structure on this lot — based on terrain, fuels, and historical burn data.

Magnitude-3+ earthquakes recorded within 50 miles over the past decade. A simple seismicity check, not a full hazard model.

Federally declared severe storms, tornadoes, ice storms, and inland floods that affected this county in the past 10 years.

Federally declared hurricanes and tropical storms affecting this county over the past 30 years — the buyer's window into how often the coast gets hit.

Health-based violations recorded against the community water system serving this area in the past 5 years.

Current air quality index near the property, including the worst pollutant from the closest monitoring station.

Exact ground elevation above sea level — useful context for flood, surge, and climate.

Current weekly drought classification at this location, from abnormally dry to exceptional drought.

Distance to the nearest tracked volcano. Most addresses are far enough away that this reads green; some Pacific and Cascade addresses are not.

Whether the address falls within modelled coastal inundation scenarios at 1, 3, 6, and 10 feet above today's high tide.

Whether the address is in a coastal state with documented tsunami hazard zones.

Soil drainage class and historical flooding frequency for the lot — affects basements, septic, and yard standing water.

Median effective property-tax rate for the state — often the largest hidden cost a buyer underestimates.

Coldest expected winter low for the area, expressed as a USDA zone — a quick read on how harsh winters are.

Estimated annual energy production from a typical 4 kW rooftop system — useful for buyers thinking about energy costs.

Distance to the closest hospital. A practical concern for older buyers, families, and rural addresses.

Distance to the nearest operating commercial reactor — relevant if the address is inside a 10- or 50-mile planning zone.

Whether the state is in the high-incidence cluster for Lyme disease — relevant for outdoor activity and pets.

Median home value, household income, owner-occupancy, age, and education for the census tract — sets the register of the block.

Average one-way commute for workers in this tract — the question relocators wish they'd asked sooner.

Distance to the closest school and how many are within five miles — practical for families.

Distance to the nearest large or medium hub airport — a fair proxy for overhead flight noise.

Public EV charging stations within ten miles of the address, including DC fast-charge ports.

Quick read on whether the USDA Rural Development loan program (zero down, income-limited) likely applies in this state.

Active industrial facilities reporting chemical releases in this ZIP — complements the historical hazardous-sites check.

State-level 30-year averages: snowfall, hot days, sunny days. A quick read for relocators.

State-average annual premium. The cost most buyers underestimate — it varies five-fold across the country.

Average hours per year customers in this state lose electric power, including major weather events.

Distance to the nearest motorway, trunk route, or primary highway — a fair proxy for traffic noise at the property.

Distance to the nearest park, nature reserve, or recreation area — quality-of-life signal for outdoor access.

Active facilities in this ZIP licensed to handle hazardous waste. Distinct from historic Superfund cleanup sites.

Distance to the nearest mapped dam — relevant for downstream-flooding context if a dam fails or releases unexpectedly.

Distance to the nearest active mainline railroad — train horns and freight rumble are real noise concerns.

Mapped mines, quarries, and historical mineshafts within five miles. Subsidence and mine drainage are real concerns in coal country.

Distance to the nearest mapped electrical generation facility, with extra weight on coal and gas plants for emissions.

Distance to the nearest fire station or ambulance station — a fair proxy for response times during medical or fire emergencies.

Watches, warnings, and advisories currently in effect at this location — a real-time read on what the weather is actually doing today.

ISPs and technologies serving this address according to the FCC National Broadband Map — fiber, cable, DSL, fixed wireless, or none.

A synthesized score across highway, railroad, and airport noise sources — so you don't have to triangulate three separate cards.

Climate-driven moisture pressure based on 30-year precipitation normals and regional humidity — a major factor in indoor air quality.

Likelihood of a private septic system vs. municipal sewer, based on county-level Census data. Septic inspection and pumping history matter before purchase.

Statistical estimate of whether the property is likely subject to a homeowners association, based on neighborhood age, density, and value.

Historical days above 90°F and projected future heat exposure — increasingly relevant for outdoor living, energy costs, and vulnerable residents.

Tornado touchdowns and significant (EF2+) events in this county over the past 30 years. Tornado Alley and Dixie Alley have very different profiles.

USGS landslide hazard classification for this area — relevant for hillside lots, homes near cliffs, or coastal bluff properties.

Whether the address is in a state with documented sinkhole activity — primarily Florida, with pockets in Texas, Missouri, and Pennsylvania.

Estimated violent and property crime rates for the local area, compared against national averages.

Proximity to daily destinations — shops, transit, parks, restaurants. Indicates how much daily life at this address depends on a car.

Distance to the nearest grocery store — a daily-errand indicator of how car-dependent life at this address will feel.

Whether the county is a federally designated Health Professional Shortage Area for primary care or mental health services.

CDC-tracked chronic health outcomes for the county — rates of heart disease, diabetes, poor mental health days, and preventive care access.

Risk of lead in the drinking water supply based on infrastructure age and utility data. A priority check for homes with young children.

Long-term cancer and respiratory risk from chronic ambient air toxics at the census-tract level, based on EPA's National Air Toxics Assessment.

Full-year EPA air quality history for the county — good days, unhealthy days, and peak AQI — revealing seasonal patterns invisible in daily readings.

Measured sky brightness at the address — a rough indicator of how rural or suburban the surroundings feel after dark.

Whether the immediate area contains mapped wetlands. Can affect buildability, drainage, and permitting for any expansion or outbuilding.

Former industrial or commercially contaminated sites nearby that are candidates for cleanup — distinct from active Superfund cleanup sites.

Natural gas and hazardous liquid pipelines within a half-mile. A low-probability but high-severity proximity risk worth knowing about.

Distance to high-voltage transmission lines — a real property-value and aesthetic concern for many buyers.

Active oil and gas wells within a few miles. In energy-producing states, relevant for noise, odor, and potential groundwater concerns.

EPA-tracked coal ash storage sites within 25 miles — a potential groundwater and environmental contamination concern near power plants.

FEMA major disaster declarations for this county over the past 30 years — a historical lens on how often federal assistance has been triggered here.

USDA rural-urban classification — metro core, suburb, exurb, small town, or truly rural. Shapes hospital access, broadband, and daily life.

Recent median home price trends for the county — context for whether the local market is appreciating, flat, or cooling.

Distance to the nearest local or regional airport. Smaller airports often mean more frequent low-altitude overflights than major hubs.

Proximity to the nearest college or university — a quality-of-life signal and a driver of the local rental market and neighborhood demographics.

Large data centers within five miles — an emerging source of noise, power demand, and water use in suburban corridors.

FCC-reported mobile carrier coverage at the address — which carriers provide 4G LTE or 5G, and whether there are dead zone concerns.

Total NFIP flood insurance claims filed in this county since 2004 — a real-world measure of how often flooding actually happens here.

State average residential electricity rate compared to the national average — a hidden carrying cost that varies five-fold across the country.

Distance to the nearest military installation. Close proximity can mean aircraft noise and restricted airspace; it also ties local economy to the base.

The school district this address falls within, from Census boundary data. District boundaries determine which public schools serve the property.

Number of mapped bus stops and transit stations within one mile. A direct signal for car-free livability and walkable daily life.

Distance to the nearest mapped industrial landuse zone — factories, warehouses, and processing facilities that can bring truck traffic, odor, and noise.

Proximity to cropland, orchards, and vineyards. At close range, pesticide drift, machinery noise, and seasonal dust are realistic concerns.

Utility-scale wind turbines within three miles. At close range, turbine noise (~45 dB), shadow flicker, and visual impact are well-documented nuisances.

Distance to the nearest mapped shooting range. Outdoor ranges can produce persistent gunfire noise, especially on weekends and holidays.

Distance to the nearest mapped prison or correctional facility. Proximity is public information buyers often factor into neighborhood assessments.

Whether the water utility serving this address has PFAS violations on record with the EPA. PFAS ('forever chemicals') have MCLs effective April 2024.

Whether the property is within a USACE-mapped levee-protected area, and whether that levee is FEMA-accredited to the 1% annual chance flood standard.

USACE hazard classification for dams within 10 miles. High Hazard means a dam failure would likely result in loss of life downstream.

CDC Social Vulnerability Index for the census tract — composite measure of housing, transportation, poverty, and minority status factors that affect a community's resilience to disasters.

Whether the community participates in FEMA's Community Rating System, which can reduce NFIP flood insurance premiums by up to 45% for policyholders.

Federally declared winter storms and blizzards that affected this county in the past 20 years — context for how severe winters actually get in this area.

Active and closed landfills and solid waste facilities within five miles — a proximity concern for odor, leachate, and long-term property values.

Restaurants and cafes within walking distance (800m) — a lifestyle signal for how much daily life at this address depends on a car.

Coffee shops within walking distance — a quick quality-of-life read for walkable daily routines.

Gyms and fitness centers within 1.5km — a lifestyle check for buyers who factor workout convenience into their decision.

Veterinary clinics within 5km — a practical access check for pet owners moving to a new area.

Movie theaters within 10 miles — a regional entertainment access indicator that matters more in rural and suburban markets.

Public pools within 5 miles — recreational access for families and fitness swimmers.

Ice skating rinks within 12 miles — a regional recreational amenity relevant for families and winter sports enthusiasts.

Dedicated off-leash dog parks within 3 miles — a key quality-of-life check for dog owners.

Public libraries within 5 miles — a community resource check for families, students, and remote workers.

Pharmacies within 3 miles — a practical healthcare access indicator for prescription pickups and everyday needs.

Urgent care clinics and medical offices within 10 miles — important for non-emergency care without a long hospital drive.

Daycare centers and childcare facilities within 5 miles — a priority check for families with young children moving to a new area.

Dental offices within 10 miles — practical access indicator for routine cleanings and emergency dental care.

Bars and pubs within 1.2 miles — a walkable nightlife indicator for buyers who factor social access into their decision.

Museums and cultural institutions within 25 miles — a regional quality-of-life indicator for arts and culture access.

Churches, temples, mosques, and other places of worship within 5 miles — community access indicator for religious and cultural life.

Banks and financial institutions within 3 miles — a practical daily-errand indicator for in-person banking access.

Gas stations within 5 miles — a convenience check that stands out for rural and exurban addresses where the nearest pump matters.

County-level unemployment rate from BLS Local Area Unemployment Statistics — a snapshot of local economic health that affects property values and services.

Residential vacancy rate from HUD USPS data — high vacancy can signal disinvestment or population decline in the surrounding area.

HUD Fair Market Rent for this county — the government benchmark for what a modest rental unit should cost, useful context for investment or renting decisions.