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  "name": "zipradar — editorial library (machine-readable index)",
  "description": "52 plain-English explainers of the public-records data zipradar federates. LearningResource + Article schema on each.",
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    "name": "zipradar",
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      "position": 1,
      "url": "https://zipradar.org/learn/flood-zones-explained/",
      "name": "Flood zones explained — what AE, X, and VE actually mean",
      "description": "Plain-English guide to FEMA flood-zone codes (A, AE, AH, V, VE, X, X-shaded). What the 1% and 0.2% annual-chance zones mean for your property and your insurance.",
      "relatedTopics": [
        "flood-zone",
        "water-quality",
        "wildfire-risk"
      ]
    },
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      "position": 2,
      "url": "https://zipradar.org/learn/radon-zones-and-when-to-test/",
      "name": "EPA Radon Zones — what 1, 2, and 3 mean and when you should test",
      "description": "EPA classifies every US county into Zone 1 (high), Zone 2 (moderate), or Zone 3 (low) for radon. Plain-English guide to the classifications and at-home testing.",
      "relatedTopics": [
        "radon",
        "water-quality",
        "lead-pipes"
      ]
    },
    {
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      "position": 3,
      "url": "https://zipradar.org/learn/fbi-ucr-vs-nibrs-what-the-numbers-mean/",
      "name": "FBI UCR and NIBRS — what crime statistics actually show (and don't)",
      "description": "The FBI's Uniform Crime Reporting (UCR) program and its successor NIBRS aggregate crime data from local agencies. Plain-English guide to what gets reported, what doesn't, and how to read the numbers.",
      "relatedTopics": [
        "crime",
        "schools",
        "deed-activity"
      ]
    },
    {
      "@type": "ListItem",
      "position": 4,
      "url": "https://zipradar.org/learn/lead-and-copper-rule-2024-changes/",
      "name": "Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate",
      "description": "The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.",
      "relatedTopics": [
        "lead-pipes",
        "water-quality",
        "property-tax"
      ]
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      "position": 5,
      "url": "https://zipradar.org/learn/property-tax-millage-explained/",
      "name": "Property tax millage — what 'mill' means and how your bill is computed",
      "description": "Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.",
      "relatedTopics": [
        "property-tax",
        "deed-activity",
        "zoning"
      ]
    },
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      "position": 6,
      "url": "https://zipradar.org/learn/aqi-and-when-to-stay-indoors/",
      "name": "AQI explained — what 50, 100, 150 actually mean for your lungs",
      "description": "Plain-English guide to the EPA Air Quality Index (AQI) and the 6 categories from Good to Hazardous. When to take precautions and which pollutants matter.",
      "relatedTopics": [
        "air-quality",
        "wildfire-risk",
        "water-quality"
      ]
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      "position": 7,
      "url": "https://zipradar.org/learn/school-district-boundaries-and-how-to-look-them-up/",
      "name": "School district boundaries — how to confirm yours and why it matters",
      "description": "How school district boundaries work, where to find them, and why the same street can split between two districts.",
      "relatedTopics": [
        "schools",
        "deed-activity",
        "property-tax"
      ]
    },
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      "position": 8,
      "url": "https://zipradar.org/learn/wildfire-hazard-potential-and-home-defense/",
      "name": "Wildfire Hazard Potential — what the USFS scale means and how to defend your home",
      "description": "Plain-English guide to the USDA Forest Service's Wildfire Hazard Potential 1–5 scale, how to read your community's risk, and concrete home-defense measures.",
      "relatedTopics": [
        "wildfire-risk",
        "flood-zone",
        "air-quality"
      ]
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      "url": "https://zipradar.org/learn/epa-sdwis-and-how-to-read-water-violations/",
      "name": "EPA SDWIS — how to read drinking-water violations and what they actually mean",
      "description": "Plain-English guide to EPA SDWIS drinking-water violations: health-based vs. monitoring vs. reporting violations, MCLs, and what triggers a public notice.",
      "relatedTopics": [
        "water-quality",
        "lead-pipes",
        "radon"
      ]
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      "position": 10,
      "url": "https://zipradar.org/learn/deed-records-explained/",
      "name": "Deed records — what they show and what they don't",
      "description": "Plain-English guide to county deed records: what gets filed, how to look up a property's history, and why zipradar aggregates only counts (never owner names).",
      "relatedTopics": [
        "deed-activity",
        "property-tax",
        "zoning"
      ]
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      "url": "https://zipradar.org/learn/zoning-codes-r1-c2-m1-explained/",
      "name": "Zoning codes — what R-1, C-2, M-1, MU mean and why your house is one",
      "description": "Plain-English guide to common US zoning codes: R-1 / R-2 / C-1 / C-2 / M-1 / MU. Why zoning matters for your home, your neighbors, and what you can build.",
      "relatedTopics": [
        "zoning",
        "property-tax",
        "deed-activity"
      ]
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      "position": 12,
      "url": "https://zipradar.org/learn/homestead-exemption-state-by-state/",
      "name": "Homestead exemption — state-by-state property tax savings",
      "description": "Every US state offers a homestead exemption that reduces property tax for owner-occupied homes. State-by-state amounts and how to file.",
      "relatedTopics": [
        "property-tax",
        "deed-activity",
        "zoning"
      ]
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      "url": "https://zipradar.org/learn/fbi-ucr-national-crime-trends/",
      "name": "Reading FBI UCR national crime trends — what 2020–2025 actually shows",
      "description": "Plain-English guide to recent US crime data: the 2020 spike, the 2021–2024 normalization, and how the UCR-to-NIBRS transition complicates year-over-year reads.",
      "relatedTopics": [
        "crime",
        "schools",
        "deed-activity"
      ]
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      "url": "https://zipradar.org/learn/epa-airnow-aqi-and-wildfire-smoke/",
      "name": "AirNow + wildfire smoke — when AQI is a real-time tool",
      "description": "How EPA AirNow handles real-time wildfire smoke, what the colors mean during fire season, and where AirNow leaves gaps you should know about.",
      "relatedTopics": [
        "air-quality",
        "wildfire-risk",
        "water-quality"
      ]
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      "position": 15,
      "url": "https://zipradar.org/learn/epa-radon-zones-and-real-estate/",
      "name": "Radon and real estate — what disclosure laws and home tests actually require",
      "description": "What home sellers must disclose about radon by state, when home tests are required, and how to interpret radon-mitigation systems if a home you're buying has one.",
      "relatedTopics": [
        "radon",
        "water-quality",
        "lead-pipes"
      ]
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      "position": 16,
      "url": "https://zipradar.org/learn/wildfire-insurance-and-affordability-2026/",
      "name": "Wildfire insurance in 2026 — why premiums spiked and what to do",
      "description": "California, Oregon, Colorado, and other Western states have seen wildfire insurance premiums double or homeowners drop entirely. Plain-English guide to the 2026 market.",
      "relatedTopics": [
        "wildfire-risk",
        "flood-zone",
        "property-tax"
      ]
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      "position": 17,
      "url": "https://zipradar.org/learn/nces-school-data-and-district-boundaries/",
      "name": "NCES Common Core of Data — what district boundaries actually mean for buyers",
      "description": "How NCES district boundaries, school ratings, and student-teacher ratios feed real-estate decisions — and what the data does NOT tell you.",
      "relatedTopics": [
        "schools",
        "property-tax",
        "zoning"
      ]
    },
    {
      "@type": "ListItem",
      "position": 18,
      "url": "https://zipradar.org/learn/epa-sdwis-violations-explained/",
      "name": "EPA SDWIS — reading drinking-water violations without panicking",
      "description": "EPA's drinking-water database flags violations across every public water system. Here's how to read what's in your ZIP — and what 'violation' actually means.",
      "relatedTopics": [
        "water-quality",
        "lead-pipes"
      ]
    },
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      "@type": "ListItem",
      "position": 19,
      "url": "https://zipradar.org/learn/fema-nfhl-flood-zones-AE-vs-X-vs-VE/",
      "name": "FEMA flood zones — AE vs. X vs. VE in plain English",
      "description": "FEMA's National Flood Hazard Layer maps every US property's flood-zone designation. Here's what AE, X, VE, and AO actually mean for your insurance bill.",
      "relatedTopics": [
        "flood-zone",
        "wildfire-risk",
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 20,
      "url": "https://zipradar.org/learn/county-assessor-property-tax-101/",
      "name": "County assessor data — how millage rates and assessments actually combine",
      "description": "Property tax = assessment × millage rate, but the math has caveats. Here's how zipradar pulls + normalizes county assessor data across the top 50 metros.",
      "relatedTopics": [
        "property-tax",
        "zoning",
        "deed-activity"
      ]
    },
    {
      "@type": "ListItem",
      "position": 21,
      "url": "https://zipradar.org/learn/nsopw-deep-link-only-why/",
      "name": "NSOPW — why zipradar deep-links instead of caching the registry",
      "description": "The National Sex Offender Public Website is structured for deep-links. Here's why caching is forbidden and how zipradar surfaces the data legally.",
      "relatedTopics": [
        "sex-offender-registry"
      ]
    },
    {
      "@type": "ListItem",
      "position": 22,
      "url": "https://zipradar.org/learn/fema-loma-letter-of-map-amendment/",
      "name": "FEMA LOMA — when your home is wrongly in a flood zone (and how to appeal)",
      "description": "Letters of Map Amendment let homeowners appeal a wrong FEMA flood-zone designation. Here's the cost, timeline, and success rate.",
      "relatedTopics": [
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 23,
      "url": "https://zipradar.org/learn/nces-sabs-school-attendance-boundaries/",
      "name": "NCES SABS — the only authoritative US school attendance map",
      "description": "NCES SABS is the federal school-attendance-boundary survey. Here's what it covers, what it misses, and how zipradar uses it for ZIP-to-school mapping.",
      "relatedTopics": [
        "schools"
      ]
    },
    {
      "@type": "ListItem",
      "position": 24,
      "url": "https://zipradar.org/learn/deed-activity-zip-rollups-explained/",
      "name": "Deed activity by ZIP — what aggregated transfers tell you about market trends",
      "description": "County recorders log every deed transfer. Aggregated to ZIP-level counts, the data reveals turnover, foreclosure pressure, and market temperature — without exposing PII.",
      "relatedTopics": [
        "deed-activity",
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 25,
      "url": "https://zipradar.org/learn/buying-a-house-12-dimension-checklist/",
      "name": "Buying a house — the 12-dimension data checklist before you sign",
      "description": "Twelve federated public-records dimensions every US homebuyer should check before closing. Synthesized from EPA, FEMA, FBI, NCES, county assessors + recorders.",
      "relatedTopics": [
        "water-quality",
        "flood-zone",
        "wildfire-risk",
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 26,
      "url": "https://zipradar.org/learn/private-well-water-when-sdwis-doesnt-cover/",
      "name": "Private well water — what to test when EPA SDWIS doesn't cover you",
      "description": "EPA SDWIS only covers public water systems. Private wells (~13% of US homes) are the homeowner's responsibility. Here's what to test, how often, and what each test costs.",
      "relatedTopics": [
        "water-quality",
        "lead-pipes"
      ]
    },
    {
      "@type": "ListItem",
      "position": 27,
      "url": "https://zipradar.org/learn/county-recorder-vs-county-assessor-difference/",
      "name": "County recorder vs. county assessor — they sound the same, they're not",
      "description": "The recorder publishes deeds and mortgages. The assessor publishes valuations and tax bills. Different offices, different data, different mistakes — here's how to read both.",
      "relatedTopics": [
        "deed-activity",
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 28,
      "url": "https://zipradar.org/learn/zoning-special-overlays-historic-flood-environmental/",
      "name": "Zoning overlays — historic, flood, environmental layers that change what you can build",
      "description": "Base zoning codes (R-1, C-2, M-1) are only half the story. Special overlays — historic districts, floodplain, conservation, scenic — add a second rule layer. Here's what each one does.",
      "relatedTopics": [
        "zoning",
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 29,
      "url": "https://zipradar.org/learn/pfas-forever-chemicals-and-drinking-water/",
      "name": "PFAS in drinking water — what 2024's new MCLs actually mean",
      "description": "EPA finalized first-ever drinking-water MCLs for PFAS in April 2024. Here's what's covered, the 5-year compliance timeline, and how to read your utility's testing.",
      "relatedTopics": [
        "water-quality",
        "lead-pipes"
      ]
    },
    {
      "@type": "ListItem",
      "position": 30,
      "url": "https://zipradar.org/learn/lead-in-paint-vs-lead-in-pipes/",
      "name": "Lead in paint vs. lead in pipes — same metal, different exposure",
      "description": "Lead service lines (LCRR) and lead-based paint (Title X) are governed by separate regulatory regimes. Here's how each one matters when buying an older home.",
      "relatedTopics": [
        "lead-pipes",
        "water-quality"
      ]
    },
    {
      "@type": "ListItem",
      "position": 31,
      "url": "https://zipradar.org/learn/epa-superfund-and-brownfields-near-your-home/",
      "name": "EPA Superfund + Brownfields — what 'contaminated site nearby' actually means",
      "description": "EPA's National Priorities List (Superfund) flags the most contaminated sites in the US. Brownfields tracks lower-tier abandoned-industrial sites. Here's how to read both.",
      "relatedTopics": [
        "water-quality",
        "zoning"
      ]
    },
    {
      "@type": "ListItem",
      "position": 32,
      "url": "https://zipradar.org/learn/property-tax-escrow-when-you-buy/",
      "name": "Property tax escrow — why your monthly payment changes after you close",
      "description": "When you buy a home, your monthly mortgage payment includes a property-tax escrow estimate based on the prior owner's bill. Here's why it almost always changes — usually upward.",
      "relatedTopics": [
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 33,
      "url": "https://zipradar.org/learn/aqi-thresholds-sensitive-groups/",
      "name": "AQI thresholds — what 'unhealthy for sensitive groups' actually means for you",
      "description": "EPA's AQI uses six bands keyed to specific population groups. Here's what each band means at the personal-decision level — go outside, mask, stay home.",
      "relatedTopics": [
        "air-quality"
      ]
    },
    {
      "@type": "ListItem",
      "position": 34,
      "url": "https://zipradar.org/learn/hoa-deed-restrictions-vs-zoning/",
      "name": "HOA + deed restrictions vs. zoning — three regimes that govern what you can do",
      "description": "Zoning, HOA covenants (CC&Rs), and deed restrictions are three separate regimes. Each one can override the others on different things. Here's how to read all three.",
      "relatedTopics": [
        "zoning"
      ]
    },
    {
      "@type": "ListItem",
      "position": 35,
      "url": "https://zipradar.org/learn/data-staleness-when-to-retest/",
      "name": "Data staleness — when to re-check zipradar before making a decision",
      "description": "Federal data refreshes on different cadences. Here's when zipradar's snapshot is fresh enough for your decision and when you need to verify with the primary source.",
      "relatedTopics": [
        "water-quality",
        "flood-zone",
        "schools",
        "crime"
      ]
    },
    {
      "@type": "ListItem",
      "position": 36,
      "url": "https://zipradar.org/learn/epa-airnow-particulate-vs-ozone/",
      "name": "EPA AirNow — when to watch for particulates vs. ozone",
      "description": "AirNow's composite AQI hides which pollutant is dominant. PM2.5 and ozone behave differently — knowing which one is driving today's reading changes your response.",
      "relatedTopics": [
        "air-quality",
        "wildfire-risk"
      ]
    },
    {
      "@type": "ListItem",
      "position": 37,
      "url": "https://zipradar.org/learn/usgs-earthquake-hazard-and-insurance/",
      "name": "USGS earthquake hazard maps — when separate earthquake insurance is worth it",
      "description": "USGS publishes a public earthquake-hazard map for every US county. Standard homeowners doesn't cover earthquake damage. Here's how to read the map + when to add coverage.",
      "relatedTopics": [
        "wildfire-risk",
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 38,
      "url": "https://zipradar.org/learn/septic-systems-private-well-coupling/",
      "name": "Septic systems — what they fail on, what tests cost, when they're a deal-breaker",
      "description": "About 21% of US homes use a septic system. They fail in patterns. Here's the inspection cost, common failures, and when a failed septic is reason to walk from a deal.",
      "relatedTopics": [
        "water-quality",
        "lead-pipes"
      ]
    },
    {
      "@type": "ListItem",
      "position": 39,
      "url": "https://zipradar.org/learn/title-insurance-explained/",
      "name": "Title insurance — what it actually covers, why it's a one-time premium, and why you can't skip it",
      "description": "Title insurance protects against ownership claims that surface after closing. One-time premium ($1,000-3,000). Lender's vs owner's policy. Here's the reality.",
      "relatedTopics": [
        "deed-activity",
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 40,
      "url": "https://zipradar.org/learn/closing-day-realistic-checklist/",
      "name": "Closing day — what actually happens + the documents you'll sign",
      "description": "First-time buyer closing-day reality. The 30+ documents, the wire-fraud risk, the final walk-through, and what to bring. 1-3 hours typical.",
      "relatedTopics": [
        "property-tax",
        "deed-activity"
      ]
    },
    {
      "@type": "ListItem",
      "position": 41,
      "url": "https://zipradar.org/learn/radon-real-estate-disclosure-by-state/",
      "name": "Radon disclosure during real-estate transactions — state-by-state",
      "description": "Whether sellers must disclose known radon results varies by state. Quick map of mandatory-disclosure states + what to ask for during inspection.",
      "relatedTopics": [
        "radon"
      ]
    },
    {
      "@type": "ListItem",
      "position": 42,
      "url": "https://zipradar.org/learn/mello-roos-and-special-tax-districts/",
      "name": "Mello-Roos + special tax districts — the property-tax extras you didn't see",
      "description": "Mello-Roos (CA), CDDs (FL), MUDs (TX), PIDs — special-district taxes that add to your tax bill on top of the millage rate. How to find them before you buy.",
      "relatedTopics": [
        "property-tax"
      ]
    },
    {
      "@type": "ListItem",
      "position": 43,
      "url": "https://zipradar.org/learn/groundwater-vs-municipal-water-which-do-you-have/",
      "name": "Groundwater vs municipal water — which does your address have, and how to tell",
      "description": "About 13% of US households are on private wells. Here's how to tell which water source serves your address — and what each means for testing, cost, and quality.",
      "relatedTopics": [
        "water-quality"
      ]
    },
    {
      "@type": "ListItem",
      "position": 44,
      "url": "https://zipradar.org/learn/wildfire-defensible-space-zone-0-1-2/",
      "name": "Defensible space zones 0/1/2 — California's 100-foot rule + what works in practice",
      "description": "Defensible-space rules around your home (Zone 0: 0-5ft ember-resistant, Zone 1: 5-30ft lean+green, Zone 2: 30-100ft reduced fuel). Required in CA + Western states.",
      "relatedTopics": [
        "wildfire-risk"
      ]
    },
    {
      "@type": "ListItem",
      "position": 45,
      "url": "https://zipradar.org/learn/fema-bfe-base-flood-elevation-explained/",
      "name": "Base Flood Elevation (BFE) — the number that decides flood insurance",
      "description": "What FEMA Base Flood Elevation means, how it's measured, why an elevation certificate matters, and how 1 foot of difference can swing your annual flood premium $1,500+.",
      "relatedTopics": [
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 46,
      "url": "https://zipradar.org/learn/tornado-alley-and-wind-zones/",
      "name": "Tornado risk by region — wind zones, safe rooms, and roof rating",
      "description": "How FEMA wind-zone maps work, where Tornado Alley actually sits in 2026, ICC-500 safe-room standards, and which roof rating cuts insurance the most.",
      "relatedTopics": [
        "wildfire-risk",
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 47,
      "url": "https://zipradar.org/learn/hurricane-evacuation-zones-and-storm-surge/",
      "name": "Hurricane evacuation zones and storm-surge maps — what the colors mean",
      "description": "Plain-English guide to hurricane evacuation zones (A, B, C, D, E + non-evac), how storm-surge maps differ from FEMA flood zones, and what your evac zone means for insurance.",
      "relatedTopics": [
        "flood-zone"
      ]
    },
    {
      "@type": "ListItem",
      "position": 48,
      "url": "https://zipradar.org/learn/drought-water-rights-and-private-wells/",
      "name": "Drought, water rights, and private wells — when your tap runs dry",
      "description": "How drought levels affect well users in the West, water-rights doctrine (riparian vs. prior-appropriation), and what to verify before buying a property on private well in a drought-prone state.",
      "relatedTopics": [
        "water-quality"
      ]
    },
    {
      "@type": "ListItem",
      "position": 49,
      "url": "https://zipradar.org/learn/fcc-broadband-data-and-rural-connectivity/",
      "name": "FCC broadband data — checking real internet speed before you buy",
      "description": "How the FCC's National Broadband Map works, why ISP advertised speeds lie, and the 5 free tools to verify actual broadband options at any US address before closing.",
      "relatedTopics": []
    },
    {
      "@type": "ListItem",
      "position": 50,
      "url": "https://zipradar.org/learn/ev-charging-coverage-and-home-installation/",
      "name": "EV charging access by ZIP — DOE AFDC data + home Level-2 install",
      "description": "How to check public EV charger density per ZIP via DOE Alternative Fuels Data Center, what Level-1/2/3 actually means, and what a home Level-2 install costs in 2026.",
      "relatedTopics": []
    },
    {
      "@type": "ListItem",
      "position": 51,
      "url": "https://zipradar.org/learn/walk-bike-transit-scores-explained/",
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      "description": "Plain-English breakdown of Walk Score's algorithm, what 70/100 actually means at street level, and the free tools that complement it for biking + transit.",
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      "name": "Noise pollution maps — airports, highways, freight rail by address",
      "description": "How DOT's National Transportation Noise Map works, FAA Noise Exposure Maps for airports, what 65 dB DNL means for resale, and the 4 tools to verify quietness pre-purchase.",
      "relatedTopics": []
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}