State of Home Safety 2026: Current Scoring Method
Data source: ZipCheckup Home Safety Score contract version 4.0.0 and source-bound EPA, radon, and annual AQI inputs
Updated August 6, 2026. ZipCheckup withdrew the earlier quantitative edition of this article during a full data-trust rebuild. Old rankings, totals, correlations, and cost estimates are not carried forward unless they can be reproduced from accepted source-bound evidence.
What this page answers now
The corrected 2026 methodology for ZipCheckup Home Safety Scores, with old national totals and rankings withdrawn.
The primary evidence family for this topic is ZipCheckup Home Safety Score contract version 4.0.0 and source-bound EPA, radon, and annual AQI inputs. Used within its published definitions, that evidence can calculate a score only when all four required inputs are present under the current contract.
What the data does not establish
The same records cannot treat 17 site verticals as 17 weighted score components or compare legacy national rankings with the current series. A nearby record is not automatically a property-level finding. A missing match is an unknown state, not a measured zero. Different geographic units must not be joined as if they described the same population.
A safer review sequence
- Identify the exact address, utility, facility, monitor, tract, or other unit that the source measures.
- Check the record date, reporting period, units, qualifiers, and coverage. “ND” means not detected at the stated reporting limit; it is not the numeric value zero.
- Keep source disagreement visible. If two official sources report different values, retain both with their dates instead of silently choosing one.
- Use the record as a screening lead, then open the four component records, review coverage and vintage, and treat unscored ZIPs as unavailable rather than zero.
- Do not treat a ZIP-level pattern as an inspection, diagnosis, legal determination, insurance decision, or guarantee.
The current Home Safety Score
The current series is model 4.0.0. It requires four inputs: drinking-water compliance from SDWIS and ECHO, with PFAS kept inside the drinking-water domain; radon; and annual AQI. Those inputs form three equally weighted domains. A ZIP is not scored when any required input is unavailable. The grade thresholds are A at 85, B at 70, C at 55, D at 40, and F below 40. The site's 17-vertical registry describes broader safety context and future candidates; it is not a set of 17 weighted score components.
Why the previous numbers were removed
The retired edition mixed older data releases, legacy Home Safety Score logic, and derived aggregates whose complete input trail could not be reproduced under the current standard. Replacing one old headline number with another would repeat the same error. This edition therefore keeps only claims that remain valid without those retired calculations.
Data status
This page is a revalidated methodology and interpretation guide, updated 2026-08-06. It is not a new national ranking. Any future quantitative edition must publish its source versions, as-of dates, measured denominators, treatment of missing data, exact calculation method, and a reproducible release identifier.
Frequently Asked Questions
What can state of home safety 2026: current scoring method establish?
It can calculate a score only when all four required inputs are present under the current contract. The conclusion is limited to the source, geography, period, units, and coverage shown with the record.
What does a missing record mean?
It means the source did not provide a matched measurement in the reviewed scope. It does not mean zero risk, no event, or a clean result.
How should I use this information for a home?
Use it as a screening lead: open the four component records, review coverage and vintage, and treat unscored ZIPs as unavailable rather than zero.