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Regional moisture & foundation analysis.
Explore aggregated findings from our ongoing neighborhood basement health study. Filter by region, time period, or issue type. All views are county- or ZIP-level aggregates.
- PRE-1980 HOMES
2.4x
more likely to report moisture issues
- POST-DROUGHT SHIFT
67%
see new moisture within 18 months
- UNTREATED BASEMENTS
78%
show progressive deterioration signs
Aggregated research data — does not represent any individual property or homeowner.
| Region / ZIP | Homes Studied | Moisture % | Top Issue | Home Era Mode | Trend |
|---|---|---|---|---|---|
|
Franklin County, OH |
1,240 |
38% |
Wall seepage |
1960-1980 |
↑ |
|
46628 (South Bend) |
890 |
42% |
Floor cracks |
Pre-1960 |
↑↑ |
|
Hamilton County, OH |
1,680 |
29% |
Humidity |
1980-2000 |
→ |
|
44107 (Lakewood) |
560 |
51% |
Active water |
Pre-1960 |
↑ |
Minimum 10 responses per area required for display. Data represents aggregate statistical summaries only.
- Longitudinal Trends
Year-over-year movement.
Aggregated reporting deltas across the active study cohort. Confidence intervals available in the methodology appendix.
Average moisture prevalence — rolling 12-month, 2026
Sample data
Climate
Precipitation rebound
Counties exiting drought conditions saw a 21-point increase in moisture-issue reports within 18 months.
Housing stock
Aging foundations
Pre-1980 housing stock represents 41% of studied homes but 67% of high-prevalence reports.
Maintenance
Repeat reporting
Untreated reports recur in 78% of follow-ups; treated reports recur in 12%.
- Quarterly & Annual
Downloadable reports.
PDF reports include full methodology, confidence intervals, and aggregated data tables. CSV exports cover the same period at county / ZIP grain.
Climate
- Q1 — 2026
Q1 2026 Regional Findings
Six-state cohort. Drought-rebound effects, pre-1980 housing differential, and seasonal precipitation correlation.
- Q4 — 2025
Q4 2025 Winter Cohort
Cold-region freeze-thaw correlation, sump-pump survey results, and the 2025 annual aggregate.
- 2025 — ANNUAL
2025 Annual Methodology Review
Internal advisory-board review, anonymization audit, sample-frame coverage, and IRB-style ethics summary.
- Q3 — 2025
Q3 2025 Mid-Atlantic Focus
Three-state focus on Pennsylvania, Ohio, and Indiana. Includes dwelling-era cross-tabulation.
Researchers: Aggregated raw datasets with full schema documentation will be available under a non-commercial research license once the 2026 program reaches its first scheduled publication. Request notification →
- How we collect, anonymize & publish
Methodology in brief.
A condensed summary of the study protocol. The full methodology document is published quarterly and reviewed by the advisory board.
Sample frame
Phone-based voluntary surveys conducted across active study counties. Inclusion criteria require owner-occupied single-family or multi-family residences with a reported basement or below-grade space.
Consent
All participants provide explicit verbal consent at the start of each survey. Recordings are not retained; only abstracted, anonymized response codes are aggregated. Consent scripts are published in the quarterly methodology document.
Anonymization
Individual responses are stripped of all direct identifiers before aggregation. The minimum aggregation unit is county or ZIP code, with a floor of 10 responses per geographic unit before any value is publishable.
Aggregation thresholds
- Minimum 10 responses per displayed area
- No cross-tabulation cell smaller than 5
- Geographic granularity capped at ZIP code
- Time aggregation no narrower than monthly
Confidence intervals
Reported percentages include 95% confidence intervals in the downloadable PDF reports. Web visualizations show point estimates only, with confidence ranges available on hover in the Data Explorer.
Limitations
Phone-based surveys carry known coverage and response biases. The study deliberately does not claim representativeness of the full US housing stock; geographic coverage is documented in each report.