Compare · DC · CA
ZIP 20001 vs ZIP 94102
Washington, DC compared to San Francisco, CA on twelve public-records dimensions. Data landing this week as ingestion rolls out.
Last verified 2026-04-24 · methodology
Side by side
| Dimension | ZIP 20001 | ZIP 94102 |
|---|---|---|
| Water quality EPA SDWIS | Data landing this week | Data landing this week |
| Flood zone FEMA NFHL | Data landing this week | Data landing this week |
| Wildfire risk USDA Forest Service | Data landing this week | Data landing this week |
| Air quality EPA AirNow | Data landing this week | Data landing this week |
| Crime FBI UCR | Data landing this week | Data landing this week |
| Schools NCES Common Core | Data landing this week | Data landing this week |
| Radon EPA Radon Zones | Data landing this week | Data landing this week |
| Lead pipes EPA LCRR / RTI | Data landing this week | Data landing this week |
| Property tax County assessor | Data landing this week | Data landing this week |
| Deed activity County recorder | Data landing this week | Data landing this week |
| Zoning Municipal planning | Data landing this week | Data landing this week |
| Sex offender registry NSOPW (deep-link) | Data landing this week | Data landing this week |
Dimensions populate live as ingestion reaches each source. Every row will link to the primary regulator.
District of Columbia context
Lead service lines (DC Water), flood
DC Water has documented elevated lead service line replacement obligations under LCRR. The Anacostia + Potomac waterfronts have FEMA AE zones; FBI UCR jurisdictional reporting for DC differs from state UCR aggregations.
California context
Wildfire (WUI), seismic, water-supply variability
California carries the highest concentrated WUI wildfire risk in the US per USFS WHP, with FAIR Plan + non-renewal pressure intensifying since 2017 fires. FEMA NFHL coverage is strong; drinking-water systems vary from large urban (LADWP, EBMUD) to small disadvantaged community systems flagged in EPA SDWIS. Radon risk is mostly Zone 2-3.
Read more on cross-ZIP comparisons
Editorial deep-dives that help when reading two places side-by-side — what each data layer actually proves, and what it doesn't.
Flood zones explained — what AE, X, and VE actually mean
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.
EPA Radon Zones — what 1, 2, and 3 mean and when you should test
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.
FBI UCR and NIBRS — what crime statistics actually show (and don't)
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.
Lead and Copper Rule 2024 — the federal lead-pipe inventory mandate
The 2024 Lead and Copper Rule Revisions (LCRR) require every US community water system to inventory and report lead service lines. Plain-English guide.
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