County · IA
Johnson County (IA), IA
ZIP-level federated summaries inside Johnson County (IA), Iowa. zipradar pulls property tax (county assessor), deeds (county recorder), water quality (EPA SDWIS), flood zones (FEMA NFHL), schools (NCES CCD), and crime (FBI UCR) at the county and ZIP level.
Last verified 2026-04-26 · methodology
1 ZIP code live in Johnson County (IA)
Browse Johnson County (IA) by topic
EPA SDWIS
Water quality
FEMA NFHL
Flood zone
USDA Forest Service
Wildfire risk
EPA AirNow
Air quality
FBI UCR
Crime
NCES Common Core of Data
Schools
EPA Radon Zones
Radon
EPA LCRR + RTI National Lead Pipe Map
Lead pipes
County assessors
Property tax
County recorders
Deed activity
Municipal planning departments
Zoning
NSOPW (federal deep-link)
Sex offender registry
Iowa top concern
Radon Zone 1, agricultural water nitrates
Iowa is one of the highest-radon states in the US — uniformly Zone 1. Agricultural runoff drives EPA SDWIS nitrate violations in small rural systems and even Des Moines Water Works. Tornadoes peak April-June.
See Iowa state page for the full state-level rollup, plus all Iowa counties.
Read more on county-level data
How property tax, deeds, zoning, and schools work at the county level — the office distinctions, what data lags, and what each record actually means.
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.
Property tax millage — what 'mill' means and how your bill is computed
Plain-English guide to property tax millage rates, assessment ratios, and homestead exemptions. How county assessors compute your annual property tax bill.
School district boundaries — how to confirm yours and why it matters
How school district boundaries work, where to find them, and why the same street can split between two districts.
Deed records — what they show and what they don't
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).
Zoning codes — what R-1, C-2, M-1, MU mean and why your house is one
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.