ASTI Environmental
Grand Rapids, MI
Listed for: Testing
Reports NRSB certification (not yet verified by Radon411)
Call ASTI Environmental at (317) 573-6594No website listed
Locations and reports
Radon in Grand Rapids, Michigan
EPA puts Kent County, where Grand Rapids is, in Zone 2, its middle radon zone, and 16.5% of its 8,449 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
16.5%
10.4 pts below MI
- Kent
- 16.5%
- Michigan
- 26.9%
Kent, 43rd of 82 in MI, 2008 to 2017
Median result
1.8pCi/L
Below action level
- Kent
- 1.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Kent's tests, 2008 to 2017
Nearest county
16.8%
Ottawa, 17 miles
- Ottawa
- 16.8%
- Kent
- 16.5%
2,546 tests, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
Kent, where Grand Rapids is
Tests reported
8,449
In Kent
- Kent
- 8,449
- Ottawa
- 2,546
Reported to CDC before any fix, 2008 to 2017
Read a result for Grand Rapids
Starts at Kent County's median, 1.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.8 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Kent County's median reported result, 2008 to 2017.
The data
Grand Rapids, What is published
What is published for Grand Rapids
Information:
Every figure for Grand Rapids is a county's
Radon data is published by county, not by city, so for Grand Rapids it is Kent County's: its EPA zone (Zone 2) and the 8,449 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.
Grand Rapids covers 44.8 square miles of land, all of it in Kent County. About 201,183 people live there, 4,493 to the square mile.
Grand Rapids, Counties
The county Grand Rapids lies in
MeasuredKent County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.
Kent CountyZone 2Moderate predicted potential
- 16.5%
- Reported tests at or above 4 pCi/L
- 1.8 pCi/L
- Median reported result
- 8,449 tests
- Tests reported to CDC
- None
- Yearly figures on file
Kent County ranks 43rd of 82 Michigan counties with 30 or more tests for that period, 10.4 points below the 26.9% pooled across Michigan's counties, 19.2 points below the national pool of 35.7%.
The counties nearest Grand Rapids with a CDC figure for 2008 to 2017, laboratory, measured from the middle of the city: Ottawa County (17 miles, 16.8% of 2,546 tests), Allegan County (28 miles, 18.4% of 766 tests) and Ionia County (30 miles, 36.8% of 1,391 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 3.2% to 36.8%; the farthest of them, Eaton County, is 49 miles away at 34.4%.
The directory lists 2 businesses with an address in Grand Rapids, 2 for testing. Michigan's other cities with a page of their own: Ann Arbor and Lansing.
The counties around Grand Rapids
By distance from the middle of Grand Rapids; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Grand Rapids, Geology
The ground under Grand Rapids
PredictedUSGS's geologic map splits Grand Rapids: 55.6% of its land is moderate radon potential and 44.4% low. The map puts 55.6% of Grand Rapids in the area it calls South-Central Michigan Basin and 44.4% in Lake Michigan Lobe Deposits. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| South-Central Michigan Basin | Sandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites. | Moderate | 10 | 55.6% |
| Lake Michigan Lobe Deposits | Sandy to clayey glacial deposits and some glacial lake deposits. | Low | 8 | 44.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Grand Rapids beside its county and Michigan
Kent County as a whole has more moderate-potential ground than Grand Rapids: 76.4% of the county against 55.6% of the city. Across Michigan 9.6% of the land is rated high; none of Grand Rapids' is.
The map rates the ground, not the air in any home.
Grand Rapids, Homes
Homes in Grand Rapids
Of Grand Rapids' 85,145 homes, 57% are detached houses, against 65% across Kent County; 22% are in buildings of five or more homes. The homes are older than Kent County's as a whole: half were built before 1953 (1976 for Kent County), and 60% date from before 1960. 55% of occupied homes are lived in by their owner (Kent County: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Grand Rapids | Kent County | Michigan |
|---|---|---|---|
| Housing units | 85,145 | 267,071 | 4,599,683 |
| Detached houses | 57% | 65% | 72% |
| In buildings of 5 or more | 22% | 17% | 13% |
| Mobile homes | under 1% | 4% | 5% |
| Built before 1960 | 60% | 33% | 36% |
| Built since 2000 | 11% | 21% | 15% |
| Middle year built | 1953 | 1976 | 1972 |
| Owner-occupied | 55% | 70% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Grand Rapids, Professionals
Radon professionals listed in Grand Rapids
Businesses whose listed city is Grand Rapids, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Grand Rapids: 1 of 2
2 listings with Grand Rapids as the city. See radon testing in Grand Rapids, or all radon professionals in Michigan.
Grand Rapids, Local resources
Local resources for Grand Rapids
Who to ask in Michigan: its radon program, test kits and professionals.
- Michigan Indoor Radon ProgramRun by Michigan Department of Environment, Great Lakes, and Energy, phone 800-723-6642.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Michigan2 listings cover Grand Rapids.
The program's own words on licensing are on the Michigan page.
What it means
Grand Rapids, Questions
Questions about radon in Grand Rapids
What radon zone is Grand Rapids in?
Grand Rapids takes its zone from Kent County, which EPA puts in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.
What are radon levels in Grand Rapids?
Kent County's 8,449 tests for 2008 to 2017 (laboratory totals) put 16.5% at or above 4 pCi/L: most tests near Grand Rapids come back under EPA's action level, but not all. The median reported result was 1.8 pCi/L.
Should I test my home in Grand Rapids?
Yes. Roughly one reported test in 6 in Kent County reached 4 pCi/L. That is below Michigan's pooled 26.9%, and still not a reason to skip it, and ranks Kent County 43rd of the 82 Michigan counties with 30 or more tests. Only a test puts a number on one house. How to test a home.
What ground is Grand Rapids built on, as far as radon goes?
55.6% of Grand Rapids sits on what USGS's map calls "South-Central Michigan Basin", rated moderate for radon potential, radon index 10; another 44.4% is "Lake Michigan Lobe Deposits", rated low for radon potential, radon index 8. So the ground changes within Grand Rapids itself.
Is radon higher in the counties around Grand Rapids?
Some are and some are not. Against Kent County's 16.5%, 6 of the 8 nearest counties with a figure report more and 2 less, from Muskegon County (3.2%, 34 miles off) to Ionia County (36.8%, 30 miles off).
Who tests for or fixes radon in Grand Rapids?
Radon411's directory has 2 businesses with an address in Grand Rapids, all listed for testing, none for mitigation. Every entry names the public list it was taken from. Radon professionals in Grand Rapids.
The answers use the published figures of Kent County, the county Grand Rapids lies in.
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