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Guardian REIS/Imperial Inspection Services

Norwalk, Iowa. Testing

2 Iowa state licenses verified against the Iowa Department of Health and Human Services, Bureau of Radiological Health list, last checked November 3, 2026.

Call Guardian REIS/Imperial Inspection Services at (515) 218-5674Visit website of Guardian REIS/Imperial Inspection Services (opens in a new tab)

Credentials

Licenses and certifications

2 credentials are on file for this business, each exactly as the issuer's list printed it.

Iowa state licenses (2)

Issued by the Iowa Department of Health and Human Services, Bureau of Radiological Health, not by NRPP or NRSB. Radon411 last checked the list on November 3, 2026. No expiry date is on the record.

LicenseNumberStatus on the listVerifiedCheck with the issuer
Testing licenseNo. RNTST09161Certified Radon Measurement SpecialistVerified November 3, 2026Verify RNTST09161 with the Iowa Department of Health and Human Services, Bureau of Radiological Health (opens in a new tab)
Testing licenseNo. RNTST09181Certified Radon Measurement SpecialistVerified November 3, 2026Verify RNTST09181 with the Iowa Department of Health and Human Services, Bureau of Radiological Health (opens in a new tab)

Licensing in Iowa

Iowa's radon program says the state licenses or certifies radon professionals.

Iowa HHS Radon Program, Iowa Department of Health and Human Services, (515) 281-4928.

What Iowa requires, in its program’s own words, and how to check a credential

Local radon figures

Radon in Norwalk

Norwalk lies partly in Polk County, where 64.4% of 10,945 radon tests reported to CDC (2008 to 2017, laboratory) were at or above 4 pCi/L, 5.9 points above Iowa pooled (58.5%), 51st of 99 Iowa counties with 30 or more tests.

Radon test figures for the counties Norwalk lies in
CountyTestsAt or above 4 pCi/LMedianIowa, pooledRank in the stateEPA zone
Polk County10,94564.4%5.6 pCi/L58.5%51 of 99Zone 1
Warren County1,51366.0%6.3 pCi/L58.5%48 of 99Zone 1

Shares of tests people chose to run and report, by county (2008 to 2017, laboratory); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.

The counties around Norwalk

Around Polk County, one of the counties Norwalk lies in, the nearest Iowa counties with a CDC figure for 2008 to 2017, laboratory run from 58.5% to 73.3% of tests at or above 4 pCi/L; the closest, Dallas County, is 24 miles away at 58.5%.

The nearest Iowa counties to Polk County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Dallas County24 mi2,35258.5%4.9 pCi/L
Story County25 mi2,56859.9%5.0 pCi/L
Jasper County27 mi74673.3%8.2 pCi/L
Boone County30 mi1,13468.7%6.0 pCi/L
Madison County34 mi31862.3%6.0 pCi/L
Marion County35 mi1,15167.3%6.0 pCi/L

Nearby

Radon professionals nearest Norwalk

More radon professionals in NorwalkMore radon professionals in Iowa

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