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Using GIS for Displaying Radon Data in Understandable and Informative Ways

By Margaret Henderson

Source: Presentation: "So You Want to Draw a Map - Considerations for GIS" by
Clark Eldredge of the Florida Department of Health at the 25th National Radon Training Conference held in September 2015.

Considerations for using GIS (Geographic Information System) in making maps about radon were presented by Clark Eldredge of the Florida Department of Health at the 25th National Radon Training Conference held in September 2015. The event is sponsored by CRCPD with financial assistance from EPA.

GIS, a computer based system, provides the means to use databases and locational details to relate information to positions on the earth’s surface.

Mr. Eldredge advised about the use of mapping tools and discussed the considerations, terms, definitions, technicalities of GIS and the type of maps that could be created. To tell the story you want to present, Mr. Eldridge suggests asking yourself:
• What do you want to know or say?

Webinar Presents Results of Colorado Study Using Community Based Social Marketing

By Margaret Henderson

“Improving Voluntary Residential Radon Mitigation: Fort Collins Behavioral Study,” a Colorado webinar on the Fort Collins program to encourage mitigation of high radon levels provides a discussion of the mitigation successes and the study methods. The presentation explains the study done using Community Based Social Marketing, a data driven approach to changing behavior. The Colorado Healthy Housing Coalition sponsored the webinar, which addressed the project that was funded by the Colorado Department of Public Health and the Environment and the City of Fort Collins.

The recorded webinar, conducted in October 2105, is available on-line at

Healthy Homes Education Project of Minnesota Child Care Providers Concludes with Success

By Margaret Henderson

Spanning a three-year period, the Minnesota Department of Health conducted a project that targeted in-home family child care providers. The project involved 653 child care providers that conducted healthy home assessments. The homes involved had an estimated 1,437 residents and 6,123 children cared for who benefited from this project.

Of the 653 providers, 509 tested for radon and of those, 468 had valid radon test results. Results ranging from less than 0.3 pCi/L to 39.1 pCi/L, had a median value of 3.9 pCi/L. Based on factors such as radon concentration, number of children in child care and household income, mitigation systems were installed in 40 homes. The Minnesota Department of Health reports that “all 40 homes were mitigated for radon with a mean post-mitigation concentration of 1.3 pCi/L, down from 11.3 pCi/L before mitigation.”

Minnesota’s New Videos in Four Languages Reach Multi-cultural Audiences

By Margaret Henderson

In Minnesota, nearly 80% of counties are rated high radon zones according to the Minnesota Department of Health. (High radon zones are considered to have the potential for indoor radon concentrations to exceed the EPA recommended action level of 4 pCi/L.)

California Publishes New Radon Potential Map of San Mateo County

By Margaret Henderson

The California Department of Public Health, in partnership with the California Geological Survey, is developing detailed radon potential maps for regions of the state. With the diverse geological features of the state, area mapping is an important way of communicating with the public about radon potentials in their geographic areas of the state. To date, the project has completed nine maps.

The most recently published map and report, covering the County of San Mateo is available on the website ftp://ftp.consrv.ca.gov/pub/dmg/pubs/sr/sr_226/SR226_SanMateo_Radon_Final_map.pdf. (See the accompany report which describes radon potential for geologic formations in San Mateo County at ftp://ftp.consrv.ca.gov/pub/dmg/pubs/sr/sr_226/SR226_San_Mateo_Radon_FINAL.pdf.)

Nebraska’s Public Policy and Approach to Protecting its Citizens from Indoor Radon Exposures

By Margaret Henderson

The public policy of the State of Nebraska in protecting public health and safety includes maximizing practicable protection of its citizens from radon or its decay products. The state’s Radiation Control Act establishes requirements for appropriate qualifications for persons who provide measurement and mitigation services.

The Nebraska Department of Health and Human Services Radon Program effort includes issuing licenses to radon measurement specialists, radon mitigation specialists, radon measurement businesses, or radon mitigation businesses. Fees for licensure and mitigation systems are collected and support the program’s activities, including inspections to determine that requirements are being met and undertaking disciplinary provisions if necessary.

Comprehensive rules, Title 180 NAC, Chapter 11, effective July 5, 2015, detail requirements. See

Virginia Radon Program Communicates with the Public Through a Variety of Ways

By Margaret Henderson

CRCPD Announces 2015 Radon Hero Award Recipient Larainne Koehler

By Margaret Henderson

At its 25th National Radon Training Conference held in September 2015, the Conference of Radiation Control Program Directors (CRCPD) announced the award recipient for the 2015 Radon Hero Award.

The award stated:

Nebraska Website Presents Radon Test Data and Guidance to Aid the Public

By Margaret Henderson

According to the Nebraska Department of Health and Human Services website, Nebraska has “a very high incidence of radon in homes; over half of radon tests in the state are above the (EPA) action level of 4.0 pCi/L.” The website provides maps and tables of radon test results in an effort to assist organizations to target their resources and to implement radon-resistant building codes. 

The data displayed is helpful to residents who would like to see what levels have been found in their areas, even though, as the website notes, regardless of geographic area, each home should be tested because elevated levels have been found in all areas of the state.

Minnesota Gold Standard Builders Committed to Radon Resistant New Construction Number More than 100

By Margaret Henderson

Minnesota’s high risk for indoor radon exposure, due to the relatively high source content in its soils, coupled with the practice of building homes with basements used as living spaces where concentrations are often the highest, makes a focus on building practices important to preventing the radon problem during the building process. Almost 80% of Minnesota counties are in Zone 1, the EPA designated high radon zone, where potentially concentrations may exceed the 4 pCi/L action level recommended by EPA.

Since June of 2009, radon resistant new construction (RRNC) features have been built into new homes. Passive radon systems must be installed during construction, as required by the state building code. The code began by requiring passive systems for one to three unit homes and expanded the requirement to multi-family homes.