Understanding Radon Levels in York PA: A Homeowner's Guide to Testing and Mitigation

If you own a home in York County, you have probably heard about radon. It is a radioactive gas that comes from the natural decay of uranium in the soil. You cannot see it, smell it, or taste it. But it can accumulate inside your home and, over years of exposure, increase your risk of lung cancer. I have spent years working with homeowners across south-central Pennsylvania, and I can tell you that radon levels in York PA are a serious concern. The local geology, combined with the region's older housing stock, means that many homes here exceed the US EPA radon map's recommended action level of 4 picocuries per liter.

When I first moved to the area, I did not think much about radon. My house was built in the 1950s, with a basement slab that had visible cracks. A neighbor mentioned that her short-term radon test came back at 8 pCi/L, which is double the EPA guideline. That got my attention. I ran a home radon test kit from the local hardware store, and my results were even higher. That experience led me to learn everything I could about radon mitigation, and eventually to help others do the same. In this article, I will share what I have learned about testing, interpreting results, and reducing radon levels in York PA.

Why Radon Is a Problem in York County

York County sits on a geological formation known as the Piedmont region, which contains granite and other uranium-bearing rocks. As those rocks break down over time, they release radon gas into the soil. The gas then moves upward through the ground and can enter your home through gaps around pipes, cracks in the basement slab, or openings in a crawl space. According to the Pennsylvania Department of Environmental Protection, about 40% of homes in the state test above the EPA action level. In York County, the numbers are often higher, especially in older neighborhoods with unsealed foundations.

The US EPA radon map classifies York County as Zone 1, meaning it has the highest potential for elevated indoor radon levels. That does not guarantee your home has a problem, but it means you should test. I have seen homes just a few blocks apart with very different results. The only way to know is to measure.

How to Test for Radon

Testing is straightforward. You can buy a home radon test kit online or at a hardware store. There are two main types: short-term and long-term. A short-term radon test typically lasts 2 to 7 days and gives you a quick snapshot. These are useful if you are in the middle of a real estate transaction and need an answer fast. But radon levels can vary by season and weather, so a short-term test is not the final word.

A long-term radon test runs for 90 days to a full year. It gives you a more accurate average of your home's exposure. I always recommend starting with a long-term test if you have the time. The Pennsylvania Department of Environmental Protection sells test kits at a low cost, and many local health departments offer them too. Place the kit in the lowest livable level of your home, follow the instructions, and mail it to a lab. Results usually come back within a couple of weeks.

If your test result is 4 pCi/L or higher, the EPA recommends fixing your home. Do not panic. A high reading does not mean you have to move out tomorrow. But it does mean you should take action. The first step is to confirm with a second test, ideally a long-term one. If the levels remain high, you need a radon mitigation system.

What a Radon Mitigation System Looks Like

The most common and effective method is sub-slab depressurization. A contractor drills a hole through the basement slab, digs a small pit underneath, and installs a pipe that runs from that pit up through the roof. A radon fan attached to the pipe creates suction, pulling radon from beneath the house and venting it safely outside. The system is quiet, runs 24/7, and typically costs between $800 and $1,500, depending on the complexity of the installation.

In homes with a crawl space instead of a full basement, the approach is similar. The contractor lays a vapor barrier over the dirt floor and seals the edges. Then they run a vent pipe and fan to pull radon from under the barrier. For both types of homes, a radon sealant is often applied to cracks and joints in the foundation before the system is installed. This helps prevent radon from entering through small openings.

I have seen systems bring levels from 20 pCi/L down to below 2 pCi/L. The key is proper installation. That is why radon contractor certification matters. In Pennsylvania, there is no state licensing requirement, but the Pennsylvania Department of Environmental Protection maintains a list of certified professionals who have passed an exam and follow industry standards. Always check that list before hiring.

Radon and Real Estate Transactions

If you are buying or selling a home in York County, radon testing is common. Most buyers request a short-term radon test as part of the home inspection. If the result is high, the buyer may ask the seller to install a mitigation system or negotiate a credit. Pennsylvania does not have a law that requires disclosure of radon test results, but Act 37 does require sellers to disclose known lead-based paint hazards for homes built before 1978. Radon is handled differently. Many buyers simply ask for the test and go from there.

I once worked with a couple who were selling their home in York. Their test came back at 7 pCi/L. They were worried it would kill the deal. But after installing a sub-slab depressurization system, the follow-up test showed 1.2 pCi/L. The buyer was satisfied, and the sale went through. The system actually became a selling point, because the new owners knew the home was safe.

New Construction and Radon-Resistant Construction

If you are building a new home, you have the opportunity to include radon-resistant construction from the start. This involves placing a layer of gravel under the basement slab, a vapor barrier on top, and a vent pipe that runs up through the roof. No fan is needed initially, because the stack effect of the pipe can provide some natural ventilation. If radon levels later turn out to be high, a fan can be added easily. This approach is inexpensive and much cheaper than retrofitting a system later.

Many builders in York County are now including this as standard practice, especially in Zone 1 areas. But it is not required by state law. You have to ask for it. If you are working with a contractor, mention radon-resistant construction early in the planning process. It can save you thousands of dollars down the road.

Monitoring Over Time

After you install a mitigation system, you should verify that it is working. A radon monitor can give you continuous readouts and alert you if levels spike. These devices range from simple digital detectors to more advanced models that connect to your phone. I keep one in my basement just to stay informed. Radon levels can change if the fan fails, if the house settles and cracks form, or if you make changes to the foundation.

It is also a good idea to retest every two years, even if you have a system in place. The Pennsylvania radon data from the Department of Environmental Protection shows that levels can vary over time due to changes in the soil or weather patterns. A long-term test every couple of years gives you peace of mind.

Community Outreach and Shared Responsibility

Radon is not just a personal problem. It affects whole neighborhoods. In some parts of York, I have seen community outreach program efforts where a local nonprofit helps arrange group discounts on test kits. When neighbors test together, they learn from each other and share resources. I have also seen churches and civic groups host informational meetings about indoor air quality. The more people know, the more likely they are to act.

The Pennsylvania Department of Environmental Protection runs a radon division that provides free educational materials and supports local testing initiatives. If you are a renter, you can ask your landlord to test the unit. There is no law requiring them to do so, but many will comply if you explain the health risks. And if you own a rental property, testing is a responsible step for protecting your tenants and your investment.

Final Thoughts

Radon levels in York PA are something every homeowner and renter should take seriously. The good news is that testing is cheap and mitigation is effective. You do not need to be an expert. You just need to test, interpret the results honestly, and take action if needed. Whether you install a radon mitigation system yourself or hire a certified radon contractor, the investment is small compared to the health benefits. I have seen too many people ignore a high test result because they did not want to deal with it. The reality is that you can fix it, and once it is fixed, you can stop worrying.

If you live in York County and have not tested your home, I encourage you to buy a home radon test kit this week. It takes a few minutes to set up, and the result could be the most important number you ever get about your home. For those who have already tested and found high levels, do not wait. Contact a certified radon contractor and get a mitigation system in place. Your lungs will thank you.