High Risk

ZIP Code 54979

Fond du Lac County, Wisconsin — Van Dyne

Zone 1EPA Classification
>4Predicted pCi/L
43.5%Above action level
0246810
>4pCi/L
Above EPA action level

What This Means

Fond du Lac County, Wisconsin is in EPA Radon Zone 1, the highest risk category. The EPA predicts average indoor radon levels greater than 4.0 pCi/L in this area — above the EPA action level. The EPA strongly recommends testing all homes in Zone 1 areas. If your home tests above 4.0 pCi/L, a radon mitigation system can reduce levels by up to 99%.

What You Should Do

1
Test your home immediately. Purchase a short-term radon test kit ($10–$30) or hire a certified professional. Place the test on the lowest livable level of your home.
2
If your test result is 4.0 pCi/L or higher, install a radon mitigation system. A qualified radon mitigator can install an active soil depressurization system for $800–$1,500, reducing levels by up to 99%.
3
Re-test within 24 hours of installation to confirm the system is working, then test again every 2 years to ensure continued effectiveness.

EPA Zone Details

ZIP Code54979
CountyFond du Lac
CityVan Dyne
StateWisconsin (WI)
EPA Radon ZoneZone 1 — High
Predicted Indoor Radon>4 pCi/L

Source: EPA Map of Radon Zones

CDC Testing Data

Homes Tested23
Above 4.0 pCi/L10
% Exceeding Action Level43.5%

Source: CDC Environmental Health Tracking Network

Radon & Your Basement in Fond du Lac County

Fond du Lac County is in EPA Zone 1, the highest risk category. Basements and ground-level rooms in this area are very likely to have elevated radon concentrations. If your home has a basement, it should be your first testing location.

Radon concentrations are typically highest in the lowest level of a home. However, radon does not stay confined to the basement — it migrates to upper floors through stairways, HVAC ducts, and gaps in flooring. Even if your basement is unfinished or rarely used, elevated radon there can affect the air quality on your main living floors. Always test on the lowest livable level.

Fond du Lac County Radon Map

Counties colored by EPA radon zone. Red = Zone 1 (high), Orange = Zone 2 (moderate), Green = Zone 3 (low).

Check Another ZIP Code

Nearby ZIP Codes

54976 Saxeville, WI Moderate 54977 Scandinavia, WI High 54978 Tilleda, WI High 54980 Waukau, WI Moderate 54981 Waupaca, WI High 54982 Wautoma, WI Moderate

Frequently Asked Questions

What is the radon risk level for ZIP code 54979?

ZIP code 54979 is in Fond du Lac County, Wisconsin, which is classified as EPA Radon Zone 1 (high risk). The predicted average indoor radon level is >4 pCi/L.

Should I test for radon in 54979?

Yes. The EPA recommends testing all homes for radon regardless of zone. Since 54979 is in a high-risk Zone 1 area, testing is especially important.

What county is ZIP code 54979 in?

ZIP code 54979 is in Fond du Lac County, Wisconsin (WI).

Is it safe to live in ZIP code 54979?

ZIP code 54979 is in a high-risk EPA Zone 1 area. While this does not mean every home has dangerous radon levels, the probability is elevated. The EPA strongly recommends testing all homes in this zone. With proper mitigation, homes in high-risk areas can achieve safe radon levels.

Does radon in the basement affect upper floors in Fond du Lac County?

Yes. Radon enters through the foundation and can migrate to upper floors through stairways, HVAC systems, and structural gaps. While concentrations are typically highest at the lowest level, upper floors in Fond du Lac County homes can still have measurable radon. Always test on the lowest livable floor.

How much does radon mitigation cost in Wisconsin?

In Wisconsin, radon mitigation systems typically cost between $800 and $2,500 depending on home size, foundation type, and local labor rates. The most common system (sub-slab depressurization) averages $1,000-$1,500. The fan lasts 10-15 years and costs $150-$300 to replace. Some states offer financial assistance programs for radon mitigation.