The Province of Utrecht is preparing the remediation of the contaminated soil at Park Vliegbasis Soesterberg. Recently completed soil studies show that due to high groundwater levels, more PFAS is leaching from the contaminated subsoil into the groundwater. The Province of Utrecht is currently considering various options to carry out the remediation as effectively as possible. This situation has no impact on the housing plans.
In 2024, additional soil research was conducted at the former airbase in Soesterberg. Higher concentrations of PFAS were found than expected. This is due to the exceptionally wet weather conditions in 2023 and 2024, causing the groundwater level to fluctuate significantly. This had a negative effect on the contamination and requires a recalibration of the remediation approach. Due to climate change, the likelihood of extreme weather increases, meaning both high and low water levels will play a more frequent role.
The same situation applies to a second location where PFAS was found in the soil: the old fuel station. This site is also included in the remediation. PFOS was present in the firefighting foam used in training exercises. This substance, along with many others, belongs to the PFAS group of chemicals.
Learning and remediating
Now that the studies are completed, several soil specialists have described multiple options to carry out the remediation carefully. In the coming period, the Provincial Executive will decide which option best fits the remediation task. Afterwards, a definitive implementation plan for the remediation will be drawn up. In spring 2026, a decision will be made on the final plan and financial coverage. All options ensure a safe living environment in the area.
The soil and groundwater contamination at the former airbase is among the larger remediation challenges in the country. Remediating PFAS-contaminated soil is relatively new in the Netherlands. Therefore, research is being conducted on how the substance behaves exactly and which measures are most effective. This requires a careful and learning approach.
The soil and groundwater remediation is necessary to protect nature and groundwater and to make the location near the former fire station suitable for housing. The province also wants to prevent future problems for drinking water supply caused by groundwater contamination through this remediation.
For press information:
jiri.glaap@provincie-utrecht.nl
06 39 63 21 97
