Abstract: Persistent pesticide contamination of subsoils and groundwaters is a significant problem in Denmark as it may spoil our drinking water resources. Most of the removal of the pesticide contaminants is performed by the soil microorganisms possessing the enzyme systems needed to break down the contaminants. However, for many types of pesticides the microbial breakdown of the pesticide is efficient only in the presence of oxygen – and, hence, the degradation are often proceed very slowly in subsoils at reduced conditions. Aiming to accelerate the degradation process, we amended soil samples (taken from a phenoxy acid-contaminated industrial site) with nitrate which can be employed as an alternative electron acceptor (used instead of oxygen) by soil some microorganisms. We also added bacteria, known to be able to degrade phenoxy acids, to the soil samples to evaluate if they would accelerate the removal (remediation) of the contaminants.  A new project with an in situ-remediation approach strategy will also be presented.