Supreme Court rules on soil cleanup cost sharing

The Supreme Court ruled April 30 that a prior-ranking party responsible for soil contamination cannot be forced to bear the entire cleanup cost if public infrastructure projects subsequently raised the applicable pollution standards. The decision sends a dispute over remediation expenses between a machinery manufacturer and the Korea Land and Housing Corp. back to the Suwon High Court for retrial.

The case centered on land designated for a public housing complex in Uiwang, where soil contamination required cleanup under stricter criteria because the site was being converted for residential use. The lower court had ordered the manufacturing company to pay the full remediation costs as the primary liable party.

The top court found that the original judgment failed to account for how the public nature of the LH project influenced the financial burden. It stated that if remediation costs increased due to heightened pollution warning criteria applied during public interest projects, such circumstances must be reflected when calculating the final share of costs borne by each responsible party.

While prior-ranking polluters generally bear the ultimate cost, exceptions exist based on principles of equity. The statutory priority order for cleanup commands is designed for swift administrative action rather than settling private financial disputes.

In determining the reasonable share of costs, judges must consider the cause of contamination, the type and volume of pollutants, the degree of contribution to the damage, and who benefits from the cleanup. Cost allocation should be decided through civil legal principles that weigh these specific factors rather than applying a rigid statutory hierarchy.

The ruling also addressed how pollution warning standards should be set when official land registry records do not match actual land usage. If a discrepancy arises because a landowner obtained proper development permits but failed to update the land category, or due to administrative errors, the standards should be based on the current status of the land.

The Supreme Court concluded that the lower court erred by forcing the plaintiff to cover all costs simply because it was the prior-ranking responsible party without considering these equitable factors.