Rising oil prices increase sewage project costs and may pass bills to homeowners

Soaring oil prices have driven up the cost of plastic pipes by up to 40 percent, potentially forcing homeowners to pay higher wastewater fees for municipal infrastructure projects, reports Danish broadcaster DR.

While fuel price hikes have been widely felt, municipalities now face rising expenses for sewage projects like pipe separation, where plastic—derived from oil—is a key material. In Store Andst near Vejen, a 22 million kroner ($3.1 million) sewage project is underway, laying 20 kilometers of plastic pipes. Though materials were purchased before oil prices surged, future projects will see higher costs.

“If we had to buy the pipes now, the extra cost would be around 2 to 2.5 million kroner,” said Carsten Sundbæk, project manager at Vejen Forsyning. He warned that homeowners along affected routes would likely bear the added expense.

Plastic, primarily made from crude oil, has seen its raw material costs jump 70 to 80 percent since May 2025, pushing pipe prices up 30 to 40 percent this year alone. Further 30 percent increases are expected in 2024.

“At some point, the funds will run out, and citizens will have to pay extra,” Sundbæk added.

Danva, the industry association for water and wastewater companies, called the trend a challenge for utilities and municipalities, which cannot abandon legally mandated projects like sewage separation despite rising costs.

“There are national and municipal requirements in wastewater plans that utilities must meet, planned years in advance,” said Karsten Bjørno, Danva’s communications director.