SAN FRANCISCO – Shell Oil Company will pay California more than $19 million because of environmental violations at service stations throughout the state, officials said Friday.

The agreement, filed earlier Friday in a California state court, requires Shell to pay $17.8 million in civil penalties as well as $1.7 million in costs to state and local agencies.

The deal ends a three-year investigation into more than 1,000 Shell stations throughout the state focusing on operation and maintenance of underground storage tanks, as well as the handling of hazardous waste materials.

California Attorney General Jerry Brown said in a news release that the investigation found hundreds of violations at the company's gasoline stations in California.

"Shell Oil Company disregarded the state's underground fuel storage and hazardous waste laws, committing hundreds of environmental violations at its gasoline stations across California," Brown said.

Shell officials did not have any immediate response, but company officials in Houston said they would issue a statement later in the day.

Shell, which is based in The Hague, the Netherlands, has about 102,000 employees in more than 100 countries worldwide.

Under the terms of Friday's deal, Shell agreed to take immediate steps to improve spill and alarm monitoring, employee training, hazardous waste management and emergency response at its gasoline stations.