Bonfol (French pronunciation: [bɔ̃fɔl]) is a former municipality in the district of Porrentruy in the canton of Jura in Switzerland.

During World War I from 1914 until 1918, the Western Front between the Allies and Germany began at the village of Le Largin in Bonfol.

[3] On 1 January 2024, Bonfol is set to merge with Beurnevésin to form the new municipality of Basse-Vendline.

[6] The municipality is located in the Porrentruy district, in the north-east corner of the Ajoie region on the border with France.

The nature preserve Etangs de Bonfol is located close to the village.

Eight of the largest, including BASF, Novartis, Roche and Syngenta, formed Basler Chemischen Industrie (BCI) to administer the site.

The dump was buried and the 20,000 square meters (4.9 acres) of land that it covered was replanted.

However, in 1981 the first leaks were detected from the dump and from 1986 through 1995 BCI installed a drainage system and built a runoff treatment plant.

After protests by Greenpeace and the passage of Switzerland’s Federal Ordinance on the Contaminated Sites in 1998, on 17 October 2000 BCI signed an agreement with the Canton to fully excavate and clean the entire dump.

It was then loaded on sealed rail cars and taken to incinerators in Germany where it was burned at temperatures up to 1,200 °C (2,190 °F) and turned into chemically stable ash.

One machinist suffered minor injuries and the project paused for several months to evaluate the hazard.

[9] The blazon of the municipal coat of arms is Argent, a Bend Azure and in chief sinister a Mullet of five of the same.

[13] The historical population is given in the following chart:[3][17] In the 2007 federal election the most popular party was the FDP which received 26.89% of the vote.

In the tertiary sector; 12 or 22.2% were in wholesale or retail sales or the repair of motor vehicles, 5 or 9.3% were in the movement and storage of goods, 4 or 7.4% were in a hotel or restaurant, 1 was the insurance or financial industry, 3 or 5.6% were in education and 3 or 5.6% were in health care.

[13] From the 2000 census[update], 447 or 65.8% were Roman Catholic, while 133 or 19.6% belonged to the Swiss Reformed Church.

This is followed by three years of obligatory lower Secondary school where the students are separated according to ability and aptitude.