1930s. Another period of decay followed, and by 1960 the centre and its equipment were again so dilapidated that they had to be closed. The idea of balneology had also completely changed. The Municipality repurchased the spa, including the neighbouring Château d'Entremonts. Restoration failed twice, but the project of 1974 could finally be realized two years later. The spa reopened in 1977. Prospects for further thermal springs were successful in 1982, and a new outdoor pool could be added a year later. Today, the spa welcomes more than 1200 visitors per day. During an independent test by the RTS in February 2008, it was found that the water in the shower area of the thermal center had high levels of legionella pneumophila. During another test in 2011, the same programme found no significant levels of dangerous bacteria in the waters. However, in October 2014, there was a leak of 4000l of hydrochloric acid from one of the tanks in the thermal center. No one was hurt, and the bathers remaining in the pools were asked to evacuate. Champ-Pittet manor house The 18th century manor house, near the road to Yvonand, has served as summer residence of Frédéric Haldimand, burgher of Yverdon and first Governor of Canada (1777–1786), when this territory became part of the British crown. This country-seat belongs now to Pro Natura, the Swiss League for the Protection of Nature, and is one of its two nature centres; organizing special exhibitions, audio-visual shows as well as guided tours of the nature reserve, the Grande Caricaie. Geography Yverdon-les-Bains has an area, , of . Of this area, or 31.6% is used for agricultural purposes, while or 6.3% is forested. Of the rest of the land, or 57.8% is settled (buildings or roads), or 2.7% is either rivers or lakes and or 1.8% is unproductive land. Of the built up area, industrial buildings made up 6.6% of the total area while housing and buildings made up 26.2% and transportation infrastructure made up 15.2%. Power and water infrastructure as well as other special developed areas made up 2.5% of the area while parks, green belts and sports fields made up 7.4%. Out of the forested land, 4.7% of the total land area is heavily forested and 1.6% is covered with orchards or small clusters of trees. Of the agricultural land, 27.1% is used for growing crops and 3.5% is pastures. All the