The seats in the boards of directors of the intercommunales are distributed according to political majorities in the communes. "Most "intercommunales" are controlled by coalitions between the (Walloon) Socialist Party and the (Walloon) Christian Democrats Party." The "Intercommunale bruxelloise de distribution d’ eau" (IBDE) is in charge of water distribution and billing for 19 municipalities in the Brussels region. Previously the "Intercommunale Bruxelloise d'Assainissement" (IBRA) had been in charge of stormwater drainage and sanitary sewers in the Brusels region, which had only been created in 2000 to replace four "Intercommunales" for Sanitation. The former "Compagnie Intercommunale Bruxelloise des Eaux" (CIBE), renamed Vivaqua in 2006, sells bulk water to the city of Brussels. It also operates its sewer network and the Brussels-South wastewater treatment plant on behalf of IBDE. Vivaqua also provides services to other municipalities and intermunicipal associations in both Flanders and Wallonia with a total of 309,000 connections and 2.1 million direct and indirect clients. BELGAQUA is the Belgian federation for the water and sanitation sector representing its member utilities. It regroups three regional trade associations:  Aquawal is the trade association of public water and sanitation service providers in Wallonia. Water tariffs throughout Belgium are increasing-block tariffs with higher unit prices for higher consumption. The number and size of blocks as well as tariff levels for each block vary between regions and service providers. Although PIDPA (in the Flemisch Region, the Antwerp Campine (de Kempen in Dutch)) has changed this in 2009. The unit price has risen for those who have a low consumption (<250 Cu meter/year), and fallen for higher volumes (+ 250 Cu meter/year). The price is now the same. Flemish region. Everyone has the right to a minimal supply of 15 cubic meters (41 liter/capita/day) of free water per "person" per year. Concerning sanitation, those living under the Minimum Subsistence Level are exempt from the sanitation tax. Walloon region. For water, there is an increasing-block tariff with four blocks of consumption. The first block is up to 30 cubic meter per "household" per year (82 liter/household/day). Brussels region. The increasing-block tariff has also four blocks, the highest beginning at 60 cubic meter per "person" per year.