Two projects of water treatment for public water supply were developed and operated by using combined systems of constructed wetlands. One of the projects was carried out in the town of Analândia, São Paulo, Brazil and wetlands with floating aquatic plants associated to the HDS system were used. Nearly 6,480 inhabitants were supplied. The other conducted project was an experimental station in partnership with SABESP (São Paulo State Sanitation Agency / Brazil), for the pretreatment of 1,700 l.s−1 of waters from the Cotia River, which is used for the population's supply after conventional treatment at the Lower Cotia Water Treatment Station. For this pilot project, wetlands with emergents and floating plants associated to the HDS system were used. The proposed objectives were achieved in both projects.

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