Conference Call 1Q14 Results May/2014 Economic-Financial Office and Investor Relations Office

Notice This presentation may contain forward-looking statements referring to SABESP’s business outlook. operating and financial results estimates. and growth prospects. These are only projections. and as such. they are exclusively based on SABESP’s management expectation in relation to the future of business and its continuous access to capital to finance the Company’s business plan. These forward-looking statements largely depend on changes in market conditions. governmental rules. industry performance and the Brazilian economy. amongst other factors. in addition to risks exhibited in disclosure documents filed by SABESP. Therefore. they are subject to changes without prior notice. 2

Total water and sewage billed volume, including wholesale (million m³) 5.2% 923.9 968.7 5.5% 4.9% 3

Financial Highligts (R$ million) 4

Costs and Expenses (R$ million) Costs and expenses in 1Q13*: R$1,432.6 Costs and expenses in 1Q14*: R$1.515,5 5.8% 7.6% *Not including construction costs 37.6% 33.3% (29.1%) (3.3%) 7.4% 6.3% (60.7%) (50.9%) % Net Revenue in 1Q13 17.5% 1.7% 2.5% 8.6% 5.5% 8.1% 7.4% 1.4% 1.5% % Net Revenue in 1Q14 17.8% 11.3% 5.0% 9.3% 0.5% 0.7% 5

Net Income – Main variations 6

Cantareira System (oct/13 apr/14) As of May 16, 2014 7

Technical Reserve 8 Entrance 30.5 m height Depth Discharge Tunnel 10 Floor Building Entrance Depth Discharge Useful Volume Tunnel Volume Available PCJ Rivers Technical Reserve RMSP Supply 8

The Path of the Waters Cantareira System 9

Consumers served by the Cantareira System Bonus Program Bonus Program 20% water bill savings = 30% discount on water and sewage bill Scope: Since February  consumers served by the Cantareira System Since April  all consumers directly served in the SPMR Bonus Program Balance Consumers served by the Cantareira System In April In March Reached the Bonus Reduced Consumption Increased Consumption Reached the Bonus Reduced Consumption Increased Consumption 10

www.sabesp.com.br IR Contacts Mario Azevedo de Arruda Sampaio Angela Beatriz Airoldi maasampaio@sabesp.com.br abairoldi@sabesp.com.br (55 11) 3388-8664 (55 11) 3388-8793