Conference Call 3Q18

November/2018

Economic-Financial Office and Investor Relations Office

LEGAL NOTICE

This presentation may contain forward-looking statements referring toSABESP’s business outlook. operating and financial results estimates. andgrowth prospects. These are only projections. and as such. they are exclusivelybased on SABESP’s management expectation in relation to the future ofbusiness and its continuous access to capital to finance the Company’s businessplan. These forward-looking statements largely depend on changes in marketconditions. governmental rules. industry performance and the Brazilianeconomy. amongst other factors. in addition to risks exhibited in disclosuredocuments filed by SABESP. Therefore. they are subject to changes withoutprior notice.

2

Total water and sewage billed volume, including wholesale

Historical Billed Volume

BILLED VOLUME (million m3)

3

0.1%

0.1%

0.2%

923.9922.8

1.7%

1.8%

1.7%

2,799.02,750.9

385 380 371 363 368 379 382 386 386 399 405 395 404 414 413 408 404

508 501 485 472 473484 490 494 495 512 520 509 519 528 531 523 520

892 881 856 835 841 863 872 880 880910 925 904 923 942 944 931 924

3Q14 4Q14 1Q15 2Q15 3Q15 4Q15 1Q16 2Q16 3Q16 4Q16 1Q17 2Q17 3Q17 4Q17 1Q18 2Q18 3Q18

Sewage Water Water + Sewage

FINANCIAL HIGHLIGTHS (R$ million)

4

623,4

39.860,1

288,4

203,6184,4

324,5

-34,4

21,6

692,2

61,0 58,1

366,5

241,5216,7

342,5

19,3 13,5

Salaries and payrollcharges and Pension

plan obligations

General Supplies Treatment Supplies Services Electricity General Expenses Depreciation andAmortization

Allowance for doubtfulaccounts

Tax Expenses

3Q17 3Q18

11.0%

% Net Revenue in 3Q17

17.6% 1.1% 1.7% 8.2% 5.8% 5.2% 9.2% -1.0% 0.6%

% Net Revenue in 3Q18

18.2% 1.6% 1.5% 9.6% 6. 3% 5.7% 9.0% 0.5% 0.4%

5.5%

53.3%-3.3%

27.1%

18.6% 17.5%

-37.5%-156.1%

Costs and expenses of 3Q17*: R$1,711.4

Costs and expenses of 3Q18*: R$2,011.3

*It does not consider construction costs

COSTS AND EXPENSES (R$ million)

5

17.5%

(*) Including Equity Result

3Q18 3Q17 ChangeNet Income 3Q17 900.5

Net Operating Revenue 3,810.8 3,536.5 274.3 Costs and Expenses (2,719.2) (2,405.9) (313.3)

Other Revenue and Expenses (*) 34.7 15.8 18.9Net Financial (262.8) 222.9 (485.7)Income Tax and Social Contribution (298.3) (468.8) 170.5

Net Income 3Q18 565.2

NET INCOME – MAIN VARIATIONS (R$ million)

6

N.O.R. Costs and

Expenses

Other Rev.

and

Expenses(*)

Net Financial Income Tax

and Social

Contribution

3Q18

Net Income

3Q17

Net Income

18.9

(313.3)

900.5

170.5

(485.7)

565.2

274.3

Guarapiranga Alto Tietê

SPMR – WATER SITUATION

Cantareira

*Long Term Average – Oct/17 to Sept/18

RAINFALL IN THE MAIN WATER PRODUCTION SYSTEMS (mm)

60,4

61,562,3

61,660,6

59,7 59,8 59,4

61,3

52

54

56

58

60

62

64

jan fev mar abr mai jun jul ago set out nov dez

2016 2017 2018

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

AVERAGE PRODUCTION (m³/s)VOLUME STORAGE (%)

51.7%

7.7%11.0%

47.3%

53.7%

40.6%43.4%

-10

10

30

50

70

90

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

Vo

lum

e St

ore

d (

%)

Oct12/Sep13 Oct13/Sep14 Oct14/Sep15 Oct15/Sep16

Oct16/Sep17 Oct17/Sep18 Oct 18/Sep 19

62.2

76%

101%

58%

105%

47%

91%

26%17%32%24%

213%61%

149%

-

50

100

150

200

250

300LTA

2017/2018

2018/201988%

111%

53%

80%

26%

120%

92%

34%45%27%

81%51%

149%

-

50

100

150

200

250

LTA

2018/2018

2018/2019

87%

139%

49%

79%

28%

80%

70%

18%31%27%

120%50%

122%

-

50

100

150

200

250

300LTA

2017/2018

2018/2019

7

www.sabesp.com.br

Mario Azevedo de Arruda SampaioHead of Capital Markets and Investor Relationsmaasampaio@sabesp.com.br+55 (11) 3388-8664

Angela Beatriz AiroldiInvestor Relations Managerabairoldi@sabesp.com.br+55 (11) 3388-8793

IR Contacts