Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934.

Yes ______ No ___X___

Companhia de Saneamento Básico do Estado de São Paulo – (“Company” or “Sabesp”) hereby informs its shareholders and the market in general that, on March 31, 2022, it received Official Letter 325/2022-SLS (“Official Letter”), issued by B3 S.A. – Brasil, Bolsa, Balcão, transcribed as follows:

Given the latest fluctuations in the price of the company’s securities, the number of trades and the trading volume, as shown below, we hereby request you to inform, by April 1st, 2022, if you are aware of any fact that can justify said fluctuations.

In response to the Official Letter, the Company clarifies that it is not aware of any material facts or acts that could justify potential atypical fluctuations in the number of trades and the trading volume of shares issued by Sabesp.

The Company will keep the market informed of any material information should it become aware of it, pursuant to the applicable regulation.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the city São Paulo, Brazil.

Date: April 1, 2022

Companhia de Saneamento Básico do Estado de São Paulo - SABESP

By:	/s/ Osvaldo Garcia
	Name: Osvaldo Garcia Title: Chief Financial Officer and Investor Relations Officer

FORWARD-LOOKING STATEMENTS

This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.

*Common Shares*
*Prices (R$ per share)*
*Date*	*Opening*	*Minimum*	*Maximum*	*Average*	*Closing*	*Flctn. (%)*	*No. of trades*	*Quantity*	*Volume (R$)*
03/18/2022	44.26	44.25	45.73	45.21	45.16	1.87	13,835	5,385,300	243,483,624.00
03/21/2022	45.09	44.92	45.95	45.52	45.50	0.75	14,605	3,045,700	138,639,790.00
03/22/2022	45.43	45.30	46.00	45.63	46.00	1.09	13,504	2,177,300	99,360,284.00
03/23/2022	45.72	45.35	46.04	45.65	45.73	-0.58	7,977	1,778,100	81,166,420.00
03/24/2022	45.98	45.52	46.15	45.99	46.15	0.91	10,705	3,171,400	145,849,837.00
03/25/2022	44.87	43.87	45.34	44.71	44.84	-2.83	18,890	3,750,800	167,714,047.00
03/28/2022	44.74	43.82	45.21	44.21	44.08	-1.69	13,645	3,320,100	146,771,249.00
03/29/2022	44.71	44.05	45.77	44.76	44.94	1.95	15,997	3,115,300	139,448,061.00
03/30/2022	44.95	44.66	45.43	45.07	45.24	0.66	14,600	2,684,400	120,984,576.00
03/31/2022*	45.17	45.15	47.71	46.86	47.71	5.45	23,536	7,397,900	346,702,196.00