SECURITIES AND EXCHANGE COMMISSIONSEC FORM 17-C

CURRENT REPORT UNDER SECTION 17
OF THE SECURITIES REGULATION CODE
AND SRC RULE 17.2(c) THEREUNDER

1. Date of Report (Date of earliest event reported)

Dec 15, 2025

2. SEC Identification Number

A1996-11593

3. BIR Tax Identification No.

005-038-428-000

4. Exact name of issuer as specified in its charter

Manila Water Company, Inc.

5. Province, country or other jurisdiction of incorporation

Quezon City, Philippines

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

MWSS Administration Building, No. 489 Katipunan Road, Balara, Quezon City Postal Code 1105

8. Issuer's telephone number, including area code

09171547921

9. Former name or former address, if changed since last report

n/a

10. Securities registered pursuant to Sections 8 and 12 of the SRC or Sections 4 and 8 of the RSA

Title of Each Class	Number of Shares of Common Stock Outstanding and Amount of Debt Outstanding
Common	2,601,499,272
Preferred (Unlisted)	3,563,756,068

11. Indicate the item numbers reported herein

-

The Exchange does not warrant and holds no responsibility for the veracity of the facts and representations contained in all corporate disclosures, including financial reports. All data contained herein are prepared and submitted by the disclosing party to the Exchange, and are disseminated solely for purposes of information. Any questions on the data contained herein should be addressed directly to the Corporate Information Officer of the disclosing party.

Manila Water Company, Inc.MWC

PSE Disclosure Form 4-30 - Material Information/Transactions References: SRC Rule 17 (SEC Form 17-C) and
Sections 4.1 and 4.4 of the Revised Disclosure Rules

Subject of the Disclosure
Standard Rates Table for Charging Year 2025 and Foreign Currency Differential Adjustment (FCDA)
Background/Description of the Disclosure
Please be informed that Manila Water Company, Inc. received today, December 15, 2025, the Metropolitan Waterworks and Sewerage System’s (MWSS) approval of the following, effective January 1, 2026: a. the Company’s Standard Rates Table for Charging Year 2026; b. the adjustment of the Environmental Charge from 25% to 30%; and c. the implementation of an FCDA of 0.70% of the 2026 Average Basic Charge of PHP50.70 per cubic meter or PH₱0.35 per cubic meter, for the first quarter of 2026. As provided in the Amended Revised Concession Agreement (RCA), the FCDA is a pass-through charge to account for foreign exchange losses or gains arising from the Company’s payment of specific concession loans identified in the Amended RCA. The FCDA has no impact on the projected net income of the Company. The rates, as approved by the MWSS shall be effective fifteen (15) days after publication in a newspaper of general circulation, pursuant to the MWSS Charter.
Other Relevant Information
-