Notice of Filing and Public Hearing Application of Kiawah Island Utility, Inc. for Approval of an Adjustment in Rates and Charges and Modifications to Certain Terms and Conditions for the Provisions of Water and Sewer Service Docket No. 2025-243-WS Why is this Notice Important? • Kiawah Island Utility, Inc. (“KIU” or “the Company”) is requesting a rate increase and changes to the Company’s water and wastewater rates, and the Company filed an Application with the Public Service Commission (“Commission”). • KIU is requesting an adjustment in rates designed to achieve additional annual revenues of $1,301,330. • On July 3, 2025, in Order No. 2025-401, Docket No. 2025-61-WS, the Public Service Commission approved the consolidation of Kiawah Island Utility, Inc., South Carolina Water Utilities-CUC, Inc., and South Carolina Water Utilities, Inc.’s Harbor Island and T.J. Barnwell Systems. These systems are part of this application. A summary of the bill impacts for residential 5/8” water customers, using 6,000 gallons per month, is shown below. KIU CUC HIU RESIDENTIAL WATER Current Proposed Current Proposed Current Proposed Base Charge $36.65 $34.10 $25.80 $34.10 $32.09 $34.10 Volume Rate (per 1,000 gal.): Up to 11,000 gal./month $5.98 $7.33 $7.38 $7.22 $6.49 $7.92 11,000-50,000 gal./month $6.59 $7.66 $7.38 $7.55 $6.49 $8.25 Over 50,000 gal./month $6.97 $7.89 $7.38 $7.78 $6.49 $8.48 Volume Charge (based on usage of 6,000 gallons/month) $35.88 $43.98 $44.28 $43.32 $38.94 $47.52 Total Bill $72.53 $78.08 $70.08 $77.42 $71.03 $81.62 Change % 7.65% 10.47% 14.91% A summary of the bill impacts for residential 5/8” sewer customers, using 6,000 gallons per month, is shown below. RESIDENTIAL KIU CUC HIU TJB SEWER Current Proposed Current Proposed Current Proposed Current Proposed Base Charge $28.00 $28.62 $25.80 $28.62 $59.24 $28.62 $53.00 $59.51 Volume Rate: Up to 11,000 gal./month $0.74 $1.61 $6.35 $6.77 $6.77 Volume Charge $4.44 $9.66 $38.10 $40.62 $40.62 Total Bill $32.44 $38.28 $63.90 $69.24 $59.24 $69.24 $53.00 $59.51 Change % 18.00% 8.36% 16.88% 12.28% The case was filed according to S.C. Code Ann. Section 58-5-240; this hearing has been scheduled according to S.C. Code Ann. Section 58-5-240 and S.C. Code Ann. Regs. 103-817. A public hearing has been scheduled in this case to begin on Thursday, February 5, 2026 at 10:00 A.M. and continuing Friday, February 6, 2026, if necessary and at the call of the Chairman, at the Public Service Commission, Hearing Room, 101 Executive Center Drive, Columbia, SC 29210. For information on this entire Case, visit: https://dms.psc.sc.gov/Web/Dockets/Detail/119288 Intervention deadline: Friday, December 12, 2025 Manner of filing Intervention: Email a Petition to Intervene to contact@psc.sc.gov or mail a Petition to Intervene to 101 Executive Center Drive, Suite 100, Columbia, SC 29210. Please include your email address. You must give a copy of your Petition to Intervene to all Parties in this case. Manner to file Letters of Protest: File Public Comments or Letters of Protest by emailing contact@psc.sc.gov or mail Public Comments or Letters of Protest to 101 Executive Center Drive, Suite 100, Columbia, SC 29210. For questions regarding this filing, contact the Office of Regulatory Staff at 1-800-922-1531, the South Carolina Department of Consumer Affairs at 1-800-922-1594, Kiawah Island Utilities, Inc. at 843-768-0641, or for public information on this filing, contact the Public Service Commission at 1-803-896-5100. 10/10/2025 GRR