WHATCOM COUNTY WATER DISTRICT NO. 13 532 Sprague Valley Drive, Maple Falls, WA 98266 State Environmental Policy Act Determination of Non-Significance Date of Issuance: May 13, 2026 Lead Agency: Whatcom County Water District 13 Agency Contact: Cheryl Klessig, Office Manager, admin@wcwd13.com, 360-599-1801 Lead Agency File Number: Not applicable Description of Proposal: General Sewer Plan and WWTP Engineering Report. Prepare planning documents in accordance with state and federal regulations to plan for future design and construction of a new wastewater treatment plant. Applicant: Whatcom County Water District 13. Cheryl Klessig, Office Manager, admin@wcwd13.com, 360-599-1801 Location of Proposal: 532 Sprague Valley Drive, Maple Falls, Washington 98266 The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. Optional: The purpose of a new WWTP to serve the District, as required by the Washington State Department of Ecology, is to reduce pollutant discharge to groundwater and to serve growth as projected by the state and Whatcom County. This information is available at: www.wcwd13.com and in the office at 532 Sprague Valley Drive, in Maple Falls, Washington 98266. This DNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 14 days from the date of issuance. Comments must be submitted by: May 27, 2026, by 4:00 pm. Responsible Official: Ms. Cheryl Klessig Position/Title: Office Manager, Whatcom County Water District 13 Address: 532 Sprague Valley Drive, Maple Falls, WA 98266 Phone: 360-599-1801 Email: admin@wcwd13.com Signature Date: May 13, 2026 You may appeal this determination to Whatcom County Water District 13 at 532 Sprague Valley Drive Maple Falls, WA 98266 no later than June 3, 2026, in writing. You should be prepared to make specific factual objections. Contact Cheryl Klessig, Office Manager at admin@wcwd13.com, or 360-599-1801 to read or ask about the procedures for SEPA appeals. IPL0340898 May 15 2026