MARYLAND DEPARTMENT OF THE ENVIRONMENT WATER AND SCIENCE ADMINISTRATION NOTICE OF FINAL DETERMINATION Washington County Application for State Discharge Permit 21DP2563, NPDES Permit MD0063509: The Washington County Water Quality Department has applied for a permit renewal to discharge treated wastewater at an average rate of 4.50 million gallons per day (mgd) from the Conococheague Wastewater Treatment Plant (WWTP), located at 16232 Elliott Parkway, Williamsport, MD 21795 to Conococheague Creek, which is designated as Use IV-P waters, protected for holding or supporting adult trout for put-and-take fishing, and as a public water supply. Final Determination Written comments were received from the Potomac River Keeper Network (PRKN) regarding the notice of tentative determination published in The Herald-Mail newspaper on the 17th and 24th of October 2025. After a thorough review of the comments, the Department has decided to reissue the permit as proposed in the tentative determination. Per MD Environmental Article § 1–602(a)(2), an EJ score of 69.4 was calculated for this facility. This score has been calculated based on a combination of the following factors: Pollution Burden Exposure Percentile, Pollution Burden Environmental Effects Percentile, and Sensitive Population Percentile. For more information on how the score was calculated, launch the MDEnviroScreen tool from this website- https://mdewwp.page.link/EJ. Copies of the responses to comments and the final permit may be downloaded from the Department’s Wastewater Permits Interactive Search Portal using the following (case-sensitive) link: https://mdewwp.page.link/WWPPortal. On that web page, search for State Number 21DP2563, click “More Info”, and then select the desired document(s) to download. Persons wishing to review the proposed final permit may do so by contacting the Maryland Department of the Environment, Water and Science Administration, 1800 Washington Boulevard, Ste. 455, Baltimore, Maryland 21230-1708, and Attn: Mr. Yen-Der Cheng, Municipal Discharge Permits Division, or by calling (410) 537-3671 to make an appointment. Copies of documents may be obtained for $0.36 per page. Any person adversely affected by this final determination may file a petition for judicial review. Petitions for judicial review of a final determination or permit decision subject to judicial review must be filed in accordance with § 1-605 of the Environment Article, no later than 30 days following publication by the Department of this notice of final determination, and must be filed in the circuit court of the county where the permit application states that the proposed activity will occur. Petitions for judicial review must conform to the applicable Maryland Rules of Civil Procedure. Failure to file a petition for judicial review by June 15, 2026, will constitute a waiver of any right to a judicial review of this final determination. 5/8, 5/15/26 #12307349