Patapsco Valley State Park RV dump station in Ellicott City, Maryland.
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Patapsco Valley State Park – Hollofield Area, 8020 Baltimore National Pike, Ellicott City MD 21043 / 410-461-5005. Monday-Thursday during camping season. RVs over 11 feet 1 inch in height must use eastbound entrance. Potable water. Rinse water. Dumpster available. $10 or less. Last updated: 5/22/2024 Patapsco Valley State Park – Hollofield Area, 8020 Baltimore National Pike, Ellicott City MD 21043 / 410-461-5005. Monday-Thursday during camping season. RVs over 11 feet 1 inch in height must use e
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