{"permit":"MD0021237","name":"Aberdeen Proving Ground, Aberdeen Area WWTP","state":"MD","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MD0021237"},"about":[{"label":"What it is","text":"Federal facility · National Security (EPA's industry listing) · rated a major discharger by EPA"},{"label":"Where","text":"Aberdeen, Maryland","href":"https://www.openstreetmap.org/?mlat=39.470833&mlon=-76.095833#map=14/39.470833/-76.095833"},{"label":"Last 12 months","text":"Over a limit 5 times, last in March 2026 (BOD, 5-day, 20 deg. 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