TDY Industries LLC - ATI Firth Sterling Stormwater Outfall, Huntsville, Alabama

TDY Industries LLC - ATI Firth Sterling is a stormwater outfall located at 7300 Highway 20 in Huntsville, Alabama, within Madison County. The facility is operational and serves industrial activities classified under NAICS codes 331221 (Rolled Steel Shape Manufacturing), 331492 (Secondary Smelting, Refining, and Alloying of Nonferrous Metal), and 332117 (Powder Metallurgy Part Manufacturing). As a stormwater outfall, it discharges runoff from these metalworking operations into local waterways, subject to the Clean Water Act and EPA's NPDES MS4 permit framework. The facility operates under Alabama's stormwater management regulations, which require industrial facilities to obtain permit coverage for stormwater discharges. The outfall likely handles runoff from impervious surfaces and process areas typical of heavy industrial sites. The regulatory context includes compliance with effluent guidelines for the metal manufacturing sector and local MS4 requirements for the Huntsville urban area. Environmental significance lies in the outfall's role in managing industrial stormwater runoff, which can contain pollutants such as metals, oils, and sediments. Proper operation helps protect receiving waters in the Tennessee River basin from contamination. The facility's location in an industrial corridor underscores the importance of stormwater treatment and monitoring to meet water quality standards and support community and ecological health.

The outfall discharges into the Tennessee River watershed, which supports diverse aquatic life and provides drinking water for the region. Industrial stormwater runoff from metal manufacturing can introduce heavy metals and other pollutants, necessitating robust treatment and monitoring. The facility operates under Alabama's NPDES program, which requires compliance with water quality standards to protect downstream ecosystems and recreational uses.