Subcatchment stream solute export is driven by unique ecosystem characteristics and related terrestrial and aquatic processes. As climate change induces variations in precipitation regimes and stream flow, established stream solute export patterns are anticipated to undergo significant alterations. Headwater stream networks are particularly susceptible to these changes due to their close-knit terrestrial-aquatic interactions and role as biogeochemical hotspots. Despite their critical contributions to defining downstream chemistry, the influence and interplay of unique subcatchment characteristics on catchment-wide solute exports is not well known. To address this knowledge gap, we conducted monthly stream water chemistry sampling campaigns on over twenty sites within strategically chosen tributaries and mainstem streams in the mountainous headwaters of the Santa Fe Municipal Watershed, a major source of drinking water for the City of Santa Fe in New Mexico, USA. In addition, we characterized subcatchments according to their drainage area, elevation, and slope, and recorded tributary stream parameters such as stream connectivity and network position, pH, dissolved oxygen, and specific conductivity (SpC). We calculated tributary leverage, a novel ecohydrological metric, and used it to identify subcatchments that disproportionately affect catchment-wide solute exports. Preliminary data suggests that small tributaries, on average, have greater leverage than mainstem sites. These smaller flowing tributaries also appear to disproportionately contribute sulfate and calcium to catchment-wide exports. Greater variance in leverage is associated with greater stream specific conductivity, yet this does not explain specific solute exports in most sub-catchments. These findings help identify unique subcatchment characteristics driving catchment-wide solute exports. Ongoing work to identify seasonally variable sources of streamflow and patterns of terrestrial and in-stream nutrient uptake will provide insights into the mechanisms underlying these patterns.