MESA S_T FACILITY Wastewater Treatment Plant, Mesa, Washington

MESA S_T FACILITY is a municipal wastewater treatment plant located in Mesa, Franklin County, Washington, United States. The plant serves a small population of 440 residents, reflecting its role in a rural community. It is situated inland, far from coastal waters, and operates under the regulatory framework of the US Clean Water Act. The plant provides secondary treatment, a standard level for small communities in the United States. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's designed capacity is 234.69 units, with a current discharge volume of 158.99 units, indicating it operates below its maximum capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Columbia River basin. The Columbia River is a major waterway in the Pacific Northwest, supporting diverse aquatic life and providing water for irrigation, industry, and recreation. The plant's operations help protect downstream water quality in this ecologically significant region.

The plant discharges into the Columbia River basin, a vast watershed that drains into the Pacific Ocean. The Columbia River supports salmon runs and other migratory fish species, making water quality critical for regional ecology. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream habitats in the river and estuary.