08/01/2026 | Press release | Distributed by Public on 08/01/2026 01:21
Happy National Water Quality Month! Every August, National Water Quality Month reminds us how precious our fresh water is to our community. Clean water is vital to our health, our region's agriculture, and the natural world around us.
Every drop of water that comes out of your tap starts out in a river or in a dam and reservoir. Hillsboro's primary water source is the upper Tualatin River and its tributaries, which stretch nearly 80 miles from the Tillamook State Forest to where the river meets the Willamette near West Linn.
In the summer, the Tualatin's flow drops too low to meet our community's demand. Two reservoirs supplement river levels.
The Barney Reservoir is located in the Trask River Watershed and holds 20,000 acre-feet of water at capacity, of which 14,886 acre-feet is available for drinking water.
The Scoggins Reservoir - also known as Hagg Lake - is located near Gaston. The reservoir stores approximately 53,323 acre-feet of water when full, of which 13,500-acre feet is available for drinking water.
An acre-foot is the amount that covers an acre with a foot of water and is equal to 325,851 gallons.
Looking ahead, Hillsboro will soon add a secondary year-round water source in the Willamette River. At 187 miles long, it's the 19th-largest river in the country by volume. It originates south of Eugene, with the future intake for Hillsboro in Wilsonville.
Small changes add up to make a big difference. Thank you for doing your part to protect the rivers and reservoirs we all rely on.