Why well water here needs testing first
Once you leave the aquifer north of Spokane, homes increasingly rely on private wells drilled into granite and other bedrock. Bedrock wells pick up whatever minerals the rock contains, so neighbors can have very different water.
The Spokane Regional Health District notes that some areas of Spokane County have private wells with elevated uranium and/or arsenic and recommends testing. A USGS study of northeastern Washington found that about 5% of more than 1,700 historically sampled wells exceeded the 30 µg/L uranium standard, with the highest concentrations in north-central Stevens County. Uranium and arsenic have no taste, color or smell, so a lab test is the only way to know.
More visible problems are common too: orange-brown iron staining, black manganese deposits, rotten-egg sulfur odor, and hard water scale.
Town by town
- Mead and Colbert: parts of the area are served by Whitworth Water District and other small systems, and many homes on larger lots are on private wells.
- Deer Park: city homes are on Deer Park's municipal wells; surrounding rural homes are mostly on private wells.
- Chewelah and Colville (Stevens County): in-town homes are on city systems, while the surrounding countryside is predominantly private wells. Stevens County is where the USGS found the region's highest uranium concentrations.
What we usually install on wells here
- Iron and manganese: an oxidizing iron filter such as Water Right's Iron Curtain ahead of the softener. See Water Right systems.
- Hardness: a softener sized to measured hardness, after iron is handled.
- Bacteria: UV disinfection after filtration. See UV water purification.
- Uranium or arsenic: reverse osmosis at the drinking water tap, chosen and verified against your lab result. See drinking water systems.