EWEB has tested water samples from the Willamette River for the last 10 years. The samples show that the water quality near the new proposed intake is similar to the water we pull from the McKenzie River less than five miles away.
Sampling Results
The EPA regulates just under 100 contaminants. EWEB tests for over 250 to make sure we are being proactive about emerging threats. In all our sampling, we have not detected levels of concern in the Willamette for any of the tested contaminants, including pesticides, pharmaceuticals, and PFAS, among many others.
The sources are also similar in mineral content. Comparison to non-mandatory EPA standards for sulfate and chloride shows how naturally low both sources are in parameters that can impart a salty taste.
One difference between the two sources is the Willamette has a higher average of Total Organic Carbon. This will be a consideration in the design of the treatment system.
Quick Facts
How will the treatment processes at the two plants differ?
The treatment processes will be largely the same, but the Willamette Plant will incorporate additional technologies such as Ozone Treatment. This will give the new plant greater flexibility in treating fluctuations in organic material.
When will water from the new plant be introduced to the system?
Planning and building a water treatment plant is a long process. Right now, EWEB estimates that water from the new Willamette Treatment Plant will be introduced to the system around 2029.
How will the treated water from the two plants compare?
Water produced by both plants will have the same pH and level of chlorine residual:
- pH: 7.9 pH units
- Chlorine residual: 0.7 mg/L
I am an owner of a water-centric business. Do I need to do anything to prepare?
No. Water from the new Willamette Treatment Plant should be very similar to what you are using currently. A summary of water samples gathered from both rivers over 10 years show the source waters are similar in composition. Slight variances are expected to be managed with treatment.
