Water quality
Oregon water quality
According to the Oregon Health Authority (OHA), emerging contaminants of concern in the state include cyanotoxins from harmful algal blooms, PFAS, and manganese, with cyanotoxins prompting Salem's 2018 do-not-drink advisory tied to Detroit Lake. OHA also flags naturally occurring arsenic and nitrate as risks, particularly for private wells, and recommends annual testing. Conditions vary widely: Portland reports no PFAS detections.
Documented considerations
Arsenic
According to OHA, naturally occurring arsenic in groundwater is a health risk in parts of Oregon, and the agency recommends private well owners test for arsenic, bacteria, and nitrate annually.
Nitrates
According to OHA, nitrate is among the contaminants threatening some Oregonians' water, especially private wells in agricultural areas, with potential health risks for infants.
PFAS
According to OHA, PFAS are an emerging contaminant of concern statewide; in Portland specifically, the utility reports PFAS have not been detected in either of its water sources.
Certified filters for Oregon's main concerns
- 7.2AquaTru Classic Countertop RO
A no-plumbing countertop 4-stage RO purifier certified to NSF standards for lead, PFAS, fluoride and arsenic with an efficient drain ratio.
- 7.5Culligan US-EZ-4 Under-Sink
An under-sink filter genuinely IAPMO certified to NSF/ANSI 42, 53 and 401 for lead, cysts, VOCs, mercury and PFOA/PFOS.
- 7.2Aquasana AQ-5200 Under-Sink
Certified for lead and PFAS, cheap per gallon, marketing matches the certified scope.
- 4.9ZeroWater 5-Stage Pitcher (7-Cup)
A five-stage ion-exchange pitcher certified for lead, chromium-6 and PFOA/PFOS - but a short 15-gallon filter makes it costly to run.
FAQ
- Is Oregon tap water safe to drink?
- According to OHA, most public systems meet federal standards, but emerging contaminants like cyanotoxins and PFAS are monitored, and naturally occurring arsenic and nitrate pose risks mainly to private wells. Well owners should test annually.
- What happened with Salem's water in 2018?
- According to OHA, cyanotoxins from a harmful algal bloom in Detroit Lake, Salem's primary reservoir, led to a do-not-drink advisory in May 2018; the state later required susceptible surface-water systems to routinely test for cyanotoxins.
- Is there PFAS in Portland's water?
- According to the City of Portland's drinking water quality reporting, PFAS have not been detected in either of Portland's water sources, though OHA tracks PFAS as an emerging concern statewide.
Sources
- Oregon Health Authority - Emerging Contaminants in Drinking Water
- City of Portland - 2025 Drinking Water Quality Report
- EWG Tap Water Database - Oregon
Not sure how to read your local report? See our guide on reading a water quality report.