Water in Oregon.
Portland's Bull Run watershed is one of the highest-quality unfiltered municipal sources in the U.S. The state's 2017 statewide lead-in-school-water testing program found widespread fixture-level exposure that didn't show up in utility-level reports.
How Oregon regulates drinking water.
Federal SDWA primacy. Statewide lead-in-school-water testing program operational since 2017. No state MCLs stricter than federal.
Oregon Health Authority — Drinking Water Services
Oregon's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2016
Portland Public Schools lead exposure scandal triggers statewide testing.
- 2017
Oregon launches statewide school lead-in-water testing program.
- 2024
Federal LCRI replaces lead service lines mandate aligns with existing Oregon work.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Oregon's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- reservoirBull Run Watershed
Portland's pristine unfiltered supply.
- riverMcKenzie River
Eugene.
- riverWillamette River
Salem, mid-valley.
- aquiferCrystalline Bedrock Aquifers
Coast Range, eastern OR.
Source-water mix
~75% surface water, ~25% groundwater
Major cities served
Portland · Eugene · Salem · Gresham · Hillsboro
Who actually serves the water.
The largest public water systems in Oregon by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Portland Water BureauPortland1,000Kserved
- Eugene Water and Electric BoardEugene200Kserved
- Salem Public WorksSalem190Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Oregon's drinking water systems.
Hanford Site groundwater plume (across the Columbia from Tri-Cities WA) affects Oregon shoreline communities. Hillsboro / Beaverton Silicon Forest semiconductor industry adds 1,4-dioxane and chlorinated solvents. Limited PFAS contamination documented relative to peers.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Risk isn't evenly distributed.
School-age children in pre-1986 school buildings face the most-documented lead exposure. Rural well users face arsenic.
~20% on private wells. Rural Coast Range has the most documented arsenic.
What's coming for Oregon's water.
Wildfire burn-scar runoff (2020 Labor Day fires, Bootleg 2021) threatens Bull Run + Cascade watersheds. Snowpack decline affects summer river supply. Coastal saltwater intrusion in shallow Pacific coastal wells.
Statewide mandate
OR Healthy and Safe Schools Plan (2017) requires lead testing in all public schools every six years. Results published.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Oregon specifically.
- 1
Has my Portland system been impacted by Bull Run watershed wildfire?
- 2
Has my school posted current Healthy and Safe Schools Plan lead results?
- 3
If I'm in Washington County, has my well been tested for 1,4-dioxane?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
What's changed in Oregon water law.
Drinking water regulation moves at the state level as much as the federal level. Below are notable recent bills and regulatory actions specific to Oregon.
- 2017
Healthy and Safe Schools Plan — Lead Testing mandate.
For lead: NSF/ANSI 53. For rural private-well arsenic: NSF/ANSI 58 RO.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Oregon