Portland’s drinking water comes from Portland Water Bureau (EPA system OR4100657), which draws surface water from a river, lake or reservoir and treats it before distribution for about 666,200 people. EPA’s records associate 5 sizeable community systems with Portland; Portland Water Bureau is the main one, and it is the system this page examines in depth. This page translates that system’s official EPA record — lead and copper results, violation history, and what the data does and does not say — into plain English.
This page is built entirely from the U.S. EPA’s Safe Drinking Water Information System (SDWIS), the same records state regulators use. We did not test Portland’s water, and system-level data describes the utility’s water as a whole — not what comes out of one specific home’s tap. Where the record is silent, we say so rather than guess.
Key takeaways
- Portland Water Bureau supplies Portland (Surface water); it serves about 666,200 people across its service area.
- Portland Water Bureau’s most recent reported 90th-percentile lead result is 5.01 ppb, below the EPA action level of 15 ppb.
- 1 health-based violation in the last 10 years — details below, with dates and current status.
- EPA does not track hardness. If you’re shopping for a softener, test first and size from a real grains-per-gallon number.
The water system serving Portland
Portland Water Bureau is the community water system the EPA associates with Portland, Oregon. It reports a population served of about 666,200.
| System | EPA ID | People served | Source water | Role |
|---|---|---|---|---|
| Portland Water Bureau | OR4100657 | 666,200 | Surface water | Main system |
| Rockwood Pud | OR4100668 | 65,443 | Purchased surface water | Also serves the area |
| West Slope Water District | OR4100660 | 11,000 | Purchased surface water | Also serves the area |
| Raleigh Water District | OR4100667 | 4,500 | Purchased surface water | Also serves the area |
| Palatine Hill Water District | OR4100653 | 1,500 | Purchased surface water | Also serves the area |
EPA’s records associate 16 further systems with the Portland area beyond the ones above — neighbourhood districts, subdivisions and mobile-home parks among them. If your water bill names a different system, that name — not the city name — is the record to check.
Not sure which system serves your address? Run your ZIP code through our What’s In My Water? lookup — it resolves the systems EPA lists for your ZIP and shows the same records in full.
Lead and copper
Lead: Portland Water Bureau’s most recent reported 90th-percentile lead result is 5.01 ppb, below the EPA action level of 15 ppb.
Read those numbers carefully: a 90th percentile is a system-wide statistic from a sample of homes, not a test of your tap. Lead in drinking water comes mostly from a home’s own plumbing — service lines, solder and fixtures — so two houses on the same street can test very differently. Homes built before 1986 carry the highest risk, whatever the system average says.
Violation history — the last 10 years
EPA records show 1 health-based violation for Portland Water Bureau in the last 10 years. Health-based means the serious kind — here is what it was:
- a regulated contaminant (EPA code 0800) — a required treatment technique step was not followed. Began December 2017; still open in EPA’s record.
Separately, EPA lists 1 monitoring/reporting item for this system in the last 5 years — missed or late tests and paperwork. Those are compliance-process findings, not contamination findings, and we keep them in their own bucket on purpose.
What this means for your home
System data sets the background; your home’s plumbing writes the foreground. In practice:
- Lead deserves action here. A system 90th percentile of 5.01 ppb means sampled homes in this system do pick up lead. If your home predates 1986, a filter certified to NSF/ANSI 53 for lead — or a reverse osmosis system (NSF/ANSI 58) — is the standard fix; see our water filter guides and certified filter picks for what the certifications actually cover.
- Taste and smell: surface-water systems disinfect with chlorine or chloramine, which is most of what people taste. A basic carbon filter (NSF/ANSI 42) handles it; our chloramine vs chlorine explainer helps you tell which one your water has.
- Hardness is not in this record — by design. The EPA doesn’t track it, so nobody can honestly tell you your grains-per-gallon from this page. Scale on fixtures and shower doors is a hint, not a measurement. Test (strips are a start; a lab test is better — see how to test your water at home), then size any softener with our softener sizing calculator and the softener hub.
- On a private well instead of city water? None of this system’s record applies to your tap — start with our well water hub for the test-first approach.
Water quality in nearby cities
New York, NY · Los Angeles, CA · Houston, TX
This guide is one of our per-city water reports — see the full list on the Water Quality hub, alongside our contaminant explainers and testing guides.
Frequently asked questions
Is Portland water safe to drink?
The honest answer is: largely yes today, with real entries on its record. Portland Water Bureau has 1 health-based violation in the last 10 years (detailed in the violation section above); 1 of them is still open in EPA’s record. A returned-to-compliance violation is history, not a current failure — and for lead, {lead_clause}. EPA data describes the system as a whole, not your tap; lead usually comes from a home’s own plumbing, so a certified home test is the only way to know your exact water.
Where does Portland get its drinking water?
Portland Water Bureau is the community water system the EPA associates with Portland. It draws surface water from a river, lake or reservoir and treats it before distribution and serves about 666,200 people across its service area (EPA system ID OR4100657). 4 other sizeable systems also report serving parts of Portland — they are listed in the table above.
What is the lead level in Portland’s water?
Portland Water Bureau’s most recent reported 90th-percentile lead result is 5.01 ppb, below the EPA action level of 15 ppb. That figure is a system statistic from sampled homes, not a test of your tap — your own plumbing decides your exposure, and a certified home test is the only way to know it.
Has Portland’s water system had violations?
Yes — 1 health-based violation in the last 10 years, listed with dates and status in the violation section above. Any that are still open are marked as such.
Do I need a water filter in Portland?
The clearest reason to filter in Portland is lead from home plumbing, given the system’s 90th-percentile result. A filter certified to NSF/ANSI 53 for lead (or reverse osmosis, NSF/ANSI 58) is the standard answer. For everything else, match the tool to a measured problem — hardness included — rather than buying for a list of fears.
Source: U.S. EPA SDWIS via Envirofacts, retrieved November 11, 2026. System-level data describes the utility’s water, not any individual tap. If your water bill names a different system, that system’s record is the one that applies to you.