Multnomah County, Oregon
60 ZIP codes · Avg score 79/100 · Grade B · Updated 2026-06-03
Unlike many counties its size, Multnomah County keeps violation rates low — all 60 ZIP codes score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Multnomah County Compares
How Multnomah County Compares
Multnomah County scores 1 points above the Oregon state average (78/100) and 11 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Multnomah County, Oregon
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11 (asthma 11.7%, diabetes 9.5%)
Estimated additional annual cost per homeowner: $998, driven primarily by wildfire
Infrastructure: 0.33% avg pipe failure probability, 23% of ZIPs at high risk
Violation History (2021–2024)
↑ Worsening trendEPA violation counts by year across Multnomah County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 4 violations. Past 5 years: 10 total (10 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $998
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Multnomah County
Remediation costs are relatively manageable for most homeowners in Multnomah County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Multnomah County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Multnomah County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Portland Water Bureau | 666,200 | 127 |
| 2 | Rockwood Pud | 65,443 | 127 |
| 3 | West Slope Water District | 11,000 | 100 |
| 4 | Raleigh Water District | 4,500 | 100 |
| 5 | Palatine Hill Water District | 1,500 | 100 |
22 total water systems serve Multnomah County.
All ZIP Codes in Multnomah County
60 ZIP codes tracked in Multnomah County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 97201 | Portland | 82 | B | 2 | $648K |
| 2 | 97203 | Portland | 82 | B | 2 | $469K |
| 3 | 97204 | Portland | 82 | B | 2 | — |
| 4 | 97205 | Portland | 82 | B | 2 | $694K |
| 5 | 97209 | Portland | 82 | B | 2 | $574K |
| 6 | 97210 | Portland | 82 | B | 2 | $992K |
| 7 | 97211 | Portland | 82 | B | 2 | $617K |
| 8 | 97212 | Portland | 82 | B | 2 | $825K |
| 9 | 97213 | Portland | 82 | B | 2 | $609K |
| 10 | 97214 | Portland | 82 | B | 2 | $733K |
| 11 | 97215 | Portland | 82 | B | 2 | $659K |
| 12 | 97216 | Portland | 82 | B | 2 | $439K |
| 13 | 97218 | Portland | 82 | B | 2 | $493K |
| 14 | 97220 | Portland | 82 | B | 2 | $428K |
| 15 | 97221 | Portland | 82 | B | 2 | $790K |
| 16 | 97227 | Portland | 82 | B | 2 | $596K |
| 17 | 97228 | Portland | 82 | B | 2 | — |
| 18 | 97230 | Portland | 82 | B | 2 | $436K |
| 19 | 97231 | Portland | 82 | B | 2 | $795K |
| 20 | 97232 | Portland | 82 | B | 2 | $801K |
| 21 | 97233 | Portland | 82 | B | 2 | $385K |
| 22 | 97238 | Portland | 82 | B | 2 | — |
| 23 | 97240 | Portland | 82 | B | 2 | — |
| 24 | 97242 | Portland | 82 | B | 2 | — |
| 25 | 97250 | Portland | 82 | B | 2 | — |
| 26 | 97252 | Portland | 82 | B | 2 | — |
| 27 | 97256 | Portland | 82 | B | 2 | — |
| 28 | 97258 | Portland | 82 | B | 2 | — |
| 29 | 97268 | Portland | 82 | B | 2 | — |
| 30 | 97269 | Portland | 82 | B | 2 | — |
| 31 | 97272 | Portland | 82 | B | 2 | — |
| 32 | 97280 | Portland | 82 | B | 2 | — |
| 33 | 97281 | Portland | 82 | B | 2 | — |
| 34 | 97282 | Portland | 82 | B | 2 | — |
| 35 | 97283 | Portland | 82 | B | 2 | — |
| 36 | 97286 | Portland | 82 | B | 2 | — |
| 37 | 97290 | Portland | 82 | B | 2 | — |
| 38 | 97291 | Portland | 82 | B | 2 | — |
| 39 | 97292 | Portland | 82 | B | 2 | — |
| 40 | 97293 | Portland | 82 | B | 2 | — |
| 41 | 97294 | Portland | 82 | B | 2 | — |
| 42 | 97296 | Portland | 82 | B | 2 | — |
| 43 | 97298 | Portland | 82 | B | 2 | — |
| 44 | 97299 | Portland | 82 | B | 2 | — |
| 45 | 97014 | Cascade Locks | 81 | B | 15 (2 health) | $338K |
| 46 | 97060 | Troutdale | 78 | B | 1 | $426K |
| 47 | 97030 | Gresham | 77 | B | 7 | $418K |
| 48 | 97080 | Gresham | 77 | B | 7 | $485K |
| 49 | 97202 | Portland | 77 | B | 2 | $685K |
| 50 | 97217 | Portland | 77 | B | 2 | $570K |
| 51 | 97219 | Portland | 77 | B | 2 | $652K |
| 52 | 97236 | Portland | 77 | B | 2 | $414K |
| 53 | 97239 | Portland | 77 | B | 2 | $713K |
| 54 | 97266 | Portland | 72 | B | 2 | $421K |
| 55 | 97019 | Corbett | 70 | B | 12 | $666K |
| 56 | 97024 | Fairview | 61 | C | 12 (5 health) | $404K |
| 57 | 97010 | Bridal Veil | 53 | D | 0 | — |
| 58 | 97251 | Us West | 53 | D | 0 | — |
| 59 | 97253 | Us Bank | 53 | D | 0 | — |
| 60 | 97254 | Gen Electric | 53 | D | 0 | — |
Recommended Buyer Guides for Multnomah County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Multnomah County, Oregon
Overview
Multnomah County in Oregon covers 60 ZIP codes with an average Home Safety Score of B (79/100).
56 of 60 ZIP codes have recorded EPA violations. 7 health-based violations have been documented.
← Back to Oregon water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.