Multnomah, OR
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for Multnomah in Oregon · Population: 803,863
TRI sites such as Siltronic Corp; Pcc Structurals Inc Large Parts Campus; Onsemi; SDWIS systems such as PORTLAND WATER BUREAU; GRESHAM, CITY OF; ROCKWOOD PUD; NPL sites such as Allied Plating, Inc.; Bradford Island; Gould, Inc. anchor Multnomah, OR's EPA extract. Derived burden score 97/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Multnomah include PORTLAND WATER BUREAU; FAIRVIEW, CITY OF; WASHINGTON COUNTY RAILROAD, while Siltronic Corp leads reported TRI pounds among local Form R filers. AQS median AQI 35 / peak 93 in 2024.
Burden score 97/100 (High Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Multnomah -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Multnomah, OR: EPA TRI 2023 reporting year
Same facilities, both years
-20.8%
57 facilities that filed in 2022 and 2023
Whole inventory
-21.2%
1.3 million lb → 1.0 million lb, every facility that filed
Between the two reporting years, 3 facilities filed for the first time and 5 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Multnomah, OR's total reported releases fell from 1.2 million lb in 2022 to 983.6 thousand lb in 2023, based on EPA TRI filings.
- Multnomah, OR's air releases fell from 520.6 thousand lb in 2022 to 379.0 thousand lb in 2023, based on EPA TRI filings.
- Multnomah, OR's water releases fell from 485.8 thousand lb in 2022 to 393.4 thousand lb in 2023, based on EPA TRI filings.
- Multnomah, OR's off-site transfers fell from 236.1 thousand lb in 2022 to 211.3 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 311 (85%) | 55 | 0 | 93 |
| 2023 | 267 (73%) | 97 | 1 | 117 |
| 2022 | 266 (73%) | 94 | 3 | 165 |
| 2021 | 294 (81%) | 70 | 1 | 105 |
| 2020 | 275 (75%) | 82 | 1 | 779 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Oregon, see the EPA's AirNow.gov.
Water Systems (30)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| PORTLAND WATER BUREAU | 666,200 | 1 |
| GRESHAM, CITY OF | 73,932 | 0 |
| ROCKWOOD PUD | 65,443 | 0 |
| MILWAUKIE, CITY OF | 20,946 | 0 |
| TROUTDALE, CITY OF | 16,185 | 0 |
| FAIRVIEW, CITY OF | 9,963 | 2 |
| WOOD VILLAGE, CITY OF | 4,388 | 0 |
| CORBETT WATER DISTRICT | 2,954 | 0 |
| PLEASANT HOME WATER DISTRICT | 1,510 | 0 |
| LUSTED WATER DISTRICT | 1,200 | 0 |
| WASHINGTON COUNTY RAILROAD | 795 | 1 |
| SHADY OAKS ESTATES | 648 | 14 |
| INTERLACHEN WATER PUD | 360 | 12 |
| SANDY BOULEVARD MOBILE VILLA | 350 | 0 |
| MANNA HOUSE CHURCH | 300 | 2 |
| HIGHLINE OAKS WATER UTILITY | 242 | 8 |
| MONTGOMERY PLACE WATER SYSTEM | 207 | 13 |
| EVERETT SQUARE WINDCREST ESTATES | 204 | 8 |
| ROSE HILL ESTATES SUBDIVISION | 177 | 0 |
| ENCHANTED MOBILE HOME PARK | 150 | 12 |
| ROCKY POINTE MARINA | 125 | 2 |
| Columbia Place LLC | 125 | 0 |
| SEAVEY LOOP WATER COMPANY | 110 | 0 |
| SAUVIE ISLAND MOORAGE | 96 | 1 |
| MCCUDDYS LANDING | 70 | 0 |
| TIMBER CREEK ESTATES | 60 | 1 |
| LATOURELL FALLS TOWNSHIP | 32 | 0 |
| MAYFAIR MOORAGE INC | 30 | 0 |
| BIG OAK MARINA | 30 | 6 |
| ROBBINS NEST RESIDENTIAL PARK | 27 | 2 |
TRI Facilities (50)
Superfund Sites (7)
| Site Name | Status | HRS Score |
|---|---|---|
| Allied Plating, Inc. | Deleted NPL Site | 39.25 |
| Bradford Island | NPL Site | 50.00 |
| Gould, Inc. | Deleted NPL Site | 32.12 |
| Harbor Oil | Deleted NPL Site | 48.00 |
| McCormick & Baxter Creosoting Co. (Portland Plant) | NPL Site | 50.00 |
| Portland Harbor | NPL Site | 50.00 |
| Reynolds Metals Company | NPL Site | 70.71 |
Cities in Multnomah (6)
Frequently Asked Questions
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.