Owyhee, ID
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 Owyhee in Idaho · Population: 12,284
TRI sites such as US Ecology Idaho Inc.; Homedale Beam & Deck Plant; Amvac Chemical; SDWIS systems such as HOMEDALE CITY OF; MARSING CITY OF; MELBA CITY OF anchor Owyhee, ID's EPA extract. Derived burden score 39/100 (Moderate 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 Owyhee include GRAND VIEW, CITY OF; BRUNEAU WATER AND SEWER DIST; SIMPLOT LIVESTOCK COMPANY GRANDVIEW, while US Ecology Idaho Inc. leads reported TRI pounds among local Form R filers. No AQS county monitors report here.
Burden score 39/100 (Moderate 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 Owyhee -- 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 Owyhee, ID: EPA TRI 2023 reporting year
Same facilities, both years
+40.1%
3 facilities that filed in 2022 and 2023
Whole inventory
+40.1%
2.8 million lb → 3.9 million lb, every facility that filed
- Owyhee, ID's total reported releases rose from 2.8 million lb in 2022 to 3.9 million lb in 2023, based on EPA TRI filings.
- Owyhee, ID's off-site transfers rose from 6.4 thousand lb in 2022 to 102.9 thousand lb in 2023, based on EPA TRI filings.
- Owyhee, ID's air releases rose from 508 lb in 2022 to 838 lb in 2023, based on EPA TRI filings.
- Owyhee, ID's land releases rose from 2.8 million lb in 2022 to 3.8 million lb in 2023, based on EPA TRI filings.
Water Systems (9)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| HOMEDALE CITY OF | 3,300 | 0 |
| MARSING CITY OF | 1,300 | 0 |
| MELBA CITY OF | 648 | 0 |
| GRAND VIEW, CITY OF | 452 | 4 |
| BRUNEAU WATER AND SEWER DIST | 220 | 6 |
| SIMPLOT LIVESTOCK COMPANY GRANDVIEW | 100 | 1 |
| HOPE HOUSE (OWYHEE) | 78 | 4 |
| MURPHY WATER SYSTEM | 75 | 0 |
| MOUNTAIN VILLAGE | 60 | 0 |
TRI Facilities (3)
| # | Facility | Total Releases |
|---|---|---|
| 1 | US Ecology Idaho Inc. | 10.2M lbs |
| 2 | Homedale Beam & Deck Plant | 1.2K lbs |
| 3 | Amvac Chemical | 1.2K lbs |
Cities in Owyhee (6)
Frequently Asked Questions
What is the environmental risk level in Owyhee, Idaho? ▼
Are there Superfund sites in Owyhee? ▼
How many toxic release facilities are in Owyhee? ▼
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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.