Boise, 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.
Environmental data for Boise in Idaho · Population: 8,045
SDWIS systems such as HORSESHOE BEND WATER SUPPLY; IDAHO CITY WATER DEPT; SCRIVER WOODS HOMEOWNERS ASSN anchor Boise, ID's EPA extract. Derived burden score 15/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
No TRI Form R facilities sit in Boise in this extract; water coverage still lists HORSESHOE BEND WATER SUPPLY; IDAHO CITY WATER DEPT; SCRIVER WOODS HOMEOWNERS ASSN. AQS monitors logged median AQI 48 / peak 265 in 2024.
Burden score 15/100 (Low 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 Boise -- 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.
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 | 189 (52%) | 128 | 17 | 265 |
| 2023 | 250 (68%) | 115 | 0 | 98 |
| 2022 | 238 (65%) | 123 | 2 | 188 |
| 2021 | 186 (51%) | 167 | 10 | 161 |
| 2020 | 199 (54%) | 155 | 6 | 223 |
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 Idaho, see the EPA's AirNow.gov.
Water Systems (11)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| HORSESHOE BEND WATER SUPPLY | 750 | 0 |
| IDAHO CITY WATER DEPT | 531 | 14 |
| SCRIVER WOODS HOMEOWNERS ASSN | 310 | 0 |
| MOUNTAIN VIEW WATER AND ROAD ASSN | 305 | 6 |
| CASTLE MOUNTAIN CREEKS OWNERS ASSN | 250 | 27 |
| DUQUETTE PINES HOMEOWNERS ASSOCIATION | 163 | 0 |
| VALLEY HI ESTATES | 140 | 0 |
| MOUNTAIN SHADOWS HOA INC. | 89 | 2 |
| GARDEN VALLEY RANCHETTES HOMEOWNERS | 78 | 18 |
| SHILO RANCH ESTATES | 44 | 0 |
| SOUTHFORK LANDING INC | 25 | 0 |
Cities in Boise (3)
Frequently Asked Questions
What is the environmental risk level in Boise, Idaho? ▼
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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.