Canyon, ID
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Canyon in Idaho · Population: 242,405
Canyon, ID is tracked across three EPA datasets covering 23 Toxics Release Inventory (TRI) facilities, 70 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 52/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 5.6M lbs of reported toxic releases under EPCRA Section 313, while 29 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 36 and a peak AQI of 183 in 2024, with 68% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 | 248 (68%) | 103 | 9 | 183 |
| 2023 | 268 (74%) | 96 | 0 | 88 |
| 2022 | 189 (52%) | 167 | 7 | 155 |
| 2021 | 209 (57%) | 147 | 5 | 172 |
| 2020 | 210 (57%) | 140 | 10 | 158 |
Source: EPA Air Quality System (AQS) Annual AQI by County 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 (70)
| System | Population | Violations |
|---|---|---|
| NAMPA CITY OF | 100,200 | 0 |
| MIDDLETON CITY OF | 13,190 | 0 |
| PARMA CITY OF | 2,250 | 0 |
| WILDER CITY OF | 1,690 | 1 |
| CALDWELL HOUSING AUTHORITY | 1,100 | 0 |
| GREENLEAF CITY OF | 846 | 0 |
| NOTUS CITY OF | 539 | 0 |
| BELLE AIRE ACRES 2 | 350 | 0 |
| LANSING MEADOWS | 320 | 2 |
| EL RANCHO HEIGHTS | 300 | 0 |
| EVERGREEN MOBILE PARK | 284 | 5 |
| ROLLING HILLS ESTATES WATER COMPANY | 250 | 0 |
| WOODVIEW ACRES PROPERTY OWNERS | 245 | 0 |
| SUNNYRIDGE 3 WATER CORP | 240 | 0 |
| SUNLIGHT TERRACE | 234 | 0 |
| INDIAN VILLAGE | 225 | 26 |
| KARCHER RANCHETTE WATER CORP | 213 | 2 |
| SOMERSET WEST WATER CORP | 203 | 2 |
| OWYHEE VILLAGE SUBD WATER ASSN INC | 200 | 3 |
| LAKEVIEW HILLS WATER USERS ASSOCIATION | 160 | 0 |
| CAMELOT WATER ASSN INC | 157 | 0 |
| CLARK THEURER WATER ASSN | 155 | 3 |
| DRAKE SUBD | 150 | 62 |
| MIDVALE WATER SYSTEM | 144 | 0 |
| OK WATER ASSN | 140 | 0 |
| PAR ESTATES HOMEOWNERS ASSN | 140 | 0 |
| SHAMROCK VILLA WATER ASSN | 130 | 0 |
| GEM STATE ACADEMY | 121 | 6 |
| COUNTRY CLUB SUBDIVISIONS WATER ASSN | 120 | 2 |
| APACHE HEIGHTS SUBDIVISION (2) | 110 | 0 |
| SKY RANCH ESTATES | 104 | 1 |
| KARCHER ACRES SUBD | 100 | 1 |
| LAKEVIEW WATER COMPANY 1 | 100 | 4 |
| PLEASANT VIEW MANOR | 100 | 0 |
| M & T WATER CORP | 100 | 7 |
| NORTHSIDE ESTATES HOA INC | 100 | 0 |
| IDAHO WEST ESTATES | 98 | 0 |
| IDAHO YOUTH RANCH HANDS OF PROMISE | 95 | 21 |
| MAVERICK SUBD LASHER CONSTRUCTION | 90 | 4 |
| ROSWELL WATER USERS COOP COMPANY | 90 | 0 |
| KIMPTON ACRES THIRD SUBD | 88 | 1 |
| WESTVIEW SHERVIK SUBD | 78 | 2 |
| DECOY INN AND RV PARK | 75 | 0 |
| MANGUM HEIGHTS SUBD | 75 | 3 |
| NORTHRIDGE ESTATES WATER ASSN | 75 | 0 |
| D AND S PURPLE SAGE RANCHETTES | 70 | 0 |
| STECHER WATER USERS ASSN | 70 | 0 |
| WEST RIVER | 65 | 0 |
| STECHER MUTUAL WATER COMPANY | 62 | 0 |
| RICH SUBD | 60 | 3 |
| VALLEY VIEW WATER | 57 | 2 |
| BURNIE SUBD | 55 | 0 |
| M AND M MOUNTAIN VIEW SUBD EM2 | 54 | 0 |
| SUNNYRIDGE PROPERTY OWNERS | 53 | 5 |
| DAHL SUBD | 51 | 0 |
| LAKERIDGE SECOND SUBD | 50 | 0 |
| SKYLINE WATER ASSN | 50 | 0 |
| LINDENWOOD WATER ASSN | 48 | 0 |
| VANAL HEIGHTS WELL ASSN | 48 | 7 |
| VANAL HEIGHTS SWEET WATER | 45 | 0 |
| SILVER SPUR SUBDIVISION | 44 | 0 |
| LOCUST SUBD | 42 | 4 |
| SHIPMAN PLACE SUBD | 40 | 1 |
| WILDROSE ESTATES | 40 | 4 |
| SCENIC PROPERTIES WATER ASSN INC | 40 | 0 |
| SUNNYRIDGE I SUBD | 35 | 10 |
| COUNTRY MEADOWS SUBD | 35 | 0 |
| SUNNYRIDGE SUBD 2 | 34 | 0 |
| AURORA SUBD | 30 | 0 |
| TWIN BRIDGES SUBD | 28 | 1 |
TRI Facilities (23)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Amalgamated Sugar Co Nampa | 3.2M lbs |
| 2 | Simplot U.S. Food Group Holdings LLC | 1.4M lbs |
| 3 | Best Bath Systems | 715.2K lbs |
| 4 | Cti Foods - Wilder | 117.6K lbs |
| 5 | Dubois Chemicals Inc. - Nampa Id | 104.9K lbs |
| 6 | Darigold-Caldwell | 59.8K lbs |
| 7 | Sorrento Lactalis Inc. | 29.2K lbs |
| 8 | Icco Middelton | 10.8K lbs |
| 9 | Simplot Western Stockmen's | 7.7K lbs |
| 10 | Big Tex Trailer Manufacturing Inc-Caldwell | 1.4K lbs |
| 11 | 301931-STEPHENS #2 (nampa) | 986 lbs |
| 12 | Performix Nutrition Systems LLC | 969 lbs |
| 13 | Oldcastle Infrastructure & Idaho Sand & Gravel | 200 lbs |
| 14 | Plexus Manufacturing Solutions (boi) | 138 lbs |
| 15 | Idaho Asphalt Supply Inc Nampa Plant | 26 lbs |
| 16 | Dz Grinders LLC | 26 lbs |
| 17 | Hart & Cooley | 22 lbs |
| 18 | Lippert Components Inc.- Plant 84 | 1 lbs |
| 19 | Maddens Ready Mix | 1 lbs |
| 20 | Forterra Structural Specialty Products - Caldwell | 0 lbs |
| 21 | Notus Pit | 0 lbs |
| 22 | Sunroc Corp - Notus Hot Mix Asphalt Plant | 0 lbs |
| 23 | Fleetwood Homes of Idaho Inc #04-1 | 0 lbs |
Cities in Canyon (3)
Frequently Asked Questions
What is the environmental risk level in Canyon, Idaho? ▼
Are there Superfund sites in Canyon? ▼
How many toxic release facilities are in Canyon? ▼
What is the air quality in Canyon? ▼
Is the drinking water safe in Canyon? ▼
What environmental agencies cover Canyon? ▼
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.