Canyon, 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 Canyon in Idaho · Population: 242,405
TRI sites such as Amalgamated Sugar Co Nampa; Simplot U.S. Food Group Holdings LLC; Best Bath Systems; SDWIS systems such as NAMPA CITY OF; MIDDLETON CITY OF; PARMA CITY OF anchor Canyon, ID's EPA extract. Derived burden score 52/100 (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 Canyon include WILDER CITY OF; LANSING MEADOWS; EVERGREEN MOBILE PARK, while Amalgamated Sugar Co Nampa leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 183 in 2024.
Burden score 52/100 (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 Canyon -- 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 Canyon, ID: EPA TRI 2023 reporting year
Same facilities, both years
+2.0%
21 facilities that filed in 2022 and 2023
Whole inventory
+0.2%
989.7 thousand lb → 992.1 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Canyon, ID's total reported releases rose from 972.4 thousand lb in 2022 to 992.1 thousand lb in 2023, based on EPA TRI filings.
- Canyon, ID's off-site transfers rose from 31.0 thousand lb in 2022 to 46.0 thousand lb in 2023, based on EPA TRI filings.
- Canyon, ID's chemicals reported fell from 29 in 2022 to 27 in 2023, based on EPA TRI filings.
- Canyon, ID's land releases rose from 215.9 thousand lb in 2022 to 218.6 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 | 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 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 (71)
| System | System pop (SDWIS) | 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 |
| 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 | 1 |
| M & T WATER CORP | 100 | 7 |
| NORTHSIDE ESTATES HOA INC | 100 | 0 |
| IDAHO WEST ESTATES | 98 | 0 |
| EAST LIZARD BUTTE WATER CORP | 95 | 1 |
| 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 |
| HORIZON RIDGE SUBDIVISION | 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 (7)
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.