TRI Facilities
135
Moderate
ID · EPA TRI · SDWIS · Superfund
Idaho environmental disclosure record
According to EPA's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List extracts, this is Idaho's full public registry profile, toxic releases, drinking-water systems, and Superfund sites in one place.
- TRI facilities
- 135
- Reported releases
- 200.0M lbs
- #24 of 56
- Water systems
- 773
- Superfund NPL sites
- 12
Idaho vs. every U.S. state
Cumulative TRI-reported release pounds, with this state marked in the national distribution
200M lbs Top 43% higher than 57% of 56 states with TRI reporters
Each bar is a $1M-wide band; taller bars hold more states with TRI reporters. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
ID regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
- RCRA · Subtitle C 12
What this shows Counts are mapped to statute as a structural proxy and reflect reported activity, not toxicity-weighted or population-adjusted risk. Clean Air Act (Title V) permit data is not currently ingested by this portal, so air-permit compliance is not shown here.
How Idaho compares across two EPA disclosure measures
The highlighted point is Idaho. The vertical axis is the share of tracked water systems with at least one health-based SDWIS record; the horizontal axis is TRI-reported pounds per facility on a logarithmic scale so the full state distribution stays readable. The crosshairs use the portal’s published national benchmark medians.
This matrix compares disclosure rates, not toxicity, exposure, current compliance, or drinking-water safety. A lower position on either axis is not a safety rating; use the underlying facility and water-system records for context.
According to EPA TRI, SDWIS, and Superfund NPL extracts, Idaho (ID) lists 135 TRI-reporting facilities disclosing 200.0M lbs of toxic releases. The same extracts list 12 Superfund sites and 773 EPA-regulated water systems, of which 313 carry health-based SDWIS violation rows. PlainEnviro's composite environmental health score for Idaho is 40/100 (grade F), benchmarked against all U.S. states on chemical release intensity, drinking-water health violations, Superfund site burden, and water violation rate. This is a percentile-derived composite from federal disclosure counts, not a clinical health-risk assessment.
F 40
Idaho Environmental Health Score
A percentile-benchmarked 0–100 composite from 4 EPA federal datasets, with weight redistribution for any unavailable dimension
Chemical Release Intensity F 34
1.5M (lbs per facility) Drinking Water Health Violations F 49
40.5% (% of systems) Superfund Site Burden F 13
8.9 (sites per 100 facilities) Water Violation Rate D 60
3.0 (violations per system) Benchmarks derived from EPA TRI, SDWIS, and Superfund NPL extracts across all 56 U.S. states and territories
Water Systems
773
Moderate
Superfund Sites
12
Moderate
Total Releases
200.0M lbs
Very high
Compliance Snapshot - ID
Sites with no recorded health violations 65.5%
Sites with at least one open violation 34.5%
Idaho's profile joins three independently maintained EPA programs into one statewide record: the Toxics Release Inventory (TRI, EPCRA Section 313 industrial disclosures), the Safe Drinking Water Information System (SDWIS, Safe Drinking Water Act compliance), and the Superfund National Priorities List. Each program uses its own reporting cadence and facility-identification scheme; PlainEnviro joins them by matched facility and system location rather than a shared federal ID, so a site absent from one program is never assumed absent from another. The counts below reflect the portal's rebuild as of August 2026.
Activity clusters in counties such as Kootenai, Canyon, Ada, which account for the highest combined facility, water-system, and Superfund presence. Monitoring and reporting violations are not included in the SDWIS counts shown here.
Every figure reflects the public regulatory record as filed with the U.S. Environmental Protection Agency and is not weighted for toxicity, geographic footprint, or population exposure. A state can rank high in any individual metric because of industrial history, naturally occurring contaminants in source water, or simply the number of reporting facilities, not because current residents face unsafe conditions. Drill into any county or water system below for the full disclosure record.
What does this state's environmental record show?
TRI Facilities
135
Water Systems
773
Superfund Sites
12
Health-Based Violation Records
2,331
Total Releases
200.0M lbs
cumulative, all reported years
Systems with Records
313
water systems
Release-over-release change
What changed for Idaho: EPA TRI 2023 reporting year
Same facilities, both years
+1.0%
122 facilities that filed in 2022 and 2023
Whole inventory
+1.0%
42.9 million lb → 43.4 million lb, every facility that filed
Between the two reporting years, 5 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Idaho's total reported releases rose from 42.9 million lb in 2022 to 43.3 million lb in 2023, based on EPA TRI filings.
- Idaho's water releases rose from 3.8 million lb in 2022 to 5.0 million lb in 2023, based on EPA TRI filings.
- Idaho's off-site transfers fell from 1.5 million lb in 2022 to 1.3 million lb in 2023, based on EPA TRI filings.
- Idaho's chemicals reported rose from 114 in 2022 to 118 in 2023, based on EPA TRI filings.
Largest Polluters
View all →Water Quality
Systems with Health Violations
| Water System | Population | Violations |
|---|---|---|
| MISSION CREEK WATER ASSN | 263 | 203 |
| ELK CITY WATER AND SEWER ASSN | 320 | 114 |
| MEADOW LARK COURT LLC | 45 | 89 |
| JULIAETTA CITY OF | 624 | 81 |
| CLEARWATER WATER DIST | 80 | 69 |
| DRAKE SUBD | 150 | 62 |
| CEDAR SPRINGS COMMUNITY WATER | 130 | 60 |
| BIA NORTH IDAHO | 490 | 49 |
| MCCALL CITY OF | 4,423 | 36 |
| ASPEN RIDGE SUBD | 204 | 35 |
| KING HILL DOMESTIC WATER AND SEWER | 87 | 34 |
| FRUITLAND CITY OF | 7,458 | 31 |
| FERNAN ESTATES CORPORATION | 37 | 29 |
| RED ROCK WATER LLC | 60 | 29 |
| INDIAN VILLAGE | 225 | 29 |
| SHOTGUN CHEROKEE SUBD 5 | 245 | 28 |
| CASTLE MOUNTAIN CREEKS OWNERS ASSN | 250 | 27 |
| NEW HOPE SUBD | 100 | 25 |
| FILER WATER WORKS | 2,858 | 23 |
| RAMSEY ESTATES | 88 | 22 |
Cities with Water Issues
Boise
48 water systems
Nampa
42 water systems
Rathdrum
26 water systems
Idaho Falls
25 water systems
Sandpoint
23 water systems
Caldwell
22 water systems
Athol
19 water systems
Eagle
17 water systems
Pocatello
15 water systems
Blackfoot
13 water systems
Hayden
13 water systems
Mountain Home
13 water systems
Post Falls
12 water systems
Coeur D Alene
12 water systems
Bonners Ferry
11 water systems
Preston
11 water systems
Rigby
11 water systems
Ketchum
10 water systems
Lewiston
9 water systems
Meridian
9 water systems
Superfund Sites (12)
| Site Name | Status | HRS Score |
|---|---|---|
| Arrcom (Drexler Enterprises) | Deleted NPL Site | 29.28 |
| Blackbird Mine | Proposed NPL Site | 50.00 |
| Bunker Hill Mining & Metallurgical Complex | NPL Site | 54.76 |
| Eastern Michaud Flats Contamination | NPL Site | 57.80 |
| Idaho National Engineering Laboratory (USDOE) | NPL Site | 51.91 |
| Kerr-McGee Chemical Corp. (Soda Springs Plant) | NPL Site | 51.91 |
| Monsanto Chemical Co. (Soda Springs Plant) | NPL Site | 54.77 |
| Mountain Home Air Force Base | NPL Site | 57.80 |
| Pacific Hide & Fur Recycling Co. | Deleted NPL Site | 42.30 |
| St. Maries Creosote | Proposed NPL Site | 50.00 |
| Stibnite/Yellow Pine Mining Area | Proposed NPL Site | 50.00 |
| Union Pacific Railroad Co. | Deleted NPL Site | 53.47 |
Counties (46 total)
| County | Facilities |
|---|---|
| Kootenai | 9 |
| Canyon | 23 |
| Ada | 15 |
| Bonner | 4 |
| Bonneville | 8 |
| Nez Perce | 12 |
| Bingham | 4 |
| Blaine | 1 |
| Twin Falls | 7 |
| Elmore | 2 |
| Bannock | 1 |
| Idaho | 1 |
| Shoshone | 5 |
| Franklin | 0 |
| Benewah | 3 |
| Latah | 2 |
| Cassia | 4 |
| Boundary | 1 |
| Jefferson | 0 |
| Jerome | 6 |
Showing top 20 counties by environmental activity. Idaho has 46 counties total.
Cities with Environmental Records
Lewiston
12 facilities · 9 water systems
Nampa
11 facilities · 42 water systems
Caldwell
11 facilities · 22 water systems
Boise
10 facilities · 48 water systems
Idaho Falls
8 facilities · 25 water systems
Twin Falls
7 facilities · 3 water systems
Post Falls
6 facilities · 12 water systems
Jerome
6 facilities · 5 water systems
Blackfoot
4 facilities · 13 water systems
Burley
4 facilities · 6 water systems
Pocatello
3 facilities · 15 water systems
Meridian
3 facilities · 9 water systems
Soda Springs
2 facilities · 4 water systems
Wallace
2 facilities · 3 water systems
Gooding
2 facilities · 2 water systems
Kellogg
2 facilities · 2 water systems
Mountain Home Afb
2 facilities · 1 water systems
Saint Maries
2 facilities · 0 water systems
Rathdrum
1 facilities · 26 water systems
Athol
1 facilities · 19 water systems
Frequently Asked Questions
How many TRI facilities are in Idaho? ▼
Idaho has 135 facilities that report to the EPA Toxic Release Inventory (TRI). These facilities have collectively reported 200.0M lbs in total toxic chemical releases. TRI data is self-reported annually by facilities that manufacture, process, or use listed toxic chemicals above threshold amounts.
Does Idaho have Superfund sites? ▼
Yes, Idaho has 12 sites on the EPA Superfund National Priorities List (NPL). Superfund sites are contaminated locations identified for long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
What does EPA SDWIS list for drinking water in Idaho? ▼
Idaho has 773 EPA-regulated water systems in the Safe Drinking Water Information System (SDWIS) extract used here. 313 water systems have a health-based violation row (MCL exceedance) in this historical extract. A past registry row is not a current drinkability verdict. For current utility conditions, contact the local water utility or the Idaho drinking water program. Source: EPA SDWIS.
What environmental data is available for Idaho? ▼
PlainEnviro provides three categories of EPA environmental data for Idaho: Toxic Release Inventory (TRI) data covering 135 industrial facilities, Safe Drinking Water Information System (SDWIS) data for 773 water systems, and Superfund National Priorities List (NPL) data for 12 contaminated sites.
How does Idaho compare to other states on EPA disclosure counts? ▼
Idaho has 135 TRI facilities with 200.0M lbs in total releases, 12 Superfund sites, and 2,331 water system violations on record. These are federal disclosure counts; they are not toxicity-weighted or population-adjusted risk scores. Source: EPA TRI, SDWIS, and Superfund NPL databases.
What is Idaho's environmental health score? ▼
PlainEnviro's composite environmental health score for Idaho is 40/100 (grade F). This score combines four percentile-benchmarked dimensions from EPA federal extracts: chemical release intensity per TRI facility, drinking-water health violation rate from SDWIS, Superfund site burden relative to industrial activity, and overall water violation rate. Scores are benchmarked against all 56 U.S. states and territories. When a dimension lacks data, its weight redistributes to the remaining dimensions so the score never deflates from missing inputs. This is a registry-count composite, not a clinical exposure or health-outcome assessment.
Explore More Data for Idaho
TRI Facilities in Idaho →
Every toxic-release facility reporting in the state, ranked by volume
Drinking Water Systems in Idaho →
Community water systems and their violation records
Air Quality in Idaho →
County-level AQI from EPA monitoring stations
Compare states by burden →
EJ screening scores for every U.S. county
State environmental rankings →
How states compare on releases, water and Superfund
Browse all states →
Environmental profiles for every U.S. state
About This Data
This page aggregates environmental data from three EPA programs for Idaho: the Toxic Release Inventory (TRI) for industrial chemical releases, the Safe Drinking Water Information System (SDWIS) for water quality, and the Superfund National Priorities List (NPL) for hazardous waste cleanup sites.
PlainEnviro presents this data without advocacy framing. Numbers reflect reported data and may not capture all environmental activity. For specific health or environmental concerns, contact your state environmental agency.
What to do with Idaho's data
Use this state profile as a starting point, then drill into the specific dataset that matters to you.
- Check the 135 TRI facilities reporting in Idaho for the largest reported releases near a specific county. View facilities
- 313 water systems in the state have a recorded health-based violation, check if yours is one of them. Check water systems
- See how Idaho compares to other states on releases, water violations, and Superfund sites. State rankings
Reported data reflects what facilities and agencies disclose to the EPA; it is not a complete measure of environmental risk or a substitute for local guidance.
Use and verify this record
Idaho's profile brings together EPA release, drinking-water, and Superfund records. It reports the underlying programs without making a health or environmental-risk determination.
State environmental figures are computed directly from EPA data. The methodology records the joins, definitions, and refresh cadence for each program.
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.