Nez Perce, 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 Nez Perce in Idaho · Population: 42,477
TRI sites such as Clearwater Paper Corp-Ppd & Cpd Idaho; Federal Cartridge Co-Cci; P Kay Metal Lewiston; SDWIS systems such as LEWISTON ORCHARDS IRRIGATION DIST; LEWISTON CITY OF; JULIAETTA CITY OF anchor Nez Perce, ID's EPA extract. Derived burden score 53/100 (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 Nez Perce include JULIAETTA CITY OF; BIA NORTH IDAHO; RED PHEASANT WATER COMPANY LLC, while Clearwater Paper Corp-Ppd & Cpd Idaho leads reported TRI pounds among local Form R filers. AQS median AQI 29 / peak 182 in 2024.
Burden score 53/100 (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 Nez Perce -- 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 Nez Perce, ID: EPA TRI 2023 reporting year
Same facilities, both years
-11.0%
12 facilities that filed in 2022 and 2023
Whole inventory
-11.0%
1.8 million lb → 1.6 million lb, every facility that filed
- Nez Perce, ID's total reported releases fell from 1.8 million lb in 2022 to 1.6 million lb in 2023, based on EPA TRI filings.
- Nez Perce, ID's water releases fell from 114.8 thousand lb in 2022 to 66.8 thousand lb in 2023, based on EPA TRI filings.
- Nez Perce, ID's off-site transfers fell from 673.5 thousand lb in 2022 to 585.8 thousand lb in 2023, based on EPA TRI filings.
- Nez Perce, ID's air releases fell from 972.4 thousand lb in 2022 to 914.5 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 | 276 (75%) | 82 | 7 | 182 |
| 2023 | 256 (70%) | 106 | 2 | 199 |
| 2022 | 252 (69%) | 107 | 2 | 195 |
| 2021 | 251 (69%) | 96 | 15 | 204 |
| 2020 | 279 (76%) | 76 | 4 | 475 |
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 (22)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| LEWISTON ORCHARDS IRRIGATION DIST | 20,000 | 0 |
| LEWISTON CITY OF | 15,001 | 0 |
| JULIAETTA CITY OF | 624 | 81 |
| BIA NORTH IDAHO | 490 | 49 |
| RED PHEASANT WATER COMPANY LLC | 480 | 2 |
| WINCHESTER WATER DEPT | 400 | 0 |
| CULDESAC CITY OF | 382 | 0 |
| LAPWAI CITY OF | 325 | 0 |
| SOUTH LAPWAI | 235 | 0 |
| PECK WATER SYSTEM | 210 | 0 |
| KAMIAH | 200 | 1 |
| COUGAR RIDGE WATER & SEWER | 173 | 0 |
| NORTH LAPWAI | 110 | 1 |
| EAGLES POINTE SUBDIVISION | 110 | 0 |
| NEW HOPE SUBD | 100 | 25 |
| WAHA GLEN WATER DIST | 100 | 0 |
| EATON MOBILE HOME COURT | 94 | 14 |
| HOO DOO HARVARD WATER AND SEWER DIST | 82 | 5 |
| REUBENS CITY OF | 70 | 11 |
| RED ROCK WATER LLC | 60 | 29 |
| VIEW POINT SUBDIVISION | 56 | 2 |
| SUNNYSIDE PARK | 40 | 5 |
TRI Facilities (12)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Clearwater Paper Corp-Ppd & Cpd Idaho | 6.1M lbs |
| 2 | Federal Cartridge Co-Cci | 1.6M lbs |
| 3 | P Kay Metal Lewiston | 891.9K lbs |
| 4 | Federal Cartridge Co-Southport | 619.0K lbs |
| 5 | Idaho Forest Group-Lewiston | 251.5K lbs |
| 6 | Freedom Munitions LLC | 8.8K lbs |
| 7 | Coleman Oil Co | 8.0K lbs |
| 8 | Freedom Munitions LLC | 4.3K lbs |
| 9 | Federal Cartridge Co-Speer | 1.6K lbs |
| 10 | Poe Asphalt Paving Inc. | 151 lbs |
| 11 | Schweitzer Engineering Labs Inc-Lewiston Id Facility | 104 lbs |
| 12 | Poe Asphalt Paving Inc | 54 lbs |
Cities in Nez Perce (9)
Frequently Asked Questions
What is the environmental risk level in Nez Perce, Idaho? ▼
Are there Superfund sites in Nez Perce? ▼
How many toxic release facilities are in Nez Perce? ▼
What is the air quality in Nez Perce? ▼
Is the drinking water safe in Nez Perce? ▼
What environmental agencies cover Nez Perce? ▼
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.