San Juan, CO
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 San Juan in Colorado · Population: 690
SDWIS systems such as SILVERTON TOWN OF; NPL sites such as Bonita Peak Mining District anchor San Juan, CO's EPA extract. Derived burden score 8/100 (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 San Juan in this extract; water coverage still lists SILVERTON TOWN OF. AQS monitors logged median AQI 9 / peak 51 in 2024.
Burden score 8/100 (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 San Juan -- 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 | 120 (99%) | 1 | 0 | 51 |
| 2023 | 120 (100%) | 0 | 0 | 50 |
| 2022 | 115 (97%) | 4 | 0 | 75 |
| 2021 | 114 (96%) | 5 | 0 | 79 |
| 2020 | 115 (97%) | 4 | 0 | 73 |
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 Colorado, see the EPA's AirNow.gov.
Water Systems (1)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SILVERTON TOWN OF | 2,387 | 1 |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Bonita Peak Mining District | NPL Site | 50.00 |
Cities in San Juan (2)
Frequently Asked Questions
What is the environmental risk level in San Juan, Colorado? ▼
Are there Superfund sites in San Juan? ▼
How many toxic release facilities are in San Juan? ▼
What is the air quality in San Juan? ▼
Is the drinking water safe in San Juan? ▼
What environmental agencies cover San Juan? ▼
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.