San Juan Municipio, PR
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 Municipio in Puerto Rico · Population: 338,661
TRI sites such as Prepa - San Juan Steam Plant; Suiza Dairy Corp; Max Chemical Inc anchor San Juan Municipio, PR's EPA extract. Derived burden score 23/100 (Low Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Prepa - San Juan Steam Plant; Suiza Dairy Corp; Max Chemical Inc are among the largest Form R filers reporting in San Juan Municipio; no SDWIS system here carries an active health-based flag. AQS median AQI 7 / peak 10 in 2021.
Burden score 23/100 (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 Municipio -- 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 San Juan Municipio, PR: EPA TRI 2023 reporting year
Same facilities, both years
-33.4%
6 facilities that filed in 2022 and 2023
Whole inventory
-33.4%
118.8 thousand lb → 79.2 thousand lb, every facility that filed
- San Juan Municipio, PR's total reported releases fell from 118.8 thousand lb in 2022 to 79.2 thousand lb in 2023, based on EPA TRI filings.
- San Juan Municipio, PR's off-site transfers rose from 1.7 thousand lb in 2022 to 4.3 thousand lb in 2023, based on EPA TRI filings.
- San Juan Municipio, PR's air releases fell from 117.1 thousand lb in 2022 to 74.8 thousand lb in 2023, based on EPA TRI filings.
- San Juan Municipio, PR's chemicals reported rose from 13 in 2022 to 14 in 2023, based on EPA TRI filings.
Air Quality History (2020–2021)
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 |
|---|---|---|---|---|
| 2021 | 41 (100%) | 0 | 0 | 10 |
| 2020 | 216 (100%) | 0 | 0 | 39 |
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 Puerto Rico, see the EPA's AirNow.gov.
TRI Facilities (7)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Prepa - San Juan Steam Plant | 436.1K lbs |
| 2 | Suiza Dairy Corp | 55.5K lbs |
| 3 | Max Chemical Inc | 20 lbs |
| 4 | US Dod Usaf Puerto Rico Ang | 8 lbs |
| 5 | Puerto Rico Wood Treating | 0 lbs |
| 6 | Indulac | 0 lbs |
| 7 | Gulf Treating Corp | 0 lbs |
Cities in San Juan Municipio (4)
Frequently Asked Questions
What is the environmental risk level in San Juan Municipio, Puerto Rico? ▼
Are there Superfund sites in San Juan Municipio? ▼
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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.