Harrison, MS
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Harrison in Mississippi · Population: 209,443
Harrison, MS is tracked across three EPA datasets covering 13 Toxics Release Inventory (TRI) facilities, 22 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 54/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 59.4M lbs of reported toxic releases under EPCRA Section 313, while 6 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 44 and a peak AQI of 157 in 2024, with 66% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 | 239 (66%) | 117 | 4 | 157 |
| 2023 | 166 (46%) | 193 | 2 | 105 |
| 2022 | 211 (58%) | 154 | 0 | 100 |
| 2021 | 221 (62%) | 138 | 0 | 87 |
| 2020 | 179 (51%) | 172 | 1 | 101 |
Source: EPA Air Quality System (AQS) Annual AQI by County 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 Mississippi, see the EPA's AirNow.gov.
Water Systems (22)
| System | Population | Violations |
|---|---|---|
| CITY OF GULFPORT | 75,056 | 1 |
| CITY OF BILOXI | 23,310 | 0 |
| CITY OF LONG BEACH | 18,514 | 0 |
| DIBERVILLE W/S | 12,721 | 0 |
| CITY OF PASS CHRISTIAN | 10,436 | 0 |
| CITY OF BILOXI-NORTH | 9,858 | 0 |
| KEESLER AIR FORCE BASE | 8,006 | 0 |
| CITY OF BILOXI-FRENCH | 4,968 | 0 |
| RIVERBEND UTILITIES INC | 4,834 | 2 |
| NAVAL CONSTRUCTION BATTAL CTR | 3,347 | 0 |
| SAUCIER UTILITIES | 1,853 | 1 |
| SUTTER WATER SERVICE-MAGNOLIA SPRINGS | 1,201 | 0 |
| THE OAKS UTILITIES | 797 | 4 |
| WEST HARRISON WATER & SEWER DISTRICT | 689 | 0 |
| CEDAR LAKE BILOXI, LLC | 422 | 2 |
| HCUA-EAST | 404 | 0 |
| HCUA-WEST | 172 | 0 |
| PINEVILLE PROJECT III SOUTH | 100 | 0 |
| TUXACHANIE ESTATES #2 | 95 | 6 |
| CITY OF BILOXI-MAGNOLIA BEND | 73 | 0 |
| HCUA-TRADITIONS | 0 | 0 |
| HCUA-NORTH | 0 | 0 |
TRI Facilities (13)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Chemours Delisle Plant | 59.0M lbs |
| 2 | Hartson-Kennedy Inc | 279.0K lbs |
| 3 | US Navy Camp Keller Small Arms Range | 142.2K lbs |
| 4 | Ambit Chemical Technologies | 15.6K lbs |
| 5 | US Marine Inc. | 8.3K lbs |
| 6 | Seemann Composites LLC | 3.8K lbs |
| 7 | Gulf Ship LLC | 558 lbs |
| 8 | Soprema Inc | 115 lbs |
| 9 | Mmc Materials Gulf Coast LLC - Gulfport | 2 lbs |
| 10 | Gulf States Ready-Mix Plant 10 | 2 lbs |
| 11 | Bayou Concrete LLC - Biloxi | 0 lbs |
| 12 | Crh Americas Inc | 0 lbs |
| 13 | Waring Oil Co Biloxi | 0 lbs |
Cities in Harrison (3)
Frequently Asked Questions
What is the environmental risk level in Harrison, Mississippi? ▼
Are there Superfund sites in Harrison? ▼
How many toxic release facilities are in Harrison? ▼
What is the air quality in Harrison? ▼
Is the drinking water safe in Harrison? ▼
What environmental agencies cover Harrison? ▼
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.