Harrison, MS
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 Harrison in Mississippi · Population: 209,443
TRI sites such as Chemours Delisle Plant; Hartson-Kennedy Inc; US Navy Camp Keller Small Arms Range; SDWIS systems such as CITY OF GULFPORT; CITY OF BILOXI; CITY OF LONG BEACH; NPL sites such as Chemfax, Inc. anchor Harrison, MS's EPA extract. Derived burden score 59/100 (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 Harrison include CITY OF GULFPORT; SAUCIER UTILITIES; THE OAKS UTILITIES, while Chemours Delisle Plant leads reported TRI pounds among local Form R filers. AQS median AQI 44 / peak 157 in 2024.
Burden score 59/100 (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 Harrison -- 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 Harrison, MS: EPA TRI 2023 reporting year
Same facilities, both years
-37.4%
12 facilities that filed in 2022 and 2023
Whole inventory
-37.4%
13.4 million lb → 8.4 million lb, every facility that filed
- Harrison, MS's total reported releases fell from 13.4 million lb in 2022 to 8.4 million lb in 2023, based on EPA TRI filings.
- Harrison, MS's off-site transfers rose from 10.2 thousand lb in 2022 to 19.0 thousand lb in 2023, based on EPA TRI filings.
- Harrison, MS's land releases fell from 12.9 million lb in 2022 to 7.9 million lb in 2023, based on EPA TRI filings.
- Harrison, MS's water releases fell from 1.4 thousand lb in 2022 to 1.2 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 | 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 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 (21)
| System | System pop (SDWIS) | 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 |
| NAVAL CONSTRUCTION BATTAL CTR | 3,347 | 0 |
| SAUCIER UTILITIES | 1,853 | 1 |
| SUTTER WATER SERVICE-MAGNOLIA SPRINGS | 1,201 | 0 |
| THE OAKS UTILITIES | 797 | 5 |
| WEST HARRISON WATER & SEWER DISTRICT | 689 | 0 |
| CEDAR LAKE BILOXI, LLC | 422 | 3 |
| 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 |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Chemfax, Inc. | NPL Site | 38.40 |
Cities in Harrison (6)
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.