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Hancock, MS

Moderate Risk (40/100)

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 Hancock in Mississippi · Population: 46,057

TRI sites such as Alpek Polyester Mississippi Inc; Polychemie Inc; US Navy - Naval Special Warfare Small Arms Range; SDWIS systems such as DIAMONDHEAD UTILITIES-NORTH; CITY OF BAY ST LOUIS; CITY OF WAVELAND anchor Hancock, MS's EPA extract. Derived burden score 40/100 (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 Hancock include CITY OF BAY ST LOUIS; CITY OF WAVELAND; STANDARD DEDEAUX WATER ASSOCIATION, while Alpek Polyester Mississippi Inc leads reported TRI pounds among local Form R filers. AQS median AQI 43 / peak 87 in 2024.

Burden score 40/100 (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 Hancock -- 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 Hancock, MS: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

+83.7%

6 facilities that filed in 2022 and 2023

Whole inventory

+83.7%

101.4 thousand lb → 186.2 thousand lb, every facility that filed

  • Hancock, MS's total reported releases rose from 101.4 thousand lb in 2022 to 186.2 thousand lb in 2023, based on EPA TRI filings.
  • Hancock, MS's off-site transfers rose from 3.8 thousand lb in 2022 to 78.5 thousand lb in 2023, based on EPA TRI filings.
  • Hancock, MS's water releases fell from 6.5 thousand lb in 2022 to 4.9 thousand lb in 2023, based on EPA TRI filings.
  • Hancock, MS's air releases rose from 81.2 thousand lb in 2022 to 92.7 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
46,057
TRI Facilities
6
Water Systems
11
Superfund Sites
0
Total Releases
577.8K lbs

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 245 (69%) 112 0 87
2023 188 (52%) 175 1 112
2022 238 (66%) 121 0 89
2021 225 (63%) 135 0 97
2020 217 (62%) 134 0 90
2024 Good Air Quality: 69% of days
Median AQI: 43

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 (11)

System System pop (SDWIS) Violations
DIAMONDHEAD UTILITIES-NORTH 12,577 0
CITY OF BAY ST LOUIS 9,284 21
CITY OF WAVELAND 6,400 6
STANDARD DEDEAUX WATER ASSOCIATION 5,386 3
STENNIS SPACE CENTER 4,700 0
HANCOCK COUNTY WATER & SEWER 3,254 45
HANCOCK COUNTY WATER & SEWER- BAYSIDE 2,458 0
PEARLINGTON WATER AND SEWER DISTRICT 1,412 0
MEADOWS MOBILE HOME PARK 250 6
TROY TERRACE MHP 150 0
SUNRISE MOBILE HOME PARK 25 0

TRI Facilities (6)

# Facility Total Releases
1 Alpek Polyester Mississippi Inc 360.7K lbs
2 Polychemie Inc 135.7K lbs
3 US Navy - Naval Special Warfare Small Arms Range 50.8K lbs
4 Sabic Innovative Plastics US LLC 22.0K lbs
5 Calgon Carbon Corp - Pearl River Plant 8.5K lbs
6 Gulf States Ready-Mix Plant 25 1 lbs

Cities in Hancock (7)

Bay Saint Louis
4 facilities · 0 water
Pearlington
1 facilities · 2 water
Stennis Space Center
1 facilities · 1 water
Diamondhead
0 facilities · 3 water
Kiln
0 facilities · 3 water
Bay St Louis
0 facilities · 1 water
Waveland
0 facilities · 1 water

Frequently Asked Questions

What is the environmental risk level in Hancock, Mississippi? ▼
Hancock, MS has an environmental risk score of 40/100 (Moderate Risk), based on 6 TRI facilities, 0 Superfund sites, and 11 water systems on record. 5 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Hancock? ▼
No Superfund National Priorities List (NPL) sites are currently registered in Hancock, MS in the EPA database.
How many toxic release facilities are in Hancock? ▼
Hancock, MS has 6 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 577.8K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Hancock? ▼
In 2024, Hancock, MS recorded a median AQI of 43 and a peak AQI of 87. 69% of monitored days had "Good" air quality (AQI 0–50). Source: EPA Air Quality System (AQS) Annual AQI by County.
Is the drinking water safe in Hancock? ▼
Hancock, MS has 11 EPA-regulated water systems. 5 systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental agencies cover Hancock? ▼
Environmental compliance in Hancock, Mississippi is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Mississippi state environmental agency. Facilities report to the EPA Toxic Release Inventory, water systems are regulated under the Safe Drinking Water Act, and contaminated sites are managed under the Superfund program. Contact your state environmental agency for local concerns.

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.

Related Guides

Understanding EPA Data
How EPA collects and publishes environmental data
Environmental Justice
Who lives near polluters and environmental hazards
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro