PlainEnviro

Knox, ME

Moderate Risk (41/100)

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 Knox in Maine · Population: 40,860

TRI sites such as North End Composites; International N&h USA Inc.; Dragon Products Co; SDWIS systems such as NORTH HAVEN WATER DEPARTMENT; PORT CLYDE WATER DISTRICT; MOUNTAINSIDE MOBILE HOME PARK; NPL sites such as Union Chemical Co., Inc. anchor Knox, ME's EPA extract. Derived burden score 41/100 (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 Knox include NORTH HAVEN WATER DEPARTMENT; MOUNTAINSIDE MOBILE HOME PARK; CRAWFORD COMMONS, while North End Composites leads reported TRI pounds among local Form R filers. AQS median AQI 33 / peak 84 in 2024.

Burden score 41/100 (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 Knox -- 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 Knox, ME: EPA TRI 2023 reporting year

2022 → 2023

Same facilities, both years

-12.3%

5 facilities that filed in 2022 and 2023

Whole inventory

-12.3%

39.2 thousand lb → 34.3 thousand lb, every facility that filed

  • Knox, ME's total reported releases fell from 39.2 thousand lb in 2022 to 34.3 thousand lb in 2023, based on EPA TRI filings.
  • Knox, ME's off-site transfers fell from 14.9 thousand lb in 2022 to 10.8 thousand lb in 2023, based on EPA TRI filings.
  • Knox, ME's chemicals reported rose from 17 in 2022 to 18 in 2023, based on EPA TRI filings.
  • Knox, ME's air releases fell from 24.3 thousand lb in 2022 to 23.5 thousand lb in 2023, based on EPA TRI filings.
County population (Census ACS)
40,860
TRI Facilities
5
Water Systems
15
Superfund Sites
1
Total Releases
212.8K 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 343 (97%) 12 0 84
2023 296 (98%) 5 0 87
2022 206 (97%) 6 0 80
2021 192 (91%) 17 2 119
2020 142 (96%) 6 0 71
2024 Good Air Quality: 97% of days
Median AQI: 33

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 Maine, see the EPA's AirNow.gov.

Water Systems (15)

System System pop (SDWIS) Violations
NORTH HAVEN WATER DEPARTMENT 740 1
PORT CLYDE WATER DISTRICT 330 0
MOUNTAINSIDE MOBILE HOME PARK 130 1
FRIENDSHIP WATER DEPARTMENT 85 0
DUCKTRAP HARBOR CONDOMINIUMS 83 0
ELLIOTT APARTMENTS 55 0
CRAWFORD COMMONS 50 1
HADLEYS LAKE APARTMENTS 45 0
FOUR WINDS HOMEOWNERS ASSN 43 0
VILLAGE AT ROCKPORT #4 43 1
HARBOR VIEW I & II 40 3
DEER RIDGE MOBILE HOME PARK 33 0
VILLAGE AT ROCKPORT #1 30 10
VILLAGE AT ROCKPORT #2 30 0
VILLAGE AT ROCKPORT #3 25 0

TRI Facilities (5)

# Facility Total Releases
1 North End Composites 120.8K lbs
2 International N&h USA Inc. 52.0K lbs
3 Dragon Products Co 38.9K lbs
4 Fisher Engineering 1.1K lbs
5 Pike Industries Inc-Washington 6 lbs

Superfund Sites (1)

Site Name Status HRS Score
Union Chemical Co., Inc. Deleted NPL Site 32.11

Cities in Knox (12)

Rockland
3 facilities · 0 water
Thomaston
1 facilities · 2 water
Washington
1 facilities · 0 water
Camden
0 facilities · 6 water
Friendship
0 facilities · 1 water
North Haven
0 facilities · 1 water
Owls Head
0 facilities · 1 water
Port Clyde
0 facilities · 1 water
Rockport
0 facilities · 1 water
South Thomaston
0 facilities · 1 water
Union
0 facilities · 1 water
South Hope
0 facilities · 0 water

Frequently Asked Questions

What is the environmental risk level in Knox, Maine? ▼
Knox, ME has an environmental risk score of 41/100 (Moderate Risk), based on 5 TRI facilities, 1 Superfund sites, and 15 water systems on record. 6 water systems have health-based violations. Source: EPA TRI, SDWIS, and Superfund NPL.
Are there Superfund sites in Knox? ▼
Yes, Knox, ME has 1 Superfund site on the EPA National Priorities List (NPL). Superfund sites are contaminated locations that require long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
How many toxic release facilities are in Knox? ▼
Knox, ME has 5 TRI-reporting facilities on record with the EPA Toxic Release Inventory, with a combined total of 212.8K lbs in reported toxic releases. TRI facilities self-report annual chemical release data to the EPA.
What is the air quality in Knox? ▼
In 2024, Knox, ME recorded a median AQI of 33 and a peak AQI of 84. 97% 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 Knox? ▼
Knox, ME has 15 EPA-regulated water systems. 6 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 Knox? ▼
Environmental compliance in Knox, Maine is overseen by the U.S. Environmental Protection Agency (EPA) at the federal level and the Maine 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