Connecticut Contamination Data

State Contamination Profile

Elevated Risk Level19,222 documented sites
Connecticut ranks 4th of 50 states by severity-weighted density — a screening measure of how much documented history sits in the federal record per square mile. That describes the record, not any single yard: the map shows where each documented site actually sits.

Total Sites

19,222

9 federal databases

Severity Density

5.38

Severity-weighted sites per sq mi

High-Severity Sites

342

Superfund NPL, PFAS detections + similar top-tier records

Data Sources

EPA, USGS

9 databases checked

High-severity counts the top severity tier of the record — the sites most worth checking distances against.

Source Breakdown

Top Counties in Connecticut

Greater Bridgeport County carries Connecticut's densest documented record — 11.46 severity-weighted sites per square mile across 1,220 records, most commonly Underground Storage Tanks, including 22 high-severity sites. Density describes the county's record, not any single parcel.

Agricultural Pesticide Use in Connecticut

In the 2019 federal survey estimates, Connecticut's most-applied agricultural pesticides statewide were Glyphosate, Metolachlor & Metolachlor-S and Atrazine. These estimates describe agricultural land use across the state — context for what's in use around the region, not a reading on any garden's soil.

Pesticide data: USGS NAWQA Pesticide National Synthesis Project (EPest county-level use estimates). Latest available county estimates: 2019.

County-Level Detail in Connecticut

The federal record isn't uniform across a state. Here's what's documented around Connecticut's counties with the densest records — each read from that county's own sites, not the state average. Proximity is information, not a diagnosis; a soil test settles any near neighbor.

Is It Safe to Grow Food in Greater Bridgeport County?

Federal record: High

We checked the federal record around Greater Bridgeport County1,220 documented sites across 6 of the 9 source types we track, 22 of them high-severity.

The most significant on record: 19 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Greater Bridgeport County carries one of the heavier federal records we track — 1,220 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

Documented sites nearest the Greater Bridgeport County center

  • 2001 Park AveBrownfields · ~0.2 km from the county center
  • New England Heating Supply LlcBrownfields · ~0.3 km from the county center
  • Mobil Oil Corp Serv Sta Hg0Brownfields · ~0.3 km from the county center

These are the closest documented sites to Greater Bridgeport County's geographic center — a screening reference, not a reading on any specific address. Check your own Connecticut parcel to see what's actually near you.

Is It Safe to Grow Food in South Central Connecticut County?

Federal record: High

We checked the federal record around South Central Connecticut County2,803 documented sites across 7 of the 9 source types we track, 27 of them high-severity.

The most significant on record: 24 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

South Central Connecticut County carries one of the heavier federal records we track — 2,803 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

Documented sites nearest the South Central Connecticut County center

  • Global Montello Group # 837Underground Storage Tanks · ~0.5 km from the county center
  • Alliance Energy Llc #836Underground Storage Tanks · ~0.6 km from the county center
  • Walmart #2232Brownfields · ~1.2 km from the county center

These are the closest documented sites to South Central Connecticut County's geographic center — a screening reference, not a reading on any specific address. Check your own Connecticut parcel to see what's actually near you.

Is It Safe to Grow Food in Naugatuck Valley County?

Federal record: High

We checked the federal record around Naugatuck Valley County2,498 documented sites across 7 of the 9 source types we track, 66 of them high-severity.

The most significant on record: 57 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Naugatuck Valley County carries one of the heavier federal records we track — 2,498 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

Documented sites nearest the Naugatuck Valley County center

  • Wpca Pump Station #1Underground Storage Tanks · ~0.7 km from the county center
  • Wpca Pump Station #5Underground Storage Tanks · ~1.4 km from the county center
  • Middlebury Highway Dept. GarageUnderground Storage Tanks · ~2.0 km from the county center

These are the closest documented sites to Naugatuck Valley County's geographic center — a screening reference, not a reading on any specific address. Check your own Connecticut parcel to see what's actually near you.

Is It Safe to Grow Food in Capitol County?

Federal record: High

We checked the federal record around Capitol County5,491 documented sites across 8 of the 9 source types we track, 98 of them high-severity.

The most significant on record: 83 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Capitol County carries one of the heavier federal records we track — 5,491 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

Documented sites nearest the Capitol County center

  • Fluoropolymer Resources, LlcToxic Release Inventory · ~1.3 km from the county center
  • Ct- Sw 136Nitrate · ~1.4 km from the county center
  • Eastern Roofing CorpUnderground Storage Tanks · ~1.6 km from the county center

These are the closest documented sites to Capitol County's geographic center — a screening reference, not a reading on any specific address. Check your own Connecticut parcel to see what's actually near you.

Is It Safe to Grow Food in Western Connecticut County?

Federal record: High

We checked the federal record around Western Connecticut County2,573 documented sites across 7 of the 9 source types we track, 49 of them high-severity.

The most significant on record: 34 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Western Connecticut County carries one of the heavier federal records we track — 2,573 documented sites, most of them underground storage tanks. That's a record of the area's history, not a verdict on any one yard: proximity to a documented site is information, not a diagnosis. Before food beds go in, a professional soil test tells you exactly what you're working with — and raised beds with clean imported soil grow well almost anywhere in the meantime.

Documented sites nearest the Western Connecticut County center

  • Redding Oil StorageUnderground Storage Tanks · ~0.1 km from the county center
  • Cvs Pharmacy #10462Brownfields · ~1.3 km from the county center
  • Branchville Mica MineMining · ~1.4 km from the county center

These are the closest documented sites to Western Connecticut County's geographic center — a screening reference, not a reading on any specific address. Check your own Connecticut parcel to see what's actually near you.

Check an Address in Connecticut

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Read your Connecticut parcel

See exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.

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Your soil pHYour frost-free daysYour sun & shade

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25+ data sources analyzed in seconds

EPA FRS CERCLISArcGIS Online UST FinderEPA FRS TRIEPA FRS ACRESEPA UCMR 5USGS Water Quality PortalEPA FRS NPDESUSGS MRDSUSGS NAWQA EPest