Maryland Contamination Data

State Contamination Profile

Elevated Risk Level28,014 documented sites
Maryland ranks 6th 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

28,014

9 federal databases

Severity Density

3.86

Severity-weighted sites per sq mi

High-Severity Sites

219

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 Maryland

Baltimore County carries Maryland's densest documented record — 39.90 severity-weighted sites per square mile across 2,675 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 Maryland

In the 2019 federal survey estimates, Maryland'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 Maryland

The federal record isn't uniform across a state. Here's what's documented around Maryland'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 Baltimore?

Federal record: High

We checked the federal record around Baltimore2,675 documented sites across 7 of the 9 source types we track, 22 of them high-severity.

The most significant on record: 22 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Baltimore carries one of the heavier federal records we track — 2,675 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 Baltimore center

  • AttisUnderground Storage Tanks · ~0.1 km from the county center
  • Baltimore City Central Booking And Intake CenterUnderground Storage Tanks · ~0.1 km from the county center
  • Baltimore City School District (Eager Street Academy)Brownfields · ~0.1 km from the county center

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

Is It Safe to Grow Food in Anne Arundel County?

Federal record: High

We checked the federal record around Anne Arundel County2,402 documented sites across 7 of the 9 source types we track, 22 of them high-severity.

The most significant on record: 16 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Anne Arundel County carries one of the heavier federal records we track — 2,402 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 Anne Arundel County center

  • American Truck & Bus, Inc.Underground Storage Tanks · ~0.6 km from the county center
  • Staples The Office Superstore Eats, Inc #0689Brownfields · ~0.6 km from the county center
  • Safeway Store #2629Brownfields · ~0.6 km from the county center

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

Is It Safe to Grow Food in Baltimore County?

Federal record: High

We checked the federal record around Baltimore County3,433 documented sites across 8 of the 9 source types we track, 27 of them high-severity.

The most significant on record: 27 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Baltimore County carries one of the heavier federal records we track — 3,433 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 Baltimore County center

  • Timonium BpUnderground Storage Tanks · ~0.6 km from the county center
  • Betty Brite CleanersBrownfields · ~0.7 km from the county center
  • Jiffy Lube Store #687Underground Storage Tanks · ~0.9 km from the county center

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

Is It Safe to Grow Food in Prince George's County?

Federal record: High

We checked the federal record around Prince George's County2,746 documented sites across 7 of the 9 source types we track, 24 of them high-severity.

The most significant on record: 22 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Prince George's County carries one of the heavier federal records we track — 2,746 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 Prince George's County center

  • Presidential Plaza Building IiUnderground Storage Tanks · ~0.5 km from the county center
  • Buddy Farr ExcavatingUnderground Storage Tanks · ~0.7 km from the county center
  • Exxon R/S #25382Underground Storage Tanks · ~0.8 km from the county center

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

Is It Safe to Grow Food in Howard County?

Federal record: Elevated

We checked the federal record around Howard County1,216 documented sites across 7 of the 9 source types we track, 3 of them high-severity.

The most significant on record: 1 Superfund site. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

There's a meaningful federal record around Howard County — 1,216 documented sites, most of them brownfields. Worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard; a soil test before new food beds is the sensible step, and the map shows exactly which sites sit where.

Documented sites nearest the Howard County center

  • Central Maryland Research & Education Ctr. At ClarksvilleUnderground Storage Tanks · ~0.5 km from the county center
  • Ho Be 21Nitrate · ~0.8 km from the county center
  • Ho Cd 25Nitrate · ~0.8 km from the county center

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

Is It Safe to Grow Food in Montgomery County?

Federal record: High

We checked the federal record around Montgomery County2,588 documented sites across 7 of the 9 source types we track, 20 of them high-severity.

The most significant on record: 18 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.

Montgomery County carries one of the heavier federal records we track — 2,588 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 Montgomery County center

  • Gaithersburg DepotUnderground Storage Tanks · ~0.3 km from the county center
  • Londonderry Towers ApartmentsUnderground Storage Tanks · ~0.3 km from the county center
  • Wssc Gaithersburg GarageBrownfields · ~0.3 km from the county center

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

Check an Address in Maryland

Free Report

Read your Maryland parcel

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

Three things about your exact spot that zone averages miss:

Your soil pHYour frost-free daysYour sun & shade

We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.

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