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
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.
| County | Sites | Density | Dominant Source |
|---|---|---|---|
| Baltimore | 2,675 | 39.90 | Underground Storage Tanks |
| Anne Arundel | 2,402 | 7.72 | Underground Storage Tanks |
| Baltimore | 3,433 | 7.68 | Underground Storage Tanks |
| Prince George's | 2,746 | 7.16 | Underground Storage Tanks |
| Howard | 1,216 | 6.44 | Brownfields |
| Montgomery | 2,588 | 6.43 | Underground Storage Tanks |
| Harford | 1,421 | 4.52 | Underground Storage Tanks |
| Wicomico | 1,099 | 3.99 | Underground Storage Tanks |
| Washington | 1,238 | 3.86 | Underground Storage Tanks |
| Kent | 553 | 3.36 | Nitrate |
Baltimore
Sites
3K
Density
39.9
Source
Underground Storage TanksAnne Arundel
Sites
2K
Density
7.7
Source
Underground Storage TanksBaltimore
Sites
3K
Density
7.7
Source
Underground Storage TanksPrince George's
Sites
3K
Density
7.2
Source
Underground Storage TanksHoward
Sites
1K
Density
6.4
Source
BrownfieldsMontgomery
Sites
3K
Density
6.4
Source
Underground Storage TanksHarford
Sites
1K
Density
4.5
Source
Underground Storage TanksWicomico
Sites
1K
Density
4.0
Source
Underground Storage TanksWashington
Sites
1K
Density
3.9
Source
Underground Storage TanksKent
Sites
553
Density
3.4
Source
NitrateAgricultural 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: HighWe checked the federal record around Baltimore — 2,675 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
- Attis — Underground Storage Tanks · ~0.1 km from the county center
- Baltimore City Central Booking And Intake Center — Underground 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: HighWe checked the federal record around Anne Arundel County — 2,402 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 #0689 — Brownfields · ~0.6 km from the county center
- Safeway Store #2629 — Brownfields · ~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: HighWe checked the federal record around Baltimore County — 3,433 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 Bp — Underground Storage Tanks · ~0.6 km from the county center
- Betty Brite Cleaners — Brownfields · ~0.7 km from the county center
- Jiffy Lube Store #687 — Underground 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: HighWe checked the federal record around Prince George's County — 2,746 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 Ii — Underground Storage Tanks · ~0.5 km from the county center
- Buddy Farr Excavating — Underground Storage Tanks · ~0.7 km from the county center
- Exxon R/S #25382 — Underground 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: ElevatedWe checked the federal record around Howard County — 1,216 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 Clarksville — Underground Storage Tanks · ~0.5 km from the county center
- Ho Be 21 — Nitrate · ~0.8 km from the county center
- Ho Cd 25 — Nitrate · ~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: HighWe checked the federal record around Montgomery County — 2,588 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 Depot — Underground Storage Tanks · ~0.3 km from the county center
- Londonderry Towers Apartments — Underground Storage Tanks · ~0.3 km from the county center
- Wssc Gaithersburg Garage — Brownfields · ~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
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:
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