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Hi3 Water

Maryland Water Assets

Mid-Atlantic

Maryland's water resources include Coastal Plain confined aquifers, Piedmont fractured rock aquifers, and the Chesapeake Bay watershed.

Regulated Riparian23 counties tracked2289 active alerts
68,399
Total Assets
55.3
Avg WIS
38,885
Verified
0
High WIS (75+)

Maryland Water Intelligence Report

Hi3 Water tracks 68,399 water assets across Maryland, spanning 23 counties and 5 distinct asset types. The average Water Intelligence Score (WIS) across Maryland is 55.3/100, with 0 assets scoring in the high-value range (75+). Maryland operates under Regulated Riparian water law, which directly affects water rights acquisition and asset valuation in this state.

The dominant water asset type in Maryland is River (37,626 assets, avg WIS 64.6). The highest concentration is in Washington County with 3,153 tracked assets.

2,289 active regulatory alerts are currently tracked in Maryland, including EPA violations, drought declarations, and state water board enforcement actions. Always check the regulatory intelligence for any asset before making acquisition decisions.

Data sources: USGS Water Data, EPA ECHO, state water boards, and verified field reports. Water Intelligence Scores are computed across flow rate, geological stability, legal accessibility, sustainability, and rarity. Report last updated: October 16, 2026.

Asset Types in Maryland

River
37,626
Avg WIS 64.6
Well
28,712
Avg WIS 43.7
Spring
802
Avg WIS 41.5
Lake
778
Avg WIS 42.0
Reservoir
481
Avg WIS 58.9

Intelligence Grade Distribution

How Maryland assets are graded

S (≥90) — Exceptional0 (0.0%)
A (75-89) — Excellent0 (0.0%)
B (55-74) — Good37,915 (55.4%)
C (35-54) — Fair30,484 (44.6%)
D (<35) — Limited0 (0.0%)

Regulatory Alerts

Drought, EPA violations, and enforcement actions affecting Maryland

14
critical
26
high
2243
medium
6
low
0
info
Hazardous Waste Facility: South Shore Elementary
epa_rcra · hazardous_waste
Hazardous Waste Facility: Severn Elementary
epa_rcra · hazardous_waste
Hazardous Waste Facility: Riviera Beach Elementary
epa_rcra · hazardous_waste

Top Counties in Maryland

Washington
3,153 assetsWIS 43
Harford
2,565 assetsWIS 42
Anne Arundel
2,563 assetsWIS 44
Howard
2,530 assetsWIS 42
Frederick
2,268 assetsWIS 42
Kent
1,988 assetsWIS 50
Baltimore
1,791 assetsWIS 44
Garrett
1,449 assetsWIS 44
Cecil
1,406 assetsWIS 42
Charles
1,143 assetsWIS 45
St. Mary's
1,097 assetsWIS 45
Worcester
1,016 assetsWIS 43

Aquifer Type Mix

confined
3,686
Avg WIS 53
unconfined
2,678
Avg WIS 45

Top 10 Water Assets in Maryland

Ranked by Water Intelligence Score — Maryland's highest-scoring springs, wells, and aquifers.

View all on map
  1. 1

    T. Howard Duckett Dam

    Reservoir
    ·48,709,833 GPM
    67
    WIS
  2. 2

    Savage River Dam

    Reservoir
    ·43,626,373 GPM
    67
    WIS
  3. 3

    Dry River

    River
    ·11,837 GPM
    67
    WIS
  4. 4

    Laurel Run

    River
    ·10,085 GPM
    67
    WIS
  5. 5

    Loch Raven Dam

    Reservoir
    ·50,000,000 GPM
    67
    WIS
  6. 6

    Druid Hill Lake Reservoir And Storage Tanks

    Reservoir
    ·107,719 GPM
    67
    WIS
  7. 7

    Liberty Dam

    Reservoir
    ·44,949,527 GPM
    67
    WIS
  8. 8

    Jennings Randolph Dam

    Reservoir
    ·50,000,000 GPM
    67
    WIS
  9. 9

    South Branch Potomac River

    River
    ·54,493 GPM
    67
    WIS
  10. 10

    Murley Run

    River
    ·3,901 GPM
    67
    WIS
Avg Flow Rate
201,916 GPM
Avg Depth
187 ft
For Sale
0
Fossil Water
0

Explore Maryland on the Interactive Map

View all 68,399 water assets, aquifer boundaries, water rights data, and regulatory alerts for Maryland.

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