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Hi3 Water

Connecticut Water Assets

New England

Connecticut's water resources include glacial aquifers, the Connecticut River basin, and a regulated riparian system with permit requirements.

Regulated Riparian11 counties tracked2024 active alerts
24,398
Total Assets
56.6
Avg WIS
18,019
Verified
0
High WIS (75+)

Connecticut Water Intelligence Report

Hi3 Water tracks 24,398 water assets across Connecticut, spanning 11 counties and 7 distinct asset types. The average Water Intelligence Score (WIS) across Connecticut is 56.6/100, with 0 assets scoring in the high-value range (75+). Connecticut operates under Regulated Riparian water law, which directly affects water rights acquisition and asset valuation in this state.

The dominant water asset type in Connecticut is River (14,899 assets, avg WIS 64.8). The highest concentration is in 110 County with 2,497 tracked assets.

2,024 active regulatory alerts are currently tracked in Connecticut, 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: June 29, 2026.

Asset Types in Connecticut

River
14,899
Avg WIS 64.8
Well
6,358
Avg WIS 42.6
Lake
1,876
Avg WIS 42.0
Reservoir
1,243
Avg WIS 52.7
Spring
20
Avg WIS 41.3
Aquifer
1
Avg WIS 73.0
Fossil Water
1
Avg WIS 73.0

Intelligence Grade Distribution

How Connecticut assets are graded

S (≥90) — Exceptional0 (0.0%)
A (75-89) — Excellent0 (0.0%)
B (55-74) — Good15,465 (63.4%)
C (35-54) — Fair8,933 (36.6%)
D (<35) — Limited0 (0.0%)

Regulatory Alerts

Drought, EPA violations, and enforcement actions affecting Connecticut

0
critical
17
high
2000
medium
7
low
0
info
CONNECTICUT RIVER AT THOMPSONVILLE, CT — Gage Height 10.4 ft
usgs_flood · flood_warning
HOUSATONIC RIVER NEAR NEW MILFORD, CT — Gage Height 10.4 ft
usgs_flood · flood_warning
Nuclear Reactor: Millstone 3
fema_nrc · nuclear_reactor

Top Counties in Connecticut

110
2,497 assetsWIS 43
140
803 assetsWIS 42
130
802 assetsWIS 42
170
644 assetsWIS 42
160
485 assetsWIS 42
190
414 assetsWIS 42
180
389 assetsWIS 42
150
240 assetsWIS 43
120
103 assetsWIS 42
Hartford
2 assetsWIS 73
New London
1 assetsWIS 44

Aquifer Type Mix

unconfined
826
Avg WIS 45
confined
26
Avg WIS 53
fossil
1
Avg WIS 73

Top 10 Water Assets in Connecticut

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

View all on map
  1. 1

    Hartford Basin Deep Fossil Aquifer — Central Connecticut

    Fossil Water
    Hartford County·50 GPM
    73
    WIS
  2. 2

    Early Mesozoic Basin Aquifer — Hartford Basin

    Aquifer
    Hartford County·100 GPM
    73
    WIS
  3. 3

    Northfield Brook Dam

    Reservoir
    ·3,949,713 GPM
    67
    WIS
  4. 4

    Easton Reservoir Dam

    Reservoir
    ·1,974,856 GPM
    67
    WIS
  5. 5

    Goodwin

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

    Mad River Flood Control Dam

    Reservoir
    ·13,285,398 GPM
    67
    WIS
  7. 7

    Thomaston Dam

    Reservoir
    ·50,000,000 GPM
    67
    WIS
  8. 8

    Black Rock Dam

    Reservoir
    ·15,035,839 GPM
    67
    WIS
  9. 9

    Shepaug

    Reservoir
    ·50,000,000 GPM
    67
    WIS
  10. 10

    Saville Dam

    Reservoir
    ·5,139,115 GPM
    67
    WIS
Avg Flow Rate
218,418 GPM
Avg Depth
123 ft
For Sale
0
Fossil Water
1

Explore Connecticut on the Interactive Map

View all 24,398 water assets, aquifer boundaries, water rights data, and regulatory alerts for Connecticut.

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