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Southeastern Connecticut Planning Region, CT parcel and infrastructure data API

Korzy has about 120,000 parcel records for Southeastern Connecticut Planning Region, Connecticut, with source updates through October 2026. Nearly every record carries values, last sale, land use and year built; 90% include building size and 64% include owner names. In and around the planning region the API also maps about 45 power plants with about 3,000 MW of capacity, led by nuclear; and 1 data-center project (1 operating). Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.

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Parcel coverage in Southeastern Connecticut Planning Region

About 120,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from October 2026. Each record has a stable korzy_id you can store and look up again with /v1/records/{id}. Share of records with each field:

FieldCoverageShare
Situs addressNearly all · 99%
Owner nameMany · 64%
Assessed or market valueNearly all · 98%
Year builtNearly all · 95%
Building sizeMost · 90%
Last saleNearly all · 96%
Land useNearly all · 98%
ZoningMany · 63%

Owner name and mailing address are returned by /v1/enrich with the owner group, at 2 credits per parcel instead of 1 credit. 64% of Southeastern Connecticut Planning Region records carry an owner name.

Infrastructure in and around Southeastern Connecticut Planning Region

Power plants

About 45 operable plants with about 3,000 MW of nameplate capacity; largest by capacity: nuclear, oil, natural gas. Proposed generators add 5 MW.

Within 50 km: /v1/lookup section power; details: /v1/records/{id}

Substations and transmission

About 50 in-service substations, 5 rated 230 kV or higher.

About 290 miles of transmission lines: 5 mi at under 100 kV; about 180 mi at 100–161 kV; about 100 mi at 345 kV.

Water and sewer service

Service areas of about 85 community water systems cover about 19% of the planning region.

Sewer service areas of about 15 systems cover about 9%.

At an address or point: /v1/lookup section utilities

Data-center projects

1 tracked project: 1 operating. Reported planned capacity: about 300 MW.

Within 10 km: /v1/lookup section datacenters

Grid capacity data

2 utility-published grid capacity layers cover parts of Southeastern Connecticut Planning Region, including load headroom, loading forecasts.

Nearby records: /v1/lookup section grid

Flood zones and wetlands

Special flood hazard areas cover about 10% of the planning region on the current federal flood maps, published September 2026.

Mapped wetlands cover about 7%.

At an address or point: /v1/lookup section environment

Rail, ports and freight

  • About 55 miles of national freight network highway

Within 25 km: /v1/lookup section logistics

Example requests for Southeastern Connecticut Planning Region

The lookup response is a real production response, trimmed to the main fields. Every request needs an API key with api:read; see authentication and credits and limits.

1. Find a parcel and its water and sewer service

/v1/lookup matches 601 ROUTE 32, Montville, CT and returns the parcel's korzy_id and record, plus the water and sewer service areas at the parcel and the nearest treatment plants. 2 credits.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"address":"601 ROUTE 32, Montville, CT","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup
Python
import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "601 ROUTE 32, Montville, CT", "sections": ["utilities"]},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=60,
)
response.raise_for_status()
body = response.json()
parcel = body["parcels"]["records"][0]
print(parcel["korzy_id"], body["sections"]["utilities"]["status"])
Production response (trimmed)
{
  "location": {
    "longitude": -72.10438580478167,
    "latitude": 41.4418595,
    "address": "601 ROUTE 32, Montville",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "09180-e968ab55eb412f584daf",
        "korzy_id": "09180-e968ab55eb412f584daf",
        "parcelid": "079-017-000",
        "parceladdr": "601 ROUTE 32",
        "parcelcity": "Montville",
        "situs_zip": "06382",
        "statefp": "09",
        "geoid": "09180",
        "longitude": -72.10438580478167,
        "latitude": 41.4418595,
        "usedesc": "Commercial",
        "land_use_code": "200",
        "zoning_code": "C-2",
        "yearbuilt": 1961,
        "bldgsqft": 46011,
        "taxacres": 5,
        "totalvalue": 3675280,
        "land_value_usd": 449800,
        "improvement_value_usd": 4800600,
        "assessed_value_usd": 3755150,
        "saledate": "2015-10-02",
        "saleamt": 3500000,
        "updated": "2026-01-01"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:35463",
            "feature_id": "water:35463",
            "name": "MONTVILLE WATER SUPPLY",
            "boundary_basis": "System Sourced"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:162",
            "feature_id": "sewer:162",
            "name": "MONTVILLE WPCF",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:634",
            "feature_id": "treatment:634",
            "name": "MONTVILLE WPCF",
            "distance_km": 0.4943016735397662
          },
          {
            "id": "utility:treatment:646",
            "feature_id": "treatment:646",
            "name": "NORWICH WPCF",
            "distance_km": 9.522137924841767
          },
          {
            "id": "utility:treatment:621",
            "feature_id": "treatment:621",
            "name": "GROTON CITY WPCF",
            "distance_km": 9.905245002063475
          }
        ],
        "truncated": {
          "water": false,
          "sewer": false
        }
      },
      "provenance": [
        {
          "dataset": "water",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        },
        {
          "dataset": "sewer",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        },
        {
          "dataset": "treatment",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        }
      ]
    }
  },
  "credits": {
    "charged": 2,
    "refunded": 0
  }
}

2. Add owner and sale fields

/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 09180-e968ab55eb412f584daf, with the owner group. 2 credits.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"09180-e968ab55eb412f584daf"}],"fields":["identity","sale","owner"]}' \
  https://api.korzy.co/v1/enrich

3. Fetch the record again by ID

/v1/records/{id} returns the stored parcel's full record, without owner fields. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/09180-e968ab55eb412f584daf
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("09180-e968ab55eb412f584daf")}`, {
  headers: { Authorization: `Bearer ${process.env.KORZY_API_KEY}` },
});
if (!response.ok) throw new Error(`Korzy API ${response.status}`);
const { record } = await response.json();
console.log(record.parceladdr, record.usedesc);

Southeastern Connecticut Planning Region data questions

How many parcels in Southeastern Connecticut Planning Region include year built?
About 110,000 of about 120,000 parcel records (95%) include year built.
Does the Korzy API return owner names for Southeastern Connecticut Planning Region parcels?
Yes. 64% of Southeastern Connecticut Planning Region parcel records carry an owner name. Ask /v1/enrich for the owner group; each parcel then costs 2 credits instead of 1 credit. Lookups and records never include owner fields.
How many data-center projects are in Southeastern Connecticut Planning Region?
Korzy tracks 1 data-center project in Southeastern Connecticut Planning Region: 1 operating. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
How much power generation is in Southeastern Connecticut Planning Region?
About 45 operable power plants in Southeastern Connecticut Planning Region total about 3,000 MW of nameplate capacity, mainly nuclear, oil and natural gas.
Which water systems serve Southeastern Connecticut Planning Region?
Service areas of about 85 community water systems cover about 19% of Southeastern Connecticut Planning Region, and sewer service areas cover about 9%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Southeastern Connecticut Planning Region parcel data

Lookups, enrichment and records work the same in every county Korzy covers. Credits are shared across parcels, utilities, environment, logistics, power, grid, data-center and terrain sections.

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