Waukesha County, WI parcel and infrastructure data API
Korzy has about 160,000 parcel records for Waukesha County, Wisconsin, with source updates through October 2026. Nearly every record carries owner names; 94% include values and 92% include land use. In and around the county the API also maps 2 data-center projects (1 operating); 1 port with reported cargo; and 3 power plants with about 15 MW of capacity, led by other fuels. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.
Parcel coverage in Waukesha County
About 160,000 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:
| Field | Coverage | Share |
|---|---|---|
| Situs address | Nearly all · 99% | |
| Owner name | Nearly all · 96% | |
| Assessed or market value | Most · 94% | |
| Year built | Not published | |
| Building size | Not published | |
| Last sale | Not published | |
| Land use | Most · 92% | |
| Zoning | Not published |
Owner name and mailing address are returned by /v1/enrich with the owner group, at 2 credits per parcel instead of 1 credit. 96% of Waukesha County records carry an owner name.
Infrastructure in and around Waukesha County
Power plants
3 operable plants with about 15 MW of nameplate capacity; largest by capacity: other fuels, solar.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 20 in-service substations, 1 rated 230 kV or higher.
About 240 miles of transmission lines: about 130 mi at 100–161 kV; about 30 mi at 220–287 kV; about 80 mi at 345 kV.
Water and sewer service
Service areas of about 55 community water systems cover about 28% of the county.
Sewer service areas of about 10 systems cover about 53%.
At an address or point: /v1/lookup section utilities
Data-center projects
2 tracked projects: 1 operating, 1 status not reported.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 13% of the county on the current federal flood maps, published September 2026.
Mapped wetlands cover about 16%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 120 miles of active rail, about 100 of it main line
- About 45 miles of national freight network highway
- 1 port area with reported cargo tonnage
Within 25 km: /v1/lookup section logistics
Example requests for Waukesha County
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 1111 DELAFIELD ST, CITY OF WAUKESHA, WI 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":"1111 DELAFIELD ST, CITY OF WAUKESHA, WI","sections":["utilities"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "1111 DELAFIELD ST, CITY OF WAUKESHA, WI", "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": -88.23954336253178,
"latitude": 43.023899650000004,
"address": "1111 DELAFIELD ST, CITY OF WAUKESHA",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "55133-4bb7e9c26adb01ed53b0",
"korzy_id": "55133-4bb7e9c26adb01ed53b0",
"parcelid": "WAKC0999990",
"parceladdr": "1111 DELAFIELD ST",
"parcelcity": "CITY OF WAUKESHA",
"situs_zip": "53186",
"statefp": "55",
"geoid": "55133",
"longitude": -88.23954336253178,
"latitude": 43.023899650000004,
"land_use_code": "2",
"taxacres": 0,
"totalvalue": 23421400,
"land_value_usd": 3232200,
"improvement_value_usd": 24995800,
"assessed_value_usd": 28228000,
"market_value_usd": 28973500,
"updated": "2025-01-01"
}
],
"truncated": false
},
"sections": {
"utilities": {
"status": "ok",
"data": {
"water": [
{
"id": "utility:water:41364",
"feature_id": "water:41364",
"name": "WAUKESHA WATER UTILITY",
"boundary_basis": "System Sourced"
}
],
"sewer": [
{
"id": "utility:sewer:3260",
"feature_id": "sewer:3260",
"name": "WAUKESHA STP",
"boundary_basis": "Sourced"
}
],
"treatment_plants": [
{
"id": "utility:treatment:11601",
"feature_id": "treatment:11601",
"name": "WAUKESHA STP",
"distance_km": 3.001544716957899
},
{
"id": "utility:treatment:11343",
"feature_id": "treatment:11343",
"name": "BROOKFIELD - Fox River WPCC",
"distance_km": 6.031518475409568
},
{
"id": "utility:treatment:11582",
"feature_id": "treatment:11582",
"name": "SUSSEX REGIONAL WWTP",
"distance_km": 11.419839633162066
}
],
"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 55133-4bb7e9c26adb01ed53b0, 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":"55133-4bb7e9c26adb01ed53b0"}],"fields":["identity","sale","owner"]}' \
https://api.korzy.co/v1/enrich3. 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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/55133-4bb7e9c26adb01ed53b0JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("55133-4bb7e9c26adb01ed53b0")}`, {
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);Waukesha County data questions
- How many parcels in Waukesha County include values?
- About 150,000 of about 160,000 parcel records (94%) include values.
- Does the Korzy API return owner names for Waukesha County parcels?
- Yes. 96% of Waukesha County 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 Waukesha County?
- Korzy tracks 2 data-center projects in Waukesha County: 1 operating and 1 status not reported. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Waukesha County?
- 3 operable power plants in Waukesha County total about 15 MW of nameplate capacity, mainly other fuels and solar.
- Which water systems serve Waukesha County?
- Service areas of about 55 community water systems cover about 28% of Waukesha County, and sewer service areas cover about 53%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
Build on Waukesha County 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.