Address Lookup: Find Your Exact Water Utility
Enter any US street address to find the specific water utility serving your home. Geocoded against EPA Safe Drinking Water Act service-area boundaries for 44,642 public water systems.
- The water utility serving your exact address
- Any other utilities that serve parts of your ZIP
- A link to the full water-quality report for each system
Privacy: Your address is used once to look up your water utility and is not stored, logged, or shared. Geocoding is performed by the US Census Bureau.
Why address matters more than ZIP
A single ZIP code can overlap two, three, or even a dozen separate water systems. In suburbs, one side of a street may be served by a municipal utility while the other is served by a private water company or a neighboring city. Rural ZIPs often mix a town system with several small rural water associations. EPA's Service Area Boundaries v3 dataset (44,642 community water systems) shows that 62% of US ZIPs are served by at least two distinct utilities. Knowing the exact system that serves your home is the only way to look up the correct Consumer Confidence Report, the correct violation history, and the correct water quality data.
This tool geocodes your address via the US Census Bureau, then performs a point-in-polygon check against each water utility's official service-area boundary. If multiple systems overlap your location, we list them in order of population served — the largest is typically the provider, but secondary and adjacent systems may serve portions of the same block.
Frequently Asked Questions
Where does the address geocoding happen?
We send your address to the US Census Bureau's public Geocoder API, which converts it to latitude/longitude. Your address is not stored on our servers, not logged, and not shared with third parties. Only the Census Bureau (a federal agency) receives the address text.
Which water-utility dataset does this use?
We use the EPA Safe Drinking Water Information System (SDWIS) Service Area Boundaries v3, released in 2024. It covers 44,642 community water systems across all 50 states plus DC and territories. About 2,000 small rural systems (mostly tribal and very new) do not yet have official polygons — for those, this tool may report no match.
Why does my ZIP show multiple utilities?
In EPA's v3 dataset, 62% of US ZIPs are served by two or more community water systems. Service boundaries are drawn around physical infrastructure, not mail delivery routes, so the two often diverge. The tool lists the system serving your exact coordinates first, then the next-largest utilities that overlap the same ZIP.
What if the tool returns no match?
Three common reasons: (1) you're served by a private well or a very small rural system that doesn't have a mapped boundary; (2) the address didn't geocode (try adding city and state); (3) you're in a new development outside the current EPA boundary dataset. If you know your utility's name, search for it directly at EPA ECHO.
Is this an official EPA tool?
No. ZipCheckup is a private publisher that compiles public EPA, Census, and federal data. This tool uses official EPA Service Area Boundaries v3 data but is not affiliated with or endorsed by the EPA.
Data Sources & Methodology
Data Sources
- US Census Geocoder — Public geocoding API — address → latitude/longitude
- EPA CWS Service Area Boundaries v3 — 44,642 community water system boundaries, 2024 vintage
- EPA SDWIS — Safe Drinking Water Act violation and contaminant data per PWSID
Methodology
Your address is geocoded via the US Census Bureau. The resulting coordinates are then filtered against per-state utility bounding boxes, followed by a point-in-polygon test against each candidate utility's service-area boundary. Matches are returned sorted by population served. Caching keys use SHA-256 digests of normalized addresses — plaintext addresses are never written to our caches or logs.