How to Find Your Delaware Water System

Before you can trust any water-quality claim, confirm the exact system serving your address.

Public water

Official-source check: This page summarizes current Delaware guidance. Use Drinking Water Watch, operated by the Division of Public Health's Office of Drinking Water, for official system identification.

Short answer: Check your water bill for the provider name, then confirm it in Drinking Water Watch by searching your system name or municipality until you find a matching Public Water System ID (PWSID).

Who this is for: any Delaware resident, renter, buyer, or landlord who wants to identify their water provider before reading a report or requesting service.

Delaware context

Delaware has municipal systems, regulated investor-owned utilities, subdivision and mobile-home systems, and non-transient systems, and a single town can be served by more than one system. Your town's name is a starting point, not a confirmation — you need your specific system's PWSID.

Common Delaware system names include Artesian Water Company, Tidewater Utilities, Veolia Water Delaware (formerly SUEZ), City of Newark, Dover Water Department, and Wilmington Water Department. Use these names only as search starting points: Drinking Water Watch shows separate system records, source types, service areas, and PWSIDs. For example, its live records identify Artesian as DE0000552, Newark as DE0000630, Dover as DE0000571, Wilmington as DE0000663, and Veolia as DE0000564.

Step-by-step

  1. Check your water bill or landlord/property records for the provider's name.
  2. Go to Drinking Water Watch and search by system name or municipality.
  3. Confirm the PWSID and that the system's service area includes your address.
  4. Note the system's official name exactly as listed — you'll need it to find the correct CCR.
  5. If you can't find a match, contact your municipality or the Office of Drinking Water for help identifying your provider.

Why the PWSID matters for treatment decisions

Two homes in the same municipality can receive water from different systems or purchase water through an interconnection. The PWSID is the bridge between your address and the system's source, monitoring schedule, violations, treatment information, and CCR. It also prevents a common mistake: choosing a carbon filter because a neighboring utility reports chlorine, when your actual system or source has a different treatment profile.

What to save for your records

  • Utility name and PWSID
  • Service address and municipality
  • Current CCR and any public notices
  • Whether the property has a point-of-entry filter, softener, or RO
  • Date and scope of any household tap testing

What the result does and does not prove

Confirming your system tells you which entity is responsible for your water and which CCR applies to you. It does not tell you what's actually in your water at the tap — that requires reading the current CCR and, if relevant, understanding your own household plumbing.

Use the lookup before choosing treatment

Save the exact system name and PWSID before comparing filters. Delaware systems may purchase or exchange water, and the same municipality can contain a municipal system, an investor-owned system, a subdivision system, and private wells. The source and treatment information in one report should not be assigned to a neighboring system without confirmation.

For taste or odor, the PWSID tells you which utility notice and disinfectant information to check. For PFAS, lead, or other regulated contaminants, it tells you which CCR and monitoring record applies. For a private well, the lookup confirms that the property is outside public-water CCR coverage and points you toward DNREC and DPH resources instead.

Common mistakes

  • Assuming your town's name is also your system's name
  • Using an old bill from a previous resident or owner
  • Stopping at the first system that comes up in a general web search instead of confirming in Drinking Water Watch

When to contact the utility, ODW, or a professional

If you cannot determine your system after checking Drinking Water Watch, contact your municipality or the Office of Drinking Water directly.

Official sources

Related

What if two systems seem to serve my town?

This is common in Delaware, especially in growing Sussex County communities. Confirm which one maps to your exact address in Drinking Water Watch rather than assuming based on your neighbors or a general town-level search.

This page provides general educational information and is not regulatory advice. DelawareWaterQuality.com is an independent resource and is not affiliated with ODW.

Last reviewed: 2026-07-11. Report a correction.

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