A PWSID is the Public Water System Identification number that the EPA and your state primacy agency use to track every public water system in the country. If you operate a community water system, a school or factory with its own well, or any system that reports under the Safe Drinking Water Act, your PWSID is the number attached to every compliance record you have. It is on your monitoring schedule, your violation history, your sanitary survey, and your annual Consumer Confidence Report. This article is compliance information, not legal advice. Confirm the details that apply to your system with your state primacy agency.

What a PWSID looks like

A PWSID starts with the two letter state code followed by a string of digits, usually five to seven digits long. The letters identify the state that issued the record, and the digits identify the specific system within that state. Every public water system that reports to EPA has one, from the largest city utility to a rural association with a few dozen connections. As an example, CA5610063 is the PWSID for Camrosa Water District in Camarillo, California, a community system serving roughly 32,700 people. The number matters more than it looks: it is the key every regulator uses to pull your system's file.

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Where to find your PWSID

If you need your PWSID right now, the fastest places to look are:

  • Your annual Consumer Confidence Report, which lists the system's PWSID on the cover or header
  • Your water bill or rate notice, which often prints it in the account details
  • Correspondence from your state primacy agency, including permit letters and survey reports
  • The EPA SDWIS Federal Reporting Services portal, where you can search by system name
  • EPA ECHO's drinking water search, which shows the PWSID alongside the facility record

If none of those are handy, use a free lookup by system name. Orevant's free lookup searches the EPA SDWIS registry and returns your PWSID, system type, source water, population, and current violation status in one screen, no account required.

What your PWSID is used for

Your PWSID ties every compliance obligation to your system. Regulators use it to record monitoring results, log violations, and file public notices. You use it when you submit a lead service line inventory, apply for a compliance extension, renew an operator certification, or apply for state revolving fund assistance. Funding applications, engineering reports, and enforcement responses all reference the PWSID. When a consultant or software vendor asks which system you run, the PWSID is the unambiguous answer.

Look up any system in the United States for free

Orevant's free lookup reads the EPA SDWIS record for any public water system in all 50 states. Search by PWSID or by system name. The result shows the system's classification, population, service connections, source type, active status, and a summary of open violations with a risk score. For example, the CA5610063 record shows Camrosa as an active community water system with zero open violations at last check. The free lookup is the fastest way to see what your system's public record says before your next inspection.

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FAQ

What does PWSID stand for?

Public Water System Identification number. It is the unique identifier EPA assigns to every public water system in the Safe Drinking Water Act registry, maintained in the SDWIS database.

Is my PWSID the same as my permit number or account number?

No. The PWSID is the federal registry identifier. Permit numbers and account numbers are state or utility specific. A water bill can show either, so confirm you are reading the PWSID before you use it in a compliance filing.

Can I look up another system's PWSID?

Yes. Drinking water system records are public. EPA SDWIS and ECHO list them, and Orevant's free lookup returns any US system by name or PWSID.

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The free lookup shows the public record. The Complete System Report is $199 once and turns that record into a prioritized roadmap: what applies to your system, what is due, and the exact step to close each item.

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Orevant provides compliance information tools. Content on this page does not constitute legal advice. Compliance determinations should be verified with your state primacy agency.