Data methodology

How Water Quality Lookup handles public records.

Water Quality Lookup summarizes available public drinking-water records, source links, and local relationships. It is not a live emergency alert service, and it does not decide whether water at a specific tap is safe or unsafe.

Last updated:
Public records:
Pages summarize available records and source links, not private testing.
Not live alerts:
Annual reports and available records are historical, not emergency notice feeds.
System-first:
Public water systems are the main data entity; cities are navigation context.
Careful wording:
The site avoids broad safe or unsafe conclusions and labels incomplete data.

Available records

What data may be summarized

The site shows only fields that exist in available source-backed records. It does not fill gaps with invented values.

Water Quality Lookup organizes pages around reviewed public records. Records may include public water system identifiers, city relationships, annual report links, source notes, and summarized CCR entries.

May include

Public water systems

System names, PWSIDs, system type, source-water type, population served, service connections, and linked official sources when those fields are available.

May include

Annual reports / CCRs

Consumer Confidence Report records, report years, report summaries, related contaminants, violation references, and report-source metadata when included in the data.

May include

Contaminants in available reports

Contaminants listed in the local model or linked to available report records. A listing is not treated as a current household-level finding.

May include

Violations or notices

Historical violation or notice records when they are present in reviewed public records. These are separated from current advisories.

May include

State, city, and system relationships

Navigation relationships that help users move from a state or city to likely public water system profiles, without claiming address-level service certainty.

May include

Source and review metadata

Source name, source URL, source retrieved date, data updated date, and last reviewed date where useful.

Limitations

What the data may not include

Limitations are visible on data-heavy pages. They are part of the user experience, not fine print.

  • Not every water system may be included in the records currently available on this site.
  • Not every city has one simple water provider, and address-level service areas can vary.
  • Annual water quality reports are historical reporting documents, not real-time status pages.
  • Emergency notices, boil-water advisories, and do-not-drink instructions may not appear here.
  • The included records are not complete statewide inventories.
  • Missing data is not proof that no issue exists.

Method

How records are handled

The method is intentionally conservative: add only what can be tied to an available source, keep source context visible, and avoid claims the records cannot support.

  1. Start with the public water system.

    The site treats the public water system as the core entity because reports, violations, PWSIDs, and official source records are usually organized at that level.

  2. Keep source details close to the record.

    Records keep the source name, source URL, retrieved date, data updated date, and last reviewed date close to the information when those fields are available.

  3. Use cities and states as navigation layers.

    City and state pages help users find likely systems and official resources. They do not prove which provider serves a specific address.

  4. Separate reports, violations, notices, and alerts.

    Annual reports are historical documents. Violations and notices are records. Current advisories belong with official utility or government alerts.

  5. Label incomplete data plainly.

    Water Quality Lookup organizes pages around reviewed public records. Records may include public water system identifiers, city relationships, annual report links, source notes, and summarized CCR entries.

  6. Include only records that can be explained.

    A record needs enough source context to help a reader understand what is shown, what is missing, and where the original information came from.

    When a record does not have enough source support, it is left out of public navigation or the limitation is stated clearly.

Source details

Details used to explain records

These source and freshness details explain where public records came from and when they were reviewed.

Source name
The source or dataset name shown near a record when available.
Source link
A direct official or supporting source URL when the record includes one.
Date retrieved or checked
The date the source was retrieved or checked for the record.
Data updated date
The date the record was last updated.
Last reviewed date
The date the page or record was last reviewed for source context and public clarity.
Known limitation
A note about missing, historical, incomplete, or source-limited data when needed.

Interpretation

Reports, records, notices, and alerts are different

These distinctions help users understand a record without treating every item as a current emergency.

Annual report / CCR

A yearly reporting document for a community water system. It can summarize a reporting period, but it is not a live water-status page.

Public record

A record from a utility, state agency, EPA resource, or available source document. Records can lag current conditions.

Violation or notice

A compliance or public-notice record described with its date, status, source, and context. It is not automatically a current advisory.

Current advisory or alert

A live or urgent instruction from a utility, city, state agency, health department, or other official source. Users need official current alerts for urgent decisions.

Current concerns

How users verify urgent or personal questions

This site can help users find records and source links. It is not the authority for current instructions or individual medical decisions.

  • Check the public water system or utility website listed on your bill.
  • Check city, county, or state drinking-water authority pages for current notices.
  • Use EPA or state public water system resources where appropriate.
  • For urgent or current advisories, follow official utility, local, or state alert instructions.
  • For personal health questions, consult a qualified health professional.

Editorial standards

How the site talks about risk and uncertainty

Water information can affect health and household decisions, so the site uses conservative public-interest wording.

  • No broad safe or unsafe claims.
  • No personal medical advice.
  • No implied emergency dashboard or current-alert promise.
  • No invented report links, source links, or missing-data values.
  • Clear labels for historical, incomplete, or source-limited records.
  • Preference for public source transparency over false certainty.

Next steps

Related pages

Use these paths to move from methodology to browse pages and related trust pages.

Homepage

Start from the national entry point for system, state, contaminant, guide, and trust paths.

View Homepage

Guides index

Use guides for report-reading and source-interpretation workflows.

View Guides index

Trust policies

Policy and trust pages

These pages explain privacy, terms, corrections, advertising, sources, methodology, and limitations.

About

What Water Quality Lookup is, what it is not, and how coverage is limited.

View About

Contact

How to reach the site for publisher questions, source tips, and corrections.

View Contact

Privacy

How contact email, Google Tag Manager, and site measurement are handled.

View Privacy

Editorial Policy

How source-backed records, risk language, corrections, and ads are separated.

View Editorial Policy

Corrections Policy

How suggested corrections are reviewed against public or official sources.

View Corrections Policy

Advertising Policy

How ads may be used without changing source methodology or water-safety language.

View Advertising Policy

Data Sources

Source categories, source limits, and what source details may appear on pages.

View Data Sources

Limitations

What the site can and cannot determine from public records.

View Limitations

Suggest an Update

Send source-backed correction details or missing-record notes by email.

View Suggest an Update