What EPA Drinking Water System Data Can Show About a Community

Published September 10, 2026

Research question

What claims can public drinking-water system records support for manufactured home community research?

This brief examines only the four federal sources in the references. The unit of analysis is public-water-system records and events as defined by the selected EPA dataset. It does not use private resident, property, client, or MobileHomeBiz analytics.

Population and time window

The population is the public water systems and reported events represented in the selected Safe Drinking Water Information System records. The time window is the reporting or event period shown by the selected dataset, reviewed against the sources as available on September 10, 2026. Private wells, household taps, and records outside that published period are outside this scope.

Finding

EPA records can support carefully dated statements about an identified public water system. They do not test water at a particular tap, identify a private well, or establish a person's exposure or health outcome.

The useful conclusion is therefore conditional: a statement is supportable only when the source universe, unit, geography, reference period, and version match the question. A local decision requires the controlling property record and, where appropriate, a qualified professional or public authority.

Methodology

We opened the four primary sources listed below on September 10, 2026. For each, we logged the publishing agency, page or dataset name, direct URL, stated universe, unit, geography, reference date, update or effective date when shown, definitions, and warnings. We compared those fields before drafting any finding.

We did not calculate a new estimate, merge unmatched datasets, inspect a property, identify a resident, interpret a contract, or decide compliance, value, eligibility, safety, or causation.

Reproduction procedure

Open the first program page and record its exact title and publisher. Follow only the agency's links to the relevant data, methodology, definitions, or regulation. Save the access date and each displayed release, reference, effective, or revision date. Record filters, table numbers, geography, map layers, and download versions in words.

Create one source-log row per proposed claim. Copy the unit and universe from the documentation. Preserve missing, suppressed, estimated, preliminary, revised, and not-applicable values; do not silently treat them as zero. Ask a second reviewer to retrace the link and explain why the source fits the question.

If definitions, dates, or geographies differ, report results separately. Do not calculate a trend or difference until the comparison fields align. Label any interpretation as an inference rather than agency language.

Scope and inference boundaries

The review covers the cited public pages as available on the access date. It is a source-scope review, not a field study, legal analysis, engineering assessment, appraisal, environmental assessment, statistical reanalysis, or compliance determination.

Public program and regulatory sources describe their defined systems and rules. Survey estimates can involve sampling, weighting, imputation, revision, and disclosure controls. Administrative records depend on reporting processes. Models and maps depend on inputs, scale, assumptions, and version. None automatically describes conditions at a particular home or lot.

We make no causal inference. The sources cannot by themselves verify ownership, title, installation, structural condition, utilities, occupancy, resident circumstances, environmental exposure, insurance coverage, financing eligibility, market value, code compliance, or future outcomes.

Limitations and responsible follow-up

Web pages and downloadable records can change after the access date. Links may move, documentation can be revised, and later releases may supersede values. This review did not contact the agencies or test the completeness of their underlying administrative inputs.

For a property-specific question, match the public evidence to the relevant title, data plate, permit, installation record, inspection, survey, utility record, map determination, service report, contract, or written agency response. Resolve identifier, date, geography, and version conflicts before drawing a conclusion. Route legal, engineering, environmental, appraisal, lending, insurance, tax, health, and safety questions to qualified reviewers.

References

1. EPA drinking water data and tools
2. Safe Drinking Water Information System overview
3. Consumer Confidence Reports
4. National Primary Drinking Water Regulations

Research handoff

Preserve the question, source log, selections, definitions, version dates, limitation statement, and reviewer name. Keep extracted facts separate from interpretation. Review more MobileHomeBiz research briefs or see administrative support for recurring evidence work.