Look up a public water system's Safe Drinking Water Act (SDWA) profile and violation summary via EPA ECHO's SDW REST service
domain: echo.epa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call the getsystems endpoint (SDW Rest Services) with output=JSON and a query parameter such as p_ws_state or p_pwsid to validate the system and obtain a query ID (QID)
Pass the returned QID to get_qid to paginate through the matching water system records
Use qcolumns to select specific fields (violation counts, population served, system type) rather than pulling all default columns
For bulk export, call get_download with the QID to receive a CSV of matching systems
Cross-reference the PWSID returned against the ECHO facility search UI (mediaSelected=sdwa) to sanity-check results
Known gotchas
QIDs expire roughly 30 minutes after creation, so pagination and download calls must happen promptly after the initial getsystems call
SDWIS/Fed data reflects state-reported information and can lag actual compliance status by weeks; check the data refresh date on ECHO's About the Data page
PWSIDs are state-prefixed and not globally unique without the state code, so always qualify by state
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