Water system supply relationships and quality observations
Data Stockroom, a product of LaunchNav LLC — 100-row sample

Captured SDWIS water-system inventory and reported supply relationships with qualified UCMR5 analyte observations, Lead and Copper Rule results, recent compliance-period enforcement rows and geographic/service references.

Processed on: 2026-10-04
Period: ASOF2026-10-03 (as of 2026-10-03)
Primary source snapshot: 2026-10-03

CONTENTS
sample.csv: 100 real rows, all 49 columns from water_systems.csv.
Repeatable selection; not a statistically representative sample. The legend describes the full product; companion data tables are only in the full download.

FEATURES AND PREPARATION
- Complete captured system population, retaining active/inactive and community/noncommunity classifications.
- Qualified PFAS and lithium observations preserve nondetects, reporting levels, units and sample identifiers.
- Supply relationships, facility records, geographic areas and violation/enforcement records stay separate.

SOURCES AND ATTRIBUTION
U.S. Environmental Protection Agency — SDWIS and UCMR5 — SDWIS 2026Q2 captured inventory and EPA final UCMR5 occurrence data released August 2026 (July 2026 summary document)
https://echo.epa.gov/tools/data-downloads/sdwa-download-summary
System, supply, compliance and monitoring facts Attribution: Credit: U.S. Environmental Protection Agency, SDWIS and UCMR5 occurrence data. No endorsement implied.

USING THE FILES
legend.csv defines the columns, units, formats and blank-value meanings.
CSV is UTF-8 with headers. Import identifiers, ZIP codes and phones as text. Blank differs from zero or false.
LICENSES.txt contains source attribution and applicable notices.

LIMITATIONS
- Source capture is a dated snapshot; monitoring dates and SDWIS reporting quarters differ.
- No captured observation does not mean clean water; a nondetect is not zero.
- UCMR5 occurrence monitoring is not a regulatory compliance finding or household exposure estimate.
- Violation/enforcement rows cover compliance or noncompliance periods beginning in 2020 onward; multiple actions can repeat violations.
- Reported seller relationships can represent emergency or seasonal availability; they do not establish actual flow.
- System administrative person names, emails and freeform additional-element text are withheld.
- The inventory includes inactive and other reported activity codes; primary row count is not a count of currently operating systems. UCMR systems absent from this inventory remain in the observation table.
- SDWIS codes retain their source values. Decode them with reference_codes.csv using value_type and value_code together. Field definitions: https://echo.epa.gov/tools/data-downloads/sdwa-download-summary.

DATA STOCKROOM TERMS
- This is a dated data snapshot. It does not include an ongoing update service.
- The files are supplied as-is. Accuracy, completeness, contact reachability and suitability for a particular use are not guaranteed. Independently verify information needed for your use.
- Underlying source data remains subject to the included upstream licenses and notices. Those terms govern that material; these terms do not restrict upstream permissions or rights in public-domain information.
- Data Stockroom does not claim agency endorsement or exclusive ownership of underlying public facts. A published contact does not establish consent to marketing.

Support: hello@datastockroom.com
