Our Data Sources
The public datasets behind every finding, and how fresh they are. Every report keeps the relevant publisher, dates, units, qualifiers, and evidence identifiers attached to the finding.
4 published source classes7 source recordsPolicy status Published
Every public record PurityMap currently reads, most relied on first. Open a record for its coverage, limitations and update history.
7 records, 4 source classes
- UCMR5 Analytical Results2024
Fifth Unregulated Contaminant Monitoring Rule (UCMR5) — PFAS occurrence data
U.S. Environmental Protection Agency · U.S. public water systems in the fifth UCMR monitoring cycle · sampling year 2024
Findings citing this record17,203
- State SDWIS Compliance Record2024
Safe Drinking Water Information System (SDWIS) — Lead & Copper Rule 90th-percentile results
U.S. Environmental Protection Agency · U.S. public water systems · Lead & Copper Rule monitoring (records since 1992)
Findings citing this record4,057
- State SDWIS Compliance Record2026
Safe Drinking Water Information System (SDWIS) — Violations & Enforcement records
U.S. Environmental Protection Agency · U.S. public water systems · SDWA violations and enforcement actions, 2026Q2 national download
Findings citing this record294
- Consumer Confidence Report (CCR)2025
Utility Consumer Confidence Reports (CCR) — disinfection by-products and hardness
Individual public water utilities · Individual utilities' annual Consumer Confidence Reports · 2025
Findings citing this record235
- State SDWIS Compliance Record2023
SDWIS Lead & Copper Rule — 2021–2023 monitoring round
U.S. Environmental Protection Agency / Arizona Department of Environmental Quality · Single public water system · Lead & Copper Rule monitoring 2021–2023
Findings citing this record1
- State SDWIS Compliance Record2024
SDWIS Lead & Copper Rule — 2022–2024 monitoring round
U.S. Environmental Protection Agency · Single public water system · Lead & Copper Rule monitoring 2022–2024
Findings citing this record1
- State SDWIS Compliance Record2026-07-09
Safe Drinking Water Information System (SDWIS) — Public Water Systems inventory
U.S. Environmental Protection Agency · U.S. public water systems · SDWA_PUB_WATER_SYSTEMS, 2026Q2 national download
Findings citing this recordNot counted
The classes describe the governed source categories, not a claim that every system has every source. Individual report pages list the documents actually used.
What stays attached to a finding
Six fields travel with every value, from the source file to the page you read. If one is missing, the finding says so.
- Source document and publisherUS EPA SDWIS · State SDWIS Compliance Record
- Sampling and publication datesSampled 2024 · published 2026-07-09
- Sampling-location contextNot stated in this record
- Reported unit and qualifierµg/L · qualifier “=”
- Reporting limit when availableNot stated in this record
- Evidence and source identifiersPWSID NY7003493 · src-sdwis-lcr
Three clicks from a number to its source.
- 01
Start with a report
Resolve the supplier serving a place and open its published water record.
- 02
Read the finding
Check the sample date, unit, qualifier, benchmark, and evidence state.
- 03
Open the source
Use the linked evidence or source record to inspect provenance and limitations.
Freshness
Each finding carries its own sampling and publication dates. Where a system’s record is stale or sparse, we say so rather than filling the gap.