Query California's Online System for Well Completion Reports (OSWCR) index via the data.ca.gov CKAN open-data platform to pull well completion records for a county or area
domain: data.ca.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Locate the 'Well Completion Reports' dataset at https://data.ca.gov/dataset/well-completion-reports (mirrored at data.cnra.ca.gov, published by CA Dept. of Water Resources)
Use CKAN's datastore_search API (per data.ca.gov's own linked CKAN 2.9 API docs) against the main Well Completion Reports CSV resource to retrieve records
Filter by county, township/range/section, or planned-use code since most records carry only PLSS-section-level location precision, not exact wellhead coordinates
Cross-reference matches against the separate 'Well Completion Report PDF Links' resource to pull the original scanned report for verification
Treat every attribute as provisional until checked against the source PDF, per DWR's own dataset disclaimer
Known gotchas
This is an informational index only, not the legal record of well construction — DWR explicitly says all values must be verified against the original Well Completion Report
Known data-quality issues include missing/duplicate records and incorrect latitude, longitude, record type, planned use, or total completed depth
Dataset refresh cadence is weekly per its own metadata — do not assume a well drilled in the last few days will already appear
Give your agent this knowledge — and 15,500+ more routes
One MCP install gives any agent live access to the full route map across 5,700+ domains, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp
Need this verified for your stack — or a route we don't have yet?