VerifiedBy address
Drinking Water Watch (SDWIS public portal)
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Last updatedNot stated
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state
Browse in the libraryCalifornia State Water Resources Control Board
14
100%
36%
21%
2023-03-22
VerifiedAPI · ArcGIS
Statewide lead service line inventory map
UpdatesNot stated
Last updated2026
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VerifiedAPI · CKANFree to reuse
Drinking Water: Public Water System Information (data.ca.gov)
UpdatesNot stated
Last updated2026
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VerifiedBulk fileBy address
Drinking Water: Laboratory water quality results (all samples since 1978)
UpdatesMonthly
Last updatedNot stated
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VerifiedAPI · OwnFree to reuse
SAFER Dashboard: failing and at-risk drinking water systems
UpdatesDaily
Last updated2025
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ReuseFree to reuse
VerifiedBulk file
electronic Annual Report (eAR) data
UpdatesYearly
Last updated2026
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VerifiedAPI · ArcGISBy address
California Drinking Water System Area Boundaries
UpdatesNot stated
Last updated2023-03-22
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Verified
CIWQS public reports: water quality violations and enforcement
UpdatesDaily
Last updatedNot stated
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Verified
Sanitary sewer spill data flat files (statewide SSO database)
UpdatesNot stated
Last updated2026
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Verified
Sanitary sewer spill map and interactive spill report
UpdatesDaily
Last updatedNot stated
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VerifiedBulk fileBy address
Stormwater regulatory information and water quality results (SMARTS)
UpdatesNot stated
Last updated2026
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VerifiedBulk fileFree to reuse
Beach Watch: beach advisories, closures and bacteria monitoring
UpdatesMonthly
Last updated2026
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VerifiedBulk fileStale
Urban retail water supplier conservation, supply and demand (monthly)
UpdatesMonthly
Last updated2026
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VerifiedAPI · Own
GAMA Groundwater Information System
UpdatesNot stated
Last updatedNot stated
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