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California Drinking Water System Area Boundaries
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Last updated2023-03-22
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Water · California
Filter and exportWater records for California
51 official water sources published in California, from California State Water Resources Control Board, US Geological Survey and US Environmental Protection Agency and 13 more, plus 11 that cover it from above. Each links to the original, with its update rate and whether we've opened it.
51
100%
33%
11
Published in California
VerifiedAPI · SocrataFree to reuse
City of LA storm drain system (pipes and inlets)
UpdatesNot stated
Last updated2024-11-29
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Daily State Water Project reservoir elevation and storage
UpdatesMonthly
Last updated2026
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Drinking Water: Public Water System Information (data.ca.gov)
UpdatesNot stated
Last updated2026
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GAMA Groundwater Information System
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Last updatedNot stated
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LA County beach water quality advisories, rain advisories and closures
UpdatesWeekly
Last updated2026
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LADWP water outage map
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Last updatedNot stated
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LADWP Water Supply in Acre Feet (open data)
UpdatesNot stated
Last updated2019-01-29
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SAFER Dashboard: failing and at-risk drinking water systems
UpdatesDaily
Last updated2025
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San Francisco Flood Health Vulnerability (San Francisco)
UpdatesWhen it changes
Last updated2016-03-25
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VerifiedAPI · ArcGIS
Statewide lead service line inventory map
UpdatesNot stated
Last updated2026
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Stormwater capture by method and by fiscal year (open data)
UpdatesLive or continuous
Last updated2020-02-11
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Stormwater inlets, drains and catch basins (San Francisco)
UpdatesDaily
Last updated2026-10-23
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USGS gauge 11092450: Los Angeles River at Sepulveda Dam
UpdatesLive or continuous
Last updated2026-08-25
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USGS Water Data API: Monitoring locations and time-series metadata
UpdatesLive or continuous
Last updatedNot stated
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Water main breaks / water leaks per month (open data)
UpdatesNot stated
Last updated2018-02-08
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Water Quality Portal (USGS NWIS + EPA WQX/STORET + USDA STEWARDS)
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Last updatedNot stated
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Beach Watch: beach advisories, closures and bacteria monitoring
UpdatesMonthly
Last updated2026
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City of San Diego drinking water quality reports
UpdatesYearly
Last updatedNot stated
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CIWQS public reports: water quality violations and enforcement
UpdatesDaily
Last updatedNot stated
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Drinking Water Quality Report web summary (dwqr.ladwp.com)
UpdatesYearly
Last updated2025
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Drinking Water Watch (SDWIS public portal)
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Last updatedNot stated
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Drinking Water: Laboratory water quality results (all samples since 1978)
UpdatesMonthly
Last updatedNot stated
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DWR Urban Water Data: drought planning and management
UpdatesNot stated
Last updated2025
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EBMUD drinking water quality (Oakland)
UpdatesYearly
Last updatedNot stated
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electronic Annual Report (eAR) data
UpdatesYearly
Last updated2026
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EPA ECHO ICIS-NPDES discharge permits and effluent violations
UpdatesWeekly
Last updatedNot stated
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EPA ECHO Safe Drinking Water Act (SDWA) national dataset
UpdatesQuarterly
Last updatedNot stated
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LA County Public Works hydrologic data: stream gauges and well measurements
UpdatesNot stated
Last updatedNot stated
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LA County Public Works near real-time precipitation (ALERT rain gauges)
UpdatesLive or continuous
Last updatedNot stated
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LA County Waterworks Districts water service line inventory
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Last updatedNot stated
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LA's Drinking Water Quality Report (annual Consumer Confidence Report)
UpdatesYearly
Last updated2025
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LADWP 2025 Urban Water Management Plan and Water Shortage Contingency Plan
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Last updated2026
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LADWP 2026-27 water supply forecast (Eastern Sierra snow survey)
UpdatesYearly
Last updated2026
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LADWP lead service line inventory statement
UpdatesNot stated
Last updated2024
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LADWP local groundwater basins and contamination plume maps
UpdatesNot stated
Last updated2015
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LADWP newsroom: boil-water notices and water incident updates
UpdatesNot stated
Last updated2025
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LADWP Turf Replacement Rebate and SoCal Water$mart rebates
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Last updatedNot stated
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LADWP water rate schedules (A to F) and tier allotments
UpdatesNot stated
Last updated2016
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Monitoring of Indicator Bacteria in Drinking Water (San Diego)
UpdatesDaily
Last updated2026-10-19
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Monitoring of Select Chemical Parameters in Water Distribution System (San Diego)
UpdatesDaily
Last updated2026-10-19
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Monitoring of Select Chemical Parameters in Water Treatment Plant Effluents (San Diego)
UpdatesDaily
Last updated2026-10-19
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Regional Phase I MS4 stormwater permit (Order R4-2021-0105)
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Last updatedNot stated
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Sanitary sewer spill data flat files (statewide SSO database)
UpdatesNot stated
Last updated2026
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Sanitary sewer spill map and interactive spill report
UpdatesDaily
Last updatedNot stated
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SFPUC water quality (San Francisco)
UpdatesYearly
Last updatedNot stated
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State Water Project allocation and Notices to Contractors
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Last updatedNot stated
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Stormwater regulatory information and water quality results (SMARTS)
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Last updated2026
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Urban retail water supplier conservation, supply and demand (monthly)
UpdatesMonthly
Last updated2026
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Water Conservation Ordinance: watering days, phase and fines
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Last updatedNot stated
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Water Quality - Ocean Monitoring Program (San Diego)
UpdatesWhen it changes
Last updated2026-08-11
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Covering California from above
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SDWIS drinking water systems and violations (Envirofacts)
UpdatesNot stated
Last updated2026-04-14
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UCMR occurrence data (UCMR 1-5, incl. PFAS and lithium in UCMR 5)
UpdatesNot stated
Last updated2026-10-15
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Service Line Inventory dashboard (lead, galvanized, unknown lines)
UpdatesQuarterly
Last updatedNot stated
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Legacy NWIS WaterServices (waterservices.usgs.gov) - retiring
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Last updatedNot stated
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ATTAINS impaired waters (Clean Water Act assessments)
UpdatesNot stated
Last updated2025-12-30
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U.S. Drought Monitor statistics web service
UpdatesWeekly
Last updatedNot stated
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NOAA National Water Prediction Service (NWPS) API
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Last updatedNot stated
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VerifiedAPI · ArcGISBy address
FEMA National Flood Hazard Layer (NFHL) - effective
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Last updatedNot stated
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GloFAS river discharge forecasts (Global Flood Awareness System)
UpdatesDaily
Last updated2026-10-17
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WRI Aqueduct 4.0 water risk data
UpdatesWhen it changes
Last updated2023-08-16
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WHO/UNICEF JMP drinking water, sanitation and hygiene
UpdatesWhen it changes
Last updatedNot stated
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