| ArcGIS REST Services Directory | Login |
| Home > services > Combined_Risk (MapServer) | Help | API Reference |
| JSON | SOAP |
The aquifer risk map is being developed to fulfill requirements of SB-200 and is intended to help prioritize areas where domestic wells and state small water systems may be accessing groundwater that does not meet primary drinking water standards (maximum contaminant level or MCL). In accordance with SB-200, the risk map is to be made available to the public and is to be updated annually starting January 1, 2021. The Fund Expenditure Plan states the risk map will be used by Water Boards staff to help prioritize areas for available SAFER funding.
This layer shows the combined hazard (water quality) and exposure (drinking water users) risk for all census block groups. The combined risk of each area is based on the water quality risk combined with the density of domestic wells and state small water systems. For each census block group, the combined risk is displayed as a percentile, with higher percentiles indicating higher combined risk. Additionally, the estimated count of domestic wells and state small water systems per census block group is displayed, along with the disadvantaged/severely disadvantaged status of each census block group based on median household income data from 2018.
Methodology for the draft aquifer risk map available for download.