Explore map
1. Choose your drinking water contaminant of interest
- Use the tabs above the map to choose a specific contaminant
2. Adjust the options of the map
- Select year (from 1999-2017) below the map
- Select summary unit of drinking water contaminant levels (annual mean or maximum) above the map on the left
3. Select your geographic region of interest
- Type in the name of a county, city, or zip code above top right corner of the map and click the magnifying glass to zoom to that region
- Use the zoom feature in the bottom right corner of the map and drag the map to your area of interest
- Click 'Zoom CA' to return the map extent to the entire state of California
4. View information for specific community water system
- Click on an individual dot to view information about that water system
- If cursor is an arrow instead of a hand, this means the map is still loading
Explore state-level time series chart
1. Scroll down to the chart displayed below the map
- Chart will display data for whichever contaminant has been selected for the map
- Change the contaminant using the tabs above the map
2. Adjust the options of the chart
- Select summary unit of drinking water contaminant level (annual mean or maximum)
- Select unit of measuring impact (number of community water systems or number of people served by community water systems)
3. View specific data points
- Hover over specific contaminant level range above the chart to highlight the graph line that corresponds with that range (ND indicates non detectable levels)
- Hover over point on chart to view data for a given year
- Switch to table view to see all values