Data

1. Select a site type.
   1. Drinking Water Sources
      • Choose a PFAS compound or group of compounds to color-code the map by concentration.
   2. Choose “Exceeding Maximum Contaminant Level” to display water sites where contaminants are above the PFAS National Primary Drinking Water Regulation guidelines.
   3. Deposition
      • Select wet deposition sites to see PFAS rainwater data.
      • Select dry deposition sites to see PFAS in free-falling particulate matter.
   4. Ambient Air
      • Select to see PFAS in air samples.
2. Click on a site icon on the map or jump to a site to view PFAS data from that site.
3. Select About this Graph to learn more about the data you are viewing.

What is an MCL?

• The highest level of a contaminant legally allowed in a drinking water source.
• A guideline to minimize health risks based on peer-reviewed science and feasible implementation.
• A quantity above which public water system will be required to reduce the amount of contaminant in their water.

Why are the PFOA and PFOS MCLGs different than MCLS?

• MCLGs are non-enforceable health-based goals while MCLs are enforceable levels.
• The EPA MCLGs of zero for PFOA and PFOS indicate that there is no level of exposure to these chemicals without risk of health impacts.
• The PFOA and PFOS MCLs of 4.0 ppt represent the lowest level of these PFAS in our drinking water to reduce exposure that is feasible for effective implementation.

What if a site near me is above the MCL?

• Please note that the data available on our website represents samples that were collected prior to the establishment of the MCLs.
• Consider checking your local public utility page for more recent testing of your drinking water supply and updates on actions taken to reduce PFAS levels in your water.

• Collaboratory AFFF Final Report: April 15, 2021
• Firefighting Foam Inventory Survey Data