Select location
Zoom to county: 
  • Alameda
  • Alpine
  • Amador
  • Butte
  • Calaveras
  • Colusa
  • Contra Costa
  • Del Norte
  • El Dorado
  • Fresno
  • Glenn
  • Humboldt
  • Imperial
  • Inyo
  • Kern
  • Kings
  • Lake
  • Lassen
  • Los Angeles
  • Madera
  • Marin
  • Mariposa
  • Mendocino
  • Merced
  • Modoc
  • Mono
  • Monterey
  • Napa
  • Nevada
  • Orange
  • Placer
  • Plumas
  • Riverside
  • Sacramento
  • San Benito
  • San Bernardino
  • San Diego
  • San Francisco
  • San Joaquin
  • San Luis Obispo
  • San Mateo
  • Santa Barbara
  • Santa Clara
  • Santa Cruz
  • Shasta
  • Sierra
  • Siskiyou
  • Solano
  • Sonoma
  • Stanislaus
  • Sutter
  • Tehama
  • Trinity
  • Tulare
  • Tuolumne
  • Ventura
  • Yolo
  • Yuba

Show counties
Refresh Map  |  Zoom To Data

 Loading Map ...

Contaminant Data

This interactive map allows you to explore fish contaminant data for your fishing locations. Data are available from extensive monitoring by SWAMP of lakes and reservoirs in 2007 and 2008, of the coast in 2009 and 2010, of rivers and streams in 2011, and from other studies. Data from 2007-2014 are shown by default. Map Instructions Hide
  • Select parameters of interest from the menus below and click on the "Go" button. The map will display average concentrations for the selected water bodies.
  • To view data for all species at your water body, trends, or comparisons with nearby water bodies, click on a map location or select a water body from the menu above the map.
  • Enter your own threshold or modify thresholds displayed on the map by clicking the Change Thresholds link in the map legend.
  • Markers are general representations of sampling locations, not the precise locations where fish were caught.
  • Circles indicate lake and reservoir sampling locations. Triangles indicate coast sampling locations. Diamonds indicate river and stream sampling locations.

Select Species:

Select Contaminant:

Select Start Date:

Select End Date:

Go Reset

More Information

This map shows data generated by:

What are the most recent data for my location?

What are the trends at my location?

How does my location compare to nearby water bodies?