Karla Flemmings and her dog Princeton visit Candlestick Point every morning, the shoreline just across from the old San Francisco 49ers stadium.
"I come out here to get some solitude and walk with the dog," said Flemmings.
But the beach could use a good cleaning. Lurking below the water's surface is enough toxins to land the beach on the top 10 list of most polluted beaches in California.
"Windsurfer Circle at Candlestick Point is our number 10 'beach bummer' as one of your most polluted beaches in the state," said Amanda Griesbach, water quality scientist.
This doesn't surprise Flemmings; she has noticed glass on the shoreline. Scientists speculate the storm drain from the stadium could be contributing to the beach's poor water quality. Both agree-something needs to be done.
"I would love for some environmental action group to clean up. I know there are a lot of people who would volunteer, I know I would come out here and help," said Flemmings.
"It's just really to bring awareness to the public and to the local agencies that maybe there is a potential problem," said Griesbach.
One San Francisco beach that makes the honor roll is Crissy Field. This comes as no surprise to people who cherish this spot.
"This is a wonderful resource to have right in the city and I think it's a wonderful preserved area and a fabulous recreation area," said Diane Parish, Sausalito resident.
Heal the Bays list of most polluted shorelines in California:
1. Cowell Beach at Wharf (Santa Cruz County)
2. Marina Lagoon (San Mateo County)
3. Marina del Rey Mother's Beach (Los Angeles County)
4. Cabrillo Beach harbor side (Los Angeles County)
5. Stillwater Cove (Monterey County)
6. Clam Beach County Park (Humboldt County)
7. Santa Monica Pier (Los Angeles County)
8. Pillar Point Harbor (San Mateo County)
9. Capitola Beach west of jetty (Santa Cruz County)
10.Windsurfer Circle (San Francisco County)