Islais Creek

San Francisco, California
Managed by The Swim Guide

Islais Creek is a small creek running east out of San Francisco, into San Francisco Bay. The creek used to be the largest waterbody in the city, but over time was reduced to a channel. Islais Creek is situated near the Southeast Wastewater Treatment Plant and is frequently contaminated with sewage and stormwater. Combined sewer overflows and sewage bypasses are an ongoing issue here. Recently, efforts are underway to restore the creek as part of plan to reclaim the waterfront. The future of Islais Creek at a recreational waterway for people to enjoy is looking up!

WATER QUALITY
  • Failed to meet water quality standards
  • Current Status
  • This status is based on the latest sample, taken on October 18th, 2018. The Swim Guide updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at
For water quality icon legend, click:   
MONITORING FREQUENCY

Islais Creek is sampled weekly from January 1st to December 31st

SOURCE INFORMATION

San Francisco Shoreline Beach Monitoring Program is a cooperative effort between Public Health Utilities Commission and the SanFrancisco Department of Public Health. Samples are collected year round, on a weekly basis and tested for 3 different bacterial indicators. Levels of total coliform, E.coli and enterococcus are analyzed by the quanti-tray method.

Results are posted 18 - 24 hours after the samples are received by the laboratory. Health officials proactively notify the public and post and de-post beaches based upon preliminary results. Signs are posted at the beach in accordance with California standards and when a Combined Sewer System discharge occurs. Daily testing will occur and postings will remain until the discharge ceases and all bacteria levels drop below the following standards.

The standards for indicator bacteria are as follows:
Total Coliform > 10,000 MPN (Most Probable Number) / 100 ml of water
E.coli > 400 MPN / 100 ml
Enterocococcus > 104 MPN / 100 ml

A beach is marked Green when the levels of 2 or more types of indicator bacteria are less than state standards.

A beach is marked Red when the levels of more than one type of indicator bacteria at a single station are above state standards or when one or more indicator bacteria levels exceed at each of two linked stations. If one or more of the indicator bacteria levels are above the state standard in a repeat sample the beach will remain posted until all 3 indicators are below state standards.

A beach is marked Grey when there is no current or reliable monitoring information available.

Swim Guide checks daily for the latest results. Swimmers are encouraged to stay out of the water during heavy rainfall and up to 48 hours after.

WATER QUALITY GRAPH

Islais Creek

San Francisco, California
Managed by The Swim Guide

WATER QUALITY
  • Failed to meet water quality standards
  • Current Status
  • This status is based on the latest sample, taken on October 18th, 2018. The Swim Guide updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at
For water quality icon legend, click:   

Islais Creek is a small creek running east out of San Francisco, into San Francisco Bay. The creek used to be the largest waterbody in the city, but over time was reduced to a channel. Islais Creek is situated near the Southeast Wastewater Treatment Plant and is frequently contaminated with sewage and stormwater. Combined sewer overflows and sewage bypasses are an ongoing issue here. Recently, efforts are underway to restore the creek as part of plan to reclaim the waterfront. The future of Islais Creek at a recreational waterway for people to enjoy is looking up!

MONITORING FREQUENCY

Islais Creek is sampled weekly from January 1st to December 31st

SOURCE INFORMATION

San Francisco Shoreline Beach Monitoring Program is a cooperative effort between Public Health Utilities Commission and the SanFrancisco Department of Public Health. Samples are collected year round, on a weekly basis and tested for 3 different bacterial indicators. Levels of total coliform, E.coli and enterococcus are analyzed by the quanti-tray method.

Results are posted 18 - 24 hours after the samples are received by the laboratory. Health officials proactively notify the public and post and de-post beaches based upon preliminary results. Signs are posted at the beach in accordance with California standards and when a Combined Sewer System discharge occurs. Daily testing will occur and postings will remain until the discharge ceases and all bacteria levels drop below the following standards.

The standards for indicator bacteria are as follows:
Total Coliform > 10,000 MPN (Most Probable Number) / 100 ml of water
E.coli > 400 MPN / 100 ml
Enterocococcus > 104 MPN / 100 ml

A beach is marked Green when the levels of 2 or more types of indicator bacteria are less than state standards.

A beach is marked Red when the levels of more than one type of indicator bacteria at a single station are above state standards or when one or more indicator bacteria levels exceed at each of two linked stations. If one or more of the indicator bacteria levels are above the state standard in a repeat sample the beach will remain posted until all 3 indicators are below state standards.

A beach is marked Grey when there is no current or reliable monitoring information available.

Swim Guide checks daily for the latest results. Swimmers are encouraged to stay out of the water during heavy rainfall and up to 48 hours after.

WATER QUALITY GRAPH



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