2022 Bacteria Monitoring Data

2022 Bacteria Monitoring Stats

62 sites, 711 water samples,
20 trained volunteers

2022 Bacteria Sampling Data

Weekly Monitoring Data Maps
Westchester, NY & Greenwich, CT pdf xls
Queens & Nassau Counties pdf xls
Summary by Site pdf xls
Quality Assurance Project Plan pdf

Map Legend

Quick Links

Best and Worst
Summary of Findings
Action Items


Select Year: 2023202220212020201920182017201620152014

Fecal Bacteria Monitoring

In 2022, Save the Sound collected and tested water quality from Greenwich, CT, through Westchester County, to Queens, and into Nassau County. Samples were analyzed for fecal indicator bacteria Enterococcus in marine water and E.coli in freshwater, which are used to determine if waters are safe for swimming. Click on each site on the map above to see what we found. The colors reflect average bacteria levels at each site. The “% Pass” and “% Fail” show how many samples passed or failed the single sample criteria for safe swimming in New York and Connecticut.

State Criteria for Safe Swimming

Samples greater than 104 CFU/100 mL Enterococcus are considered unsafe for swimming in marine water. Samples greater than 235 CFU/100 mL E. coli are considered unsafe for swimming in fresh water.

A weighted average (geometric mean) greater than 35 CFU/100 mL Enterococcus is considered unsafe for swimming in marine water and greater than 126 CFU/100 mL E. coli is considered unsafe for swimming in fresh water.

Summary of Findings

Overall Failure Rates Increase

Overall fecal contamination rates increased slightly from 2021 to 2022 from 54% to 56%, respectively. An increase of 3% in dry weather failures occurred this year from 2021. Wet weather failure rate increased by 15%.

Failure is based on safe swimming criteria used in Connecticut and New York to monitor and manage beaches. Because wet weather causes pollution to flush off the landscape and into the waterways, and can trigger overflows of untreated sewage, Save the Sound reports on wet weather samples separately. This year, as in all past years, fecal contamination was higher after rainfall at most locations.

River Sites Show Decline

Rivers remain the most polluted sites in 2022. There was a collective increase of 5% in failure rate in rivers compared to 2021. There is still much work to be done to clean up these waterways. Many of these rivers running through our communities are carrying an unacceptable level of fecal contamination which poses a risk to human health.

Best and Worst of 2022

Three of the locations in the monitoring effort this year did not have one failing sample. There were 12 locations that failed every time they were sampled.

Be a Part of the Solution

As long as rivers, streams, and our coastline are still polluted, Save the Sound remains committed to restoring water quality where people swim, fish, and paddle. Save the Sound encourages all members of the public to be on the lookout for water pollution and report anything they see to their local health authorities and to Save the Sound at pollution@savethesound.org.

  • ​Everyone can help reduce sewage pollution sources simply by conserving water, which will lessen the wear-and-tear on our water infrastructure and reduce sewage overflows by lowering the volume of water in the system.
  • Homeowners need to repair the sewer lines that connect homes and businesses to municipal sewers, or maintain their septic systems.
  • Dog owners should put pet waste in the trash, never in a catch basin or on the street.
  • Every community and homeowner should work on strategies like creating rain gardens to help reduce runoff.
  • If you see sewage overflowing in your community, please let us know by sending a photograph or video plus the time and location of the overflow to pollution@savethesound.org.

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Sunday, Oct. 1 at 4 p.m.
2023 Annual Meeting Join us at the Larchmont Yacht Club in New York as we celebrate achievements, explore a greener future, and enjoy the view of Long Island Sound with refreshments in hand.

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