Monitoring and analyzing water quality and sharing the results so we can make informed decisions for the river and ourselves.

Since 2006, Riverkeeper has sampled the waters along the length of the Hudson River from the Battery in New York City to Newcomb in Adirondack National Park, encompassing the Hudson River Estuary and eighteen tributaries.

Riverkeeper’s water quality data collection effort has been foundational to a movement that now includes dozens of labs and volunteers spread across hundreds of monitoring sites. Our network of community groups, individuals, academic institutions, and nonprofit organizations collects and tests water from the Hudson and its tributaries to identify patterns of contamination, inform decision-making about public recreation, and advocate for water quality improvements.

From May to October each year, our Science team utilizes Riverkeeper’s boat to collect water samples at more than 77 sites each month. We test the samples for salinity, dissolved oxygen, temperature, turbidity, pH, chlorophyll, dissolved organic matter, nitrate, and fecal indicator bacteria Enteroccoci in the main stem of the Hudson. Working with our volunteer network, we collect hundreds more samples in the tributaries and measure similar parameters at our water quality laboratory. Data collection helps us understand the health of the Hudson, its safety as a source of drinking water, as well as the impacts of climate change on the system and how environmental justice communities in the watershed are impacted by pollution.

All of the data is posted on our publicly available Water Quality Data Portal.

We also work regularly with colleges, universities, municipalities, and regulators to collect additional water quality data to understand the sources and occurrence of contaminants of emerging concern, conduct microbial source tracking to better understand where fecal indicator bacteria or nutrient pollution is coming from, and collect data that can be used for regulatory purposes.

Our monitoring program is a reminder that the health of the river is connected to our own health, and in caring for the river we care for all of those who depend on it.

You might be surprised to learn that fecal indicator bacteria levels in the Hudson do not exceed unsafe levels in most of the Hudson most of the time. However, factors such as boating traffic, currents, tides, and weather events, especially precipitation events that overwhelm infrastructure and result in untreated sewage releases or in large amounts of polluted urban and agricultural runoff, can make open water swimming unsafe. In general, we recommend that beachgoers, swimmers, boaters, and kayakers avoid substantial contact with the Hudson River and New York City waterways after heavy rains.

As part of an effort to increase coordination and cooperation around water quality monitoring throughout the Hudson River watershed, Riverkeeper created the Hudson River Water Quality Monitoring Collaborative. The Collaborative is composed of over 100 stakeholders including academics, regulators, municipalities, watershed groups, and environmental justice groups, and is designed to facilitate sharing of knowledge, expertise, and resources in order to identify and address the most pressing issues facing the watershed; discuss opportunities for novel monitoring strategies; and provide feedback that we use to improve our monitoring program and make sure it is responsive to current and future threats.

In 2021, Riverkeeper and Media Sanctuary launched the Water Justice Lab, a project in North Troy that established a water quality sampling lab that trains young students from this underserved community in both laboratory science and media skills in order to shed light on environmental justice issues in the Hudson River watershed. Water Justice Fellows participate in an eight-week long field trip-based course called Source to Estuary, where they learn about their local water systems and create media (radio, photography, video) about what they learn. Partnering with the Kingston YMCA Farm Project, students also learn about the connections between water, agriculture, and environmental sustainability.

Riverkeeper provides equipment, resources, education, training, mentorship, and field experience for the Water Justice Fellows to analyze water quality samples that they collect in their community.