Additional findings and reports
Supplemental to the Riverkeeper Water Quality Portal
April 15, 2026
Riverkeeper Team
These reports from Riverkeeper and our partners add to the context and historical data in the Riverkeeper Water Quality Portal:
Past Riverkeeper water quality reports
Hudson River tributaries water quality results 2025, 2021-2025
Riverkeeper tributary monitoring report, 2024
Hudson River water quality best and worst through October 2023, 2020-2023
Saw Mill River entero water quality monitoring results, 2015-2022
Catskill Creek entero water quality monitoring results, 2012-2022
Catskill Creek E.coli water quality monitoring results, 2021-2022
Creek entero water quality monitoring results, 2012-2022
Esopus Creek E.coli water quality monitoring results, 2021-2022
Mohawk River entero water quality monitoring results, 2015-2022
Mohawk River E.coli water quality monitoring results, 2016-2022
Pocantico River entero water quality monitoring results, 2012-2022,
Rondout Creek entero water quality monitoring results, 2012-2022
Upper Hudson River entero water quality monitoring results2016-2022
Wallkill River entero water quality monitoring results, 2012-2022
Wallkill River E.coli water quality monitoring results, 2021-2022
Sparkill Creek community water quality monitoring results, 2012-2021
Water quality over time in the Hudson’s major tributaries, 2012-2021
Water quality over time in lower Hudson tributaries, 2012-2021
Water quality over time in the mid-Hudson tributaries, 2012-2021
Water quality over time in the Mohawk & upper Hudson Rivers, 2015-2021
Water quality over time in the Rondout Creek & Wallkill River, 2012-2021
Roeliff Jansen Kill community water quality monitoring results, 2016-2019
Bronx River community water quality monitoring results, 2017-2018
Saw Kill community water quality monitoring results, 2016-2018
Community water quality monitoring - Tributary comparison report, 2018
How’s the water? A snapshot for the mid-Hudson
How’s the water? A snapshot for the lower-Hudson
How’s the water? A snapshot for New York City
How’s the water? A snapshot for the Mohawk
How’s the water? 2014 report, 2014
How’s the water? 2012 report, 2012
Riverkeeper tributary monitoring report, 2024
Hudson River water quality best and worst through October 2023, 2020-2023
Saw Mill River entero water quality monitoring results, 2015-2022
Catskill Creek entero water quality monitoring results, 2012-2022
Catskill Creek E.coli water quality monitoring results, 2021-2022
Creek entero water quality monitoring results, 2012-2022
Esopus Creek E.coli water quality monitoring results, 2021-2022
Mohawk River entero water quality monitoring results, 2015-2022
Mohawk River E.coli water quality monitoring results, 2016-2022
Pocantico River entero water quality monitoring results, 2012-2022,
Rondout Creek entero water quality monitoring results, 2012-2022
Upper Hudson River entero water quality monitoring results2016-2022
Wallkill River entero water quality monitoring results, 2012-2022
Wallkill River E.coli water quality monitoring results, 2021-2022
Sparkill Creek community water quality monitoring results, 2012-2021
Water quality over time in the Hudson’s major tributaries, 2012-2021
Water quality over time in lower Hudson tributaries, 2012-2021
Water quality over time in the mid-Hudson tributaries, 2012-2021
Water quality over time in the Mohawk & upper Hudson Rivers, 2015-2021
Water quality over time in the Rondout Creek & Wallkill River, 2012-2021
Roeliff Jansen Kill community water quality monitoring results, 2016-2019
Bronx River community water quality monitoring results, 2017-2018
Saw Kill community water quality monitoring results, 2016-2018
Community water quality monitoring - Tributary comparison report, 2018
How’s the water? A snapshot for the mid-Hudson
How’s the water? A snapshot for the lower-Hudson
How’s the water? A snapshot for New York City
How’s the water? A snapshot for the Mohawk
How’s the water? 2014 report, 2014
How’s the water? 2012 report, 2012
Other Riverkeeper reports (author or contributor)
Expert contributions to The Future of Filtration Avoidance, New York City Department of Environmental Protection, 2026:
Current and Emerging Risks to the New York City Department of Environmental Protection Filtration Avoidance Determination (General Comments, Disinfection Byproducts, Emerging Contaminants), Riverkeeper Science Director Dr. Shannon Roback, 2025
Integrative Panel Summary: Scientific Advisory Panel for Future of the Filtration Avoidance Determination (FAD) - Catskill/Delaware Water Supply System), 2026
Harmful algal blooms in the Hudson River, 2025
Peer-reviewed publications
Our partners at Columbia University’s Lamont-Doherty Earth Observatory and CUNY Queens College, and scientists at other institutions, have published many studies in the scientific literature in collaboration with Riverkeeper, either utilizing our water quality monitoring data or dealing with related patterns of sewage pollution or aquatic science. These contributions to scientific understanding, many with important implications for management of water resources, would not have been possible without the Riverkeeper Water Quality Program and Riverkeeper’s patrol boat. They include:
Best, M., Eakin, W. E., Pierce, D., Zydlewski, J. D., & Stich, D. S. (2026). Longitudinal variability of demographics and life history in an anadromous spawning population within a large, unimpeded East Coast, USA, watershed. Transactions of the American Fisheries Society, 155(3), 259-272.
Salawu, O. A., Han, Z., Senehi, N. L., Roback, S. L., & Adeleye, A. S. (2025). Determination of household wastewater PFAS composition and concentrations via neighborhood sampling. Journal of Hazardous Materials, 139834.
Damashek, J., Sheik, C. S., Petro, C., Reeder, C. F., Chowdhury, S., Kramer, B. J., ... & Fulweiler, R. W. (2025). DiazoTIME: a metabolically-resolved reference database of nitrogen-fixing microbial genomes. Microbiology resource announcements, 14(11), e00897-25.
L Albanese, A Vouga, D Shapley, S Roback, Impacts of road salt on drinking water quality, Mohawk Watershed Symposium 2024
S Roback, Drinking water quality and source water protection: challenges in a changing climate, Mohawk Watershed Symposium 2024
Cho, S., Hiott, L. M., Read, Q. D., Damashek, J., Westrich, J., Edwards, M., ... & FRYE, J. Distribution of antibiotic resistance in a mixed-use watershed and the impact of wastewater treatment plants on antibiotic resistance in surface water. Antibiotics 2023; 12: 1586. DOI: https://doi. org/10.3390/antibiotics12111586.
Damashek, J., Westrich, J. R., McDonald, J. M. B., Teachey, M. E., Jackson, C. R., Frye, J. G., ... & Ottesen, E. A. (2022). Non-point source fecal contamination from aging wastewater infrastructure is a primary driver of antibiotic resistance in surface waters. Water Research, 222, 118853.
Myers, E., and Juhl, A, 2020. Particle association of Enterococcus sp. increases growth rates and simulated persistence in water columns of varying light attenuation and turbulent diffusivity Water Research. doi.org/10.1016/j.watres.2020.116140Brigham, B., J. Bird, C. Zappa, A. Juhl, A. Montero, G. D. O’Mullan. 2019. Anthropogenic inputs from a coastal megacity are linked to greenhouse gas concentrations in the surrounding estuary. Limnology and Oceanography. doi.org/10.1002/lno.11200Press release: Study: Hudson River sewage overflows are an unaccounted-for source of greenhouse gas emissions.
O’Mullan, G.D., A. Juhl, R. Reichert, E. Schneider, and Natalia Martinez. 2019. Patterns of sediment-associated fecal indicator bacteria in an urban estuary: benthic-pelagic coupling and implications for shoreline water quality. Science of the Total Environment. 656:1168-1177. doi.org/10.1016/j.scitotenv.2018.11.405
Brooks, Spirito, S.Bae, Hong, Mosier, Sausele, Fernandez, Epstein, Shapley, Goodman, Anderson, Glaser and Richardson. 2019. Fecal Indicator Bacteria, Fecal Source Tracking Markers, and Pathogens Detected in Two Hudson River Tributaries. Water Research. doi.org/10.1016/j.watres.2019.115342
Cantwell, M.G., D.R. Katz, J.C. Sullivan, D. Shapley, J. Lipscomb, J.Epstein, A.R. Juhl, C. Knudson, and G.D. O’Mullan. 2018. Spatial Patterns of pharmaceuticals and wastewater tracers in the Hudson River Estuary. Water Research 137:335-343. doi.org/10.1016/j.watres.2017.12.044
C. Carpenter, D. Helbling. 2018. Widespread Micropollutant Monitoring in the Hudson River Estuary Reveals Spatiotemporal Micropollutant Clusters and Their Sources. Environmental Science & Technology 2018 52 (11), 6187-6196 doi.org/10.1021/acs.est.8b00945
O’Mullan, G.D., T.T. Eaton, and M.E. Dueker. 2018. Single-indicator strategies treat symptoms, not sources of sewage contamination, hampering water quality improvement in urban areas. Current Pollution Reports 4(4):280-282. doi.org/10.1007/s40726-018-0099-3
Dueker, M.E., S. French, and G. D. O’Mullan. 2018. Comparison of bacterial diversity in air and water of a major urban center. Frontiers in Microbiology. doi.org/10.3389/fmicb.2018.02868
Brigham, B., A. Montero, G.D. O’Mullan, and J. Bird. 2018. Acetate additions stimulate CO2 and CH4 production from urban wetland soils. Soil Science Society of America Journal 82(5):1147-1159. doi.org/10.2136/sssaj2018.01.0034
Stormer, D. G., & Juanes, F. (2017). Premigration Patterns of Growth, Condition, and Resource Use by the Spring‐Spawned and Summer‐Spawned Cohorts of Juvenile Bluefish in the Hudson River Estuary, New York. Marine and coastal fisheries, 9(1), 549-563.
O’Mullan, G.D., M.E. Dueker, and A. Juhl. 2017 Challenges to managing microbial fecal pollution in coastal environments: extra-enteric ecology and microbial exchange among water, sediment, and air. Current Pollution Reports. 3(1):1-16. doi.org/10.1007/s40726-016-0047-z
Dueker, M.E.; O’Mullan, G.D.; Martínez, J.M.; Juhl, A.R.; and Weathers, K.C. 2017. Onshore Wind Speed Modulates Microbial Aerosols along an Urban Waterfront. Atmosphere 8, 215. doi.org/10.3390/atmos8110215
Montero, A., M.E. Dueker, and G.D. O’Mullan. 2016. Culturable bioaerosols along an urban waterfront are primarily associated with coarse particles. PeerJ. 4:e2827; doi.org/10.7717/peerj.2827
Juhl, A.R. and O.R. Anderson. 2014. Geographic variability in amoeboid protists and other microbial groups in the water column of the lower Hudson River Estuary (New York, USA). Estuarine, Coastal and Shelf Science. 151:45-53. doi.org/10.1016/j.ecss.2014.09.020
Dueker, M.E. and G.D. O’Mullan. 2014. Aeration remediation of a polluted waterway increases near-surface coarse and culturable microbial aerosols. Science of the Total Environment. 478:184-189. doi.org/10.1016/j.scitotenv.2014.01.092
Young, S., A. Juhl, and G. O’Mullan. 2013. Antibiotic-resistant bacteria in the Hudson River Estuary linked to wet weather sewage contamination. Journal of Water and Health. 11(2):297-310. doi.org/10.2166/wh.2013.131
Eaton, T., G. O’Mullan, A. A. Rouff. 2013. Assessing contamination from continuous combined sewer outfall (CSO) discharge on a tidal creek; bacteriological and heavy metal indicators. Annals of Environmental Science. 7:79-92. http://academicworks.cuny.edu/qc_pubs/13
Dueker, M.E., G. O’Mullan, A. Juhl, K. Weathers,. and M. Uriarte. 2012. Local environmental pollution strongly influences culturable bacterial aerosols at an urban aquatic superfund site. Environmental Science and Technology 46(20):10926-10933. doi.org/10.1021/es301870t
Suter, E., A. Juhl, G. O’Mullan. 2011. Particle association of Enterococcus and total bacteria in the lower Hudson River Estuary, USA. Journal of water resource and protection 3(10):715-725. doi.org/10.4236/jwarp.2011.310082
Lesen, A.E., A.R. Juhl, O.R. Anderson. 2010. Heterotrophic microplankton in the lower Hudson River Estuary: potential importance of naked, planktonic amebas for bacterivory and carbon flux. Aquatic Microbial Ecology. 61:45-56. doi.org/10.3354/ame01434
Other reports
Riverkeeper’s partners in the scientific community have published numerous reports, white papers, posters and other materials outside of peer-reviewed scientific literature. They include:
E. Farrell. 2016. Utilizing DNA Sequencing and Land Use Data for an Improved Understanding of Fecal Contamination in Hudson River Tributaries. Reports of the Tibor T. Polgar Fellowship Program. S. Fernald, D. Yozzo, H. Andreyko, editors.