Stream Pollution Trends Monitoring Program (SPOT)
The SPoT project is primarily funded by SWAMP. SPoT monitors trends in sediment toxicity and sediment contaminant concentrations in selected large rivers throughout California, and relates contaminant concentrations and toxicity to watershed land uses. It is designed to improve our understanding of watersheds and water quality by monitoring changes in both over time, evaluating impacts of development, and assessing the effectiveness of regulatory programs and conservation efforts at the watershed scale.
The overall goal of this long-term trends assessment is to detect meaningful change in the concentrations of contaminants and their biological effects in large watersheds at time scales appropriate to management decision making. Sediment toxicity and a suite of pesticides, trace metals, and industrial compounds have been analyzed from 100 sites annually since 2008.
The program design will be revised beginning in 2015 to reflect observed trends in stream contaminants and toxicity. This will allow for monitoring of additional chemicals of emerging concern and toxicity indicator species appropriate for these chemicals.
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SPoT Reports and Fact Sheets
The toxicity categories in these reports, non-toxic, some toxicity, moderate toxicity, and high toxicity are assigned to SPoT sites using the attached flow chart.
- New! Spatial and Temporal Trends in Toxicity and Chemical Contamination Relative to Land Use in California Watersheds: Fourth Report - Seven-Year Trends 2008-2014
- Trends in Chemical Contamination, Toxicity and Land Use in California Watersheds: Five-Year Trends 2008-2012
The report covers five-years trends of toxicity and contaminants concentration in major watesheds of California and assesses impact of land uses to water quality for the same period. The report also covers Regional trends.
- Initial Trends in Chemical Contamination, Toxicity and Land Use in California Watersheds - Field Years 2009-2010
This report covers the second annual survey and identifies trends of toxicity and chemical contamination, and the watershed land uses associated with their presence in California streams. The report also covers Regional trends for the same study period.
- Statewide Perspective on Chemicals of Concern and Connections between Stream Water Quality and Land Use - Field Year 2008
This report covers the first annual survey and identifies chemicals of concern and the watershed land uses associated with their presence in California streams. The data collected can be used in a space-for-time-swap approach to estimate the effect that further land use change (such as increasing urbanization) would have on stream water quality in California.
- SWAMP Statewide Stream Contaminant Trend Monitoring at Integrator Sites - July 2008
- Toxicity Work Group Recommendation for Evaluating Toxicity Data from Tests Conducted at a Non-Standard Test Temperature: Technical Memo March 2016
The purpose of this memo is to provide guidance for data users as SPoT and other SWAMP monitoring programs continue to generate low temperature test results. The initial focus is on data generated for tests with H. azteca, but the principles apply to tests with other standard test organisms.
- Introduction to Toxicity Test Methodology and Applications: Technical Memo February 2016
This memo provides an overview of the history, methodology, quality assurance, data analysis, follow up procedures and applications of toxicity tests in both water and sediment.
- Updated recommendations for monitoring current-use pesticide toxicity in water and sediment in the Surface Water Ambient Monitoring Program: Technical Memo September 2015
This technical memo explains SWAMP's recommendations for choosing appropriate species and tests to monitor for current-use pesticides in urban and agricultural settings.
- Toxicity in California Waters - Complete report of nine years of toxicity testing data collected by SWAMP and partner programs - October 2011
- Toxicity in California Waters, Regional Toxicity Reports - August 2012
- Statewide Investigation of the Role of Pyrethroid Pesticide in Sediment Toxicity in California's Urban Waterways - August 2008
- Toxicity Testing and Toxicity Identification Evaluation Final Report - April 2007
- SPoT Quality Assurance Project Plan (QAPP) – July 2012
- California Environmental Data Exchange Network (CEDEN)
First click on Find Data box, then choose either Water Quality or Toxicity in the Result Category box, in SELECT PROGRAMS box choose Surface Water Ambient Monitoring Program, then in SELECT PROJECTS box choose Stream Pollution Trend and then click on RETRIEVE DATA box to download the data.
Debra Denton, Ph.D.
U.S. EPA Region 9
Standards and TMDL Office
1001 I Street
Sacramento, CA 95814
Phone: (916) 341-5520
Michelle Hladik, Ph.D.
Placer Hall, 6000 J Street
Sacramento, CA 95819
Phone: (916) 278-3183
Kelly Moran, Ph.D
TDC Environmental, LLC
4020 Bayview Avenue
San Mateo CA 94403
Phone: (650) 627-8690