Ten tributary locations within the Pennichuck Watershed have been continuously monitored for flow and total phosphorus, along with other common contaminants, since 2007. Groundwater monitoring for total phosphorus at nine of the ten tributary sampling locations or nearby began in 2013 to help determine phosphorus loads coming from groundwater baseflow versus from stormwater runoff. Annual Reports are generated at the close of each year of sampling, beginning in 2008, and are archived below.
- 2019 Tributary and Groundwater Sampling Program
- 2018 Tributary and Groundwater Sampling Program
- 2017 Tributary and Groundwater Sampling Program
- 2016 Tributary and Groundwater Sampling Program
- 2015 Tributary and Groundwater Sampling Program
- 2014 Tributary and Groundwater Sampling Program
- 2013 Tributary and Groundwater Sampling Program
- 2012 Tributary Sampling Program
- 2011 Tributary Sampling Program
- 2010 Tributary Sampling Program
- 2009 Tributary Sampling Program
- 2008 Tributary Sampling Program