PREP Reports & Publications

Abstract

Nitrogen, phosphorus, and sediment loads to the Great Bay Estuary are a constant concern. The Piscataqua Region Estuaries Partnership (PREP) calculates the nitrogen load from tributaries to the Great Bay Estuary for its State of Our Estuaries reports. Therefore, the purpose of this study was to collect monthly data on nitrogen, phosphorus, and suspended solids concentrations in tributaries to the Great Bay Estuary in 2020-2023. The study design followed the tributary sampling design, which was implemented by the New Hampshire Department of Environmental Services (NHDES) between 2001 and 2007 and sustained by the University of New Hampshire (UNH) from 2008 to the present to provide comparable data to previous loading estimates. The purpose of this memorandum is to document the results of quality assurance checks on the 2020-2023 water quality data collected by UNH for the Great Bay Estuary Tidal Tributary Monitoring Program (GBETTMP), so that PREP can calculate the nitrogen load from tributaries to the Great Bay Estuary. This program was previously established in the NHDES Environmental Monitoring Database with a project identifier of “GBETTMP.” PREP reviewed these data to ensure that they met data quality objectives (DQO) for PREP and for Section 305b water quality assessments.

Date Created

October 2025

Publication Date

10-2025

Document Type

Report

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