Quality Control and Analysis of Massachusetts Water Quality Data R package MassWateR version 2.2.1 Methods for quality control and exploratory analysis of surface water quality data collected in Massachusetts, USA. Functions are developed to facilitate data formatting for the Water Quality Exchange Network <https://www.epa.gov/waterdata/water-quality-data-upload-wqx> and reporting of data quality objectives to state agencies. Quality control methods are from Massachusetts Department of Environmental Protection (2020) <https://www.mass.gov/orgs/massachusetts-department-of-environmental-protection>. Software Depends: R (>= 4.1.0) Imports: curl, dplyr, flextable, ggplot2, ggrepel, ggspatial, httr, lubridate, maptiles, RColorBrewer, rmarkdown, readxl, sf, tidyr, tidyterra, tibble, units, writexl Suggests: covr, knitr, mockery, patchwork, testthat (>= 3.0.0) Marcus Beck <mbeck@tbep.org> Comprehensive R Archive Network (CRAN) Marcus Beck [aut, cre] (ORCID: <https://orcid.org/0000-0002-4996-0059>), Jill Carr [aut], Ben Wetherill [aut] (ORCID: <https://orcid.org/0000-0002-8791-4256>) CC0 2026-02-09 application/tgz https://CRAN.R-project.org/package=MassWateR doi:10.32614/CRAN.package.MassWateR