Analysis and Visualization Tools for Hydrochemical Analysis R package hydrochem version 0.1.0 Provides a comprehensive suite of tools for processing, analyzing, and visualizing hydrochemical data in a reproducible and programmatic workflow. Implements unit conversion, censored data management, ionic balance calculation, water type classification, and a range of hydrochemical indices relevant to water quality assessment. Offers advanced visualization functions for generating Piper (Piper, 1944, <doi:10.1029/TR025i006p00914>), Durov (Durov, 1948), Stiff (Stiff, 1951, <doi:10.2118/951376-G>), Collins (Collins, 1923, <doi:10.1021/ie50160a030>), Schoeller (Schoeller, 1935), Gibbs (Gibbs, 1970, <doi:10.1126/science.170.3962.1088>), and ternary diagrams — the standard graphical tools used in hydrochemical interpretation. Unlike existing solutions that rely on spreadsheets or proprietary graphical software, 'hydrochem' is designed for scalability and reproducibility, lowering the technical barrier for hydrochemists working with datasets of varying complexity. It integrates seamlessly into modern R workflows and supports rigorous water resource management and research. Software Depends: R (>= 4.1.0) Imports: cowplot (>= 1.2.0), data.table (>= 1.16.2), ggplot2 (>= 3.5.1), grDevices, scales (>= 1.4.0), stats Suggests: spelling Guillaume Cinkus <guillaume.cinkus@gmail.com> Comprehensive R Archive Network (CRAN) Guillaume Cinkus [aut, cre] (ORCID: <https://orcid.org/0000-0002-2877-6551>), Raphaël Bondu [aut] (ORCID: <https://orcid.org/0000-0003-3838-6693>) GPL-2 2026-06-24 application/tgz https://CRAN.R-project.org/package=hydrochem doi:10.32614/CRAN.package.hydrochem en-US