tikatuwq: Water Quality Assessment and Environmental Compliance in Brazil

Tools to import, clean, validate, and analyze freshwater quality data in Brazil. Implements water quality indices including the Water Quality Index ('WQI'/'IQA') using the weighted geometric mean following 'CETESB' methodology, the Trophic State Index ('TSI'/'IET') after Carlson (1977) <doi:10.4319/lo.1977.22.2.0361> and Lamparelli (2004) <https://teses.usp.br/teses/disponiveis/41/41134/tde-20032006-075813/publico/TeseLamparelli2004.pdf>, and the National Sanitation Foundation Water Quality Index ('NSF WQI', Brown (1970)). The package also checks compliance with Brazilian standard 'CONAMA' Resolution 357/2005 <https://conama.mma.gov.br/?id=450&option=com_sisconama&task=arquivo.download> including the legal frequency rule (Art. 15, 80% conformity over six or more samples per year), and provides seasonal analysis with regional flow-season calendars, pollutant load computation, exceedance probability estimation, 'IET' visualization, and multivariate 'PCA' tools for routine monitoring workflows. The example dataset ('wq_demo') is a real subset from 'INEMA' monitoring data from a river in Bahia, Brazil (2020-2024).

Version: 0.9.0
Depends: R (≥ 4.1)
Imports: dplyr, readr, tibble, rlang, stats, utils, ggplot2, tidyr, lubridate, stringr, glue, scales, broom, purrr, tools
Suggests: testthat (≥ 3.0.0), spelling, rmarkdown, knitr, pkgdown, leaflet, withr
Published: 2026-06-09
DOI: 10.32614/CRAN.package.tikatuwq
Author: Vinicius Saraiva Santos ORCID iD [aut, cre]
Maintainer: Vinicius Saraiva Santos <vinisaraiva at gmail.com>
BugReports: https://github.com/tikatuwq/tikatuwq/issues
License: MIT + file LICENSE
URL: https://github.com/tikatuwq/tikatuwq, https://tikatuwq.github.io/tikatuwq/
NeedsCompilation: no
Language: en-US
Citation: tikatuwq citation info
Materials: README, NEWS
CRAN checks: tikatuwq results

Documentation:

Reference manual: tikatuwq.html , tikatuwq.pdf
Vignettes: tikatuwq: Water Quality Indices and Temporal Trends (source, R code)
tikatuwq: From raw water quality data to CONAMA report (source, R code)
tikatuwq: basic workflow (source, R code)

Downloads:

Package source: tikatuwq_0.9.0.tar.gz
Windows binaries: r-devel: tikatuwq_0.9.0.zip, r-release: tikatuwq_0.8.2.zip, r-oldrel: tikatuwq_0.9.0.zip
macOS binaries: r-release (arm64): tikatuwq_0.9.0.tgz, r-oldrel (arm64): tikatuwq_0.9.0.tgz, r-release (x86_64): tikatuwq_0.9.0.tgz, r-oldrel (x86_64): tikatuwq_0.9.0.tgz
Old sources: tikatuwq archive

Linking:

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