| clean_units | Normalize/standardize units (placeholder) |
| conama_check | CONAMA conformity check (detailed; default class = "2") |
| conama_limits | Limits for Brazilian CONAMA 357/2005 |
| conama_report | CONAMA conformity report (table) |
| conama_summary | CONAMA conformity summary (long format) |
| conama_text | Text summary of conformity (bulleted, formatted) |
| generate_analysis | Generate analytical paragraphs (rule-based) |
| iet_carlson | Trophic State Index (Carlson) |
| iet_lamparelli | Trophic State Index (Lamparelli) |
| iqa | Water Quality Index (WQI / IQA) |
| nsfwqi | NSF Water Quality Index (NSF WQI, prototype) |
| plot_box | Boxplots by site/parameter |
| plot_heatmap | Heatmap of parameters vs. sites |
| plot_iqa | Plot IQA by site/date |
| plot_map | Mapa interativo de pontos de coleta |
| plot_series | Time series by parameter |
| read_wq | Read water-quality CSV (robust parsing) |
| render_report | Render a water-quality report from the internal R Markdown template |
| resume_wq | Descriptive summaries by group |
| validate_wq | Validate presence of required columns |
| wq_demo | Demo water quality dataset |