Water
Core concepts
WELL v2 Water addresses drinking-water quality, contaminant limits, treatment, monitoring, maintenance, moisture management, and Legionella control. Preconditions establish baseline quality and treatment; optimizations cover monitoring, maintenance, moisture management, and building water-system safety. Candidates should understand the difference between point-of-use treatment and building-level treatment, and between potable-water quality and non-potable uses.
Water quality parameters often tested include turbidity, coliforms, residual disinfectant, lead, copper, and other contaminants. Treatment may include filtration, softening, reverse osmosis, or disinfection depending on source water and project needs. Monitoring confirms performance over time; maintenance keeps treatment systems and distribution lines functioning.
Traps
Do not confuse water quality with water treatment: quality is the outcome, treatment is a method. Legionella control is not only about drinking water-it covers building water systems such as cooling towers, hot tubs, decorative fountains, and hot-water distribution. Moisture management is also a Water concept because leaks, condensation, and high humidity drive mold and slip hazards. A frequent mistake is assuming a point-of-use filter solves a building-wide contamination problem.
Rule of thumb
If the question describes aerosols from a cooling tower or fountain, think Legionella control plan; if it describes lead at a tap, think treatment plus monitoring at the point of use.
Worked example
A project has acceptable incoming municipal water but old interior piping. The team proposes only a lobby water filter. That does not address distribution risk. A better answer combines corrosion control or pipe replacement, flushing/maintenance, and representative sampling at fixtures.