Glossary term
Water Quality
Physical, chemical, biological, and operational condition of water relative to a defined use, discharge, or environmental objective.
Definition
conceptWater quality is the physical, chemical, biological, and operational condition of water relative to a defined use, discharge, or receiving environment.
Water quality is context dependent. Drinking water, process water, cooling water, stormwater, groundwater, wastewater effluent, mine water, and receiving waters can require different parameters, sampling methods, treatment controls, and acceptance criteria.
Water quality describes the condition of water relative to a purpose or receiving environment. The same water may be acceptable for dust suppression and unacceptable for drinking, discharge, cooling, irrigation, habitat protection, or process use.
Typical parameters include temperature, pH, turbidity, conductivity, dissolved oxygen, suspended solids, nutrients, metals, organic compounds, salinity, pathogens, odor, toxicity, and process-specific contaminants. The relevant set depends on the boundary and decision.
Engineering use
Water-quality engineering supports drinking-water systems, wastewater treatment, stormwater controls, industrial discharge, groundwater remediation, mine dewatering, reuse systems, receiving-water protection, and compliance monitoring.
Sampling design matters. Location, timing, preservation, flow condition, analytical method, detection limit, and chain of custody can change whether the result represents the system.
Common mistakes
A common mistake is treating water quality as one number. Another is comparing samples collected under different flow, weather, or operating conditions without stating the basis. A strong water-quality review states the intended use, parameters, sampling plan, flow condition, treatment objective, analytical method, acceptance criteria, and uncertainty.