Water quality
* Some water quality affects aquatic life
  - growth
* affects consumption
  - fish species differently
  - the quality of education for Maine children
* can also affect the type of piping used for a geothermal system.
* can be a problem in hydroponic systems
  - ponds
  - change rapidly
  - suffer from diffuse pollution by nutrients or pesticides
* can vary a great deal depending on source and time of year
  - from city to city within a country
* can, and usually does, change considerably from top to bottom.
* concern for everyone in Arizona.
* depends on how well the source of the water is monitored, protected and analyzed.
* deteriorates with depth and is highly saline in some areas.
* faces threats from man's civilization, park visitors, and nature.
* fundamental indicator of aquatic ecosystem health.
* good indicator of whether sustainable development is taking place.
* has a direct impact on the value of lakefront property values
  - water quantity
  - major influence on aquatic life
  - several different meanings
* impacts the health of our citizens, livestock, and wildlife.
* influences the health of many components of ecosystems, including humans.
* is affected by groundwater quality and the use of land on the shoreline
  - the amount of industrial affluent discharged into canals and rivers
* is also important for our health and the environment
  - terrestrial organisms
  - poorer in ponds with large amounts of terrestrial vegetation
  - related to larger patterns of land use over entire watersheds
* is an important cichlid aquarium consideration
  - consideration when planning to raise animals
  - issue to all people
  - as important as quantity
  - based on the bacterial, chemical, mineral, and solids content of the water
  - critical for keeping clown loaches healthy
* is critical to the Everglades ecosystem
  - health of the turtle
  - survival of adults and juveniles
  - defined in terms of the chemical, physical and biological content of water
* is degraded as a result of nutrient enrichment, toxic substances, and sediment
  - by a wide variety of causes
  - dependent on landuses within the watersheds
  - determined by analyses of water samples
  - essential for coral survival and growth
  - everyone's responsibility
  - impacted more frequently in the fall, winter, and spring than in the summer
* is important to both rural and urban populations
  - the whole state
  - measured in terms of physical, chemical, and biological quality
* is monitored and controlled continually, saving time and increasing yields
  - in both watersheds before, during, and after timber harvesting
  - part of their way of life and of ensuring our way of life
  - particularly important to a flock affected by pox
  - protected by many different laws
  - the key to restoring grasses
* is the most important aspect of freshwater management
  - environmental concern facing U.S. agriculture
  - very dependent on the health of streams and waterways
* is very important for the survival of seahorses in an aquarium
  - when keeping any fish as a pet
* is vital for human and ecological health as well as economic prosperity
  - most human and ecological activities
* plays a role in the longevity of boilers, water heaters and water pumps
  - an important role in disease epidemics in catfish culture
* refers to the physical, chemical, and biological characteristics of water.
* shapes the aesthetics and uses of a lake.
* varies from place to place
  - greatly in the alluvial aquifers
  - greatly, just as the quality of light varies
  - with depth and location

### water soluble:

Few pesticide
* are water soluble.
* target one pest.