In southwest Oregon, groundwater is found primarily in random bedrock fractures.  There is no uniform water table or mapped water sources, so groundwater quantity is unpredictable.  Historically in this area, about 25-30% of drilled wells produce 3 gallons per minute (gpm) or less.

The average adult uses 75-100 gallons a day (probably more during hot weather); 350-400 gallons a day (equivalent to 1/4 gpm) can meet the household needs of a family of four.  Landscaping, livestock, vineyards, or similar uses require considerably more water.

An important issue for most sellers and buyers of rural property is the water requirement of local lenders.  Even those who do not need to borrow to buy will want a future buyer to be able to qualify.  Local lenders require 5 gpm during a four hour flow test; most will accept 2-3 gpm when connected to an external storage tank, usually of 1200-1800 gallon capacity.  A two gallon well can furnish 2800 gallons over a twenty four hour period; when combined with external storage, it makes a very workable system.

Properties outside fire district boundaries may be required by the county to provide a storage system (or pond) for fire fighting.  Many rural dwellers like the idea of having a fire fighting capability even when within a fire district.

No water right is necessary in Oregon when using a well to water lawns and gardens less than one-half acre in area; or when used for domestic purposes in amounts less than 15,000 gallons a day.  Many commercial and agricultural users require a water right.  If you are planning such a use, it is advisable to start your water right application before drilling the well.  Why?  Because a well within 1/4 mile of a creek or surface body of water is presumed to be drawing water from that source.  The cost of proving otherwise may be considerable.