Contact Environmental Health for more information. If a well's flow is below these minimum thresholds, or if no well log is available, then a four hour draw down test is required. The test determines what quantity of flow can be produced continuously without depleting the well. Any variation from the minimum storage capacity of 1350 gallons or other criteria must be designed and justified by a certified engineer. A list of those companies with pre-approved designs is available at the Environmental Health office.
Springs have more requirements for safeguarding the water and for treatment.
Please see the Environmental Health handout on springs. For your convenience, Benton County Environmental Health also maintains a list of local water professional and consultants. Oregon Water Resources Dept.