Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-218 - Underground injection control program
Section 173-218-050 - Exemptions from UIC well status

(1) Single-family residential septic systems, handling only sanitary wastes and have the capacity to serve less than twenty people per day or an equivalent design capacity of less than 3,500 gallons per day;

(2) Nonresidential septic systems and cesspools handling only sanitary wastes and have the capacity to serve less than twenty people per day or an equivalent design capacity of less than 3,500 gallons per day;

(3) Any dug, blasted or drilled hole, bored shaft that is not used for the subsurface placement of fluids in accordance with 40 C.F.R. 144.1(g)(1)(ii);

(4) Infiltration ponds, dispersion systems, or infiltration trenches that do not contain perforated pipe; or

(5) Storm drain components that contain perforated pipes, drain tiles or other similar mechanisms designed and intended to convey water directly or indirectly to a surface water body.