1. (a) Residential water treatment backwash shall be discharged only to:

   1. (1) An ISDS that is designed and sized to accommodate the volume of backwash generated; or
   2. (2) An alternative disposal system as specified in (b) and (c), below.

2. (b) An alternative disposal system for residential water treatment backwash shall:

   1. (1) Infiltrate on the property served by the water treatment system;
   2. (2) Not cause soil erosion, siltation, or overland run-off;
   3. (3) Not discharge to any surface water or wetland;
   4. (4) Accept residential water treatment backwash only;
   5. (5) Be located so as to minimize any influence on water supply wells and ISDS on the property served or on adjacent properties; and
   6. (6) Not cause or contribute to any violation of the ambient groundwater quality standards as specified in Env-Or 603 on adjacent properties.
3. (c) An alternative disposal system such as a mini-dry well, small leaching pit, or trench with perforated pipe shall be used only if it meets the parameters specified in (b), above.
4. (d) An alternative disposal system meeting the parameters specified in (b), above, shall not require approval from the department.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36