1. (a) An OTNWS must be designed and operated to achieve the minimum pathogen log reduction targets for onsite wastewater, graywater, stormwater, and roof runoff as set forth in Table 60630-1 using a pathogen control treatment train meeting the requirements of section 60632 or an alternative to a pathogen control treatment train meeting the requirements of section 60634.

2. (b) When multiple types of untreated alternate water sources are blended to supply the OTNWS, the most restrictive pathogen log reduction target must be met.

   Table 60630-1. Pathogen log reduction targets for OTNWS

   Untreated alternate water source

   Use type

   Enteric virus

   Giardia

   Cryptosporidium

   Onsite wastewater

   Indoor use

   8.0

   6.5

   5.5

   Onsite wastewater

   Outdoor use

   7.5

   5.5

   5.0

   Stormwater

   Indoor use

   7.0

   5.5

   4.5

   Stormwater

   Outdoor use

   6.5

   4.5

   4.0

   Graywater

   Indoor use

   6.0

   4.5

   3.5

   Graywater

   Outdoor use

   5.5

   3.5

   3.0

   Roof runoff

   Indoor use

   -

   1.5

   -

   Roof runoff

   Outdoor use

   -

   1.0

   -

Note: Authority cited: Sections 13558 and 13558.1, Water Code; and Sections 116271 and 116350, Health and Safety Code. Reference: Sections 13558 and 13558.1, Water Code.

History

1. New article 4 (sections 60630-60634) and section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).