Municipalities self-report their wastewater treatment levels based on the definitions provided in the MUD survey.

Wastewater treatment levels considered suitable for the purposes of producing reclaimed water for toilet flushing use in residential and commercial buildings include secondary, advanced secondary and tertiary treatment systems.

(iii) Readers should be aware that use of definitions of wastewater treatment levels that are different from those used in the MUD survey would yield different results from those represented in Figure 8.