Summary of California water recycling criteria (summarized from Table R.3b.1 of the Metropolitan Council Stormwater Reuse Manual)
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Type of Use Total Coliform Limits (daily sampling is required) Treatment Required Comment (in relation to MIDS)
Irrigation of fodder, fiber, and seed crops; orchards/vineyardsa; processed food cropsb, non-food bearing trees; ornamental nursery stock/sod farmsc No Limits Established Oxidation Most likely applies to non-food bearing trees; ornamental nursery stock/sod farms with restricted access
Irrigation of pasture for miling animals, landscape areas (controlled access); ornamental nursery stock and sod farms where public access not restricted); landscape impoundments
  • ≤23/100mL (running 7-day median)
  • ≤240/100mL (in no more than one sample in any 30-day period)
Oxidation Disinfection This includes Cemeteries, freeway landscaping, restricted access golf courses, and other controlled access areas
Irrigation of food cropsa
  • ≤2.2/100mL (running 7-day median)
  • ≤23/100mL (in no more than one sample in any 30-day period)
Oxidation Disinfection
Irrigation of food cropsd; Open access landscape areas; Decorative fountains
  • ≤2.2/100mL (running 7-day median)
  • ≤23/100mL (in no more than one sample in any 30-day period)
  • 240/100mL (maximum)
Oxidation Coagulatione Filtratione Disinfection This includes parks, playgrounds, schoolyards, residential landscaping, unrestricted access golf courses, and other uncontrolled access areas; This may also apply to scenarios such as community gardens, etc.

a- No contact between reclaimed water and edible portion of crop

b- Food crops that undergo commercial pathogen destruction

c- No irrigation 14 days prior to harvesting, sale, or allowing public access

d- Contact between water and edible portion of crop including edible roots

e- Related to turbidity – See Metropolitan Council Reuse Manual for specific details