Call for free analysis: 800-580-5350

Los Angeles Water Reuse Regulations

Tier 1B: Pressurized Rainwater Catchment Systems
  • Includes: Rainwater that is collected and used onsite.
    Excludes: Stormwater, dry weather runoff, recycled water, and rainwater collected from locations zoned for manufacturing or industrial use.
  • Indoor
    Allowed Uses: Toilet and urinal flushing, laundry washing, trap primers and cooling tower make-up
    Minimum Water Quality Standard: NSF 350, or CCR Title 22 Recycled Water Quality Equivalence at the point of use, or Ch.17 CPC E.coli < 100 CFU/100 ml turbidity < 10 NTU
    Treatment Process: Ch. 17 CPC Table 1702.9.4 Prescreening & 100 μm filtration w/ disinfection
  • Outdoor
    Allowed Uses: Drip and subsurface irrigation, vehicle washing, spray irrigation ≥ 360
    gallons storage, non-interactive outdoor water feature
    Minimum Water Quality Standard: NSF 350 with disinfection or CCR Title 22 Recycled Water Quality Equivalence at the Point of Use or Ch.17 CPC E.coli Treatment Process: Ch. 17 CPC Table 1702.9.4 prescreening and 100 μm filtration with disinfection
    Treatment Process: Ch. 17 CPC Table 1702.9.4 prescreening and 100 μm filtration with disinfection
  • Tier 2: Graywater
  • Includes: “Graywater” that is collected and used onsite. Graywater systems may also use water from air conditioner condensate and cooling tower-blow-down. Systems that combine rainwater and graywater are classified as graywater systems.
    Excludes: Stormwater, dry weather runoff, and wastewater from kitchen sinks or toilets.
  • Indoor
    Allowed Uses: Toilet and urinal flushing, laundry washing, trap primers, and cooling tower make-up
    Minimum Water Quality Standard: NSF 350 with disinfection, or CCR Title 22 Recycled Water Quality Equivalence at the point of use, or other standard matching or exceeding presently accepted standards
    Treatment Process: Packaged Units and/or Design Build Units – evaluated and complying with NSF 350 certification standard as a complete system
  • Outdoor (Untreated)
    Allowed Uses: Mulch basin and subsurface irrigation
    Minimum Water Quality Standard: N/A
    Treatment Process: Pre-screening
  • Outdoor (Treated)
    Allowed Uses: Spray and drip irrigation, non-interactive outdoor water feature, vehicle washing
    Minimum Water Quality Standard: NSF 350 with disinfection or Title 22 Recycled Water Quality Equivalence
    Treatment Process: Packaged Units and/or Design Build Units shall be NSF 350 Certified as a complete system
  • Tier 3: Stormwater
  • Includes: Stormwater and dry weather runoff collected from non-point sources. Stormwater may contain various contaminants (fertilizers, oil, grease, salt, etc.)
    Excludes: Any water that has not entered a municipal stormwater system.
  • Indoor
    Allowed Uses: Toilet and urinal flushing, trap primers, and cooling tower make-up
    Minimum Water Quality Standard: NSF 350, or CCR Title 22 Recycled Water Quality Equivalence at the point of use, or other standard matching or exceeding presently accepted standards and meets all bacterial limits at point of use when distributed offsite and meets California Maximum Contamination Levels and the California Toxics Rule Standards
    Treatment Process: Packaged Units and/or Design Build Units – evaluated and complying with NSF 350 certification standard as a complete system
  • Outdoor (Non-Spray Irrigation)
    Allowed Uses: Mulch basin, drip, and subsurface irrigation
    Minimum Water Quality Standard: NSF 350 if sprayed
    Treatment Process: Package Units and/or Design Build Units evaluated on a case-by- case basis per project
  • Outdoor (Spray Irrigation, Other)
    Allowed Uses: Spray irrigation, non-interactive outdoor water feature, vehicle washing, dust control
    Minimum Water Quality Standard: CCR Title 22 Recycled Water Quality Equivalence at the point of use and meets all bacterial limits at point of use when distributed offsite and meets California Maximum Contamination Levels and the California Toxics Rule Standards
    Treatment Process: Packaged Units and/or Design Build Units shall be NSF 350 Certified as a complete system
  • The Los Angeles guidelines for water reuse are available as PDF download.

    Water Harvesting Systems from Wahaso

    With 25+ years experience in water harvesting system design and implementation, we are experts in systems for large buildings. It is our core competencies in system design, filtration, control systems, our experience, and our focus on only the commercial and institutional building market that set us apart from other rainwater or greywater system suppliers.

    Wahaso is an approved vendor in the state of California that can combine stormwater management and greywater reuse into an integrated commercial water harvesting system. Wahaso’s systems are compliant with NSF-350 standards and all local codes, including all new regulations. As members of the U.S. Green Building Council (USGBC), we understand the broader goals and concerns of clients interested in achieving LEED certification for their building, and we can actively support the design and documentation of a water harvesting approach to maximize LEED points in this area.

    Ready to take the next step? We provide a free water balance assessment, system recommendation, and a free consultation on options and implications. To get started, contact us today.

  • Water Harvesting Solutions, Inc.

    P.O. Box 279
    Hinsdale, IL 60522
    Call Toll Free: 800-580-5350

  • © 2017 Wahaso - Water Harvesting Solutions, Inc. All Rights Reserved.
  • wp_footer();