Resources

• The Commercial, Industrial, Institutional Dedicated Irrigation Meter (CII-DIM) Standard

  SB 606 and AB 1668, signed in 2018 and referred to as the Long-Term Framework legislation, are intended to make conservation a California wa...

• A Practical Guide to Measuring Landscape Areas with Dedicated Irrigation Meters in CII Sectors

  This guidebook is designed for urban water suppliers or their consultants to support compliance with the State’s Water Use Efficiency Regu...

Mixed-Use Meter (MUM):

• A MUM is a water meter managed by the water supplier that records the total volume of water used by a customer, covering both indoor and outdoor water usage.

Large Landscapes:

• Defined as Commercial, Industrial, and Institutional (CII) landscapes that are ½ acre or larger in size and served by Mixed-Use Meters (MUMs).

§ 973. Threshold for converting Commercial, Industrial, and Institutional landscapes with mixed meters to Dedicated Irrigation Meters or employing in-lieu water management technologies

(a) Each urban retail water supplier shall either:

(1) By June 30, 2027, identify all existing commercial, industrial, and institutional (CII) water users associated with large landscapes;

or (2) By June 30, 2029, identify all existing CII water users associated with a large landscape and for which estimated outdoor water use exceeds the water budget calculated pursuant to subdivision (c)(1).

(b)

(1) For existing CII water users identified pursuant to subdivision (a), a supplier shall either install dedicated irrigation meters (DIMs) or employ at least one of the in-lieu technologies from paragraph

(2) and offer the best management practices (BMPs) from paragraph (3). (2) In-lieu technologies include:

(A) Water budget-based management program without a rate structure

(B) Water budget-based rate structures

(C) Installation of technologies that enables the supplier to identify, estimate, and analyze outdoor water use, which may include but is not limited to Advanced Metering Infrastructure

(D) Use of technologies that enable suppliers to identify, estimate, and analyze outdoor water use, which may include but are not limited to remote sensing

(E) Other in-lieu technologies that enable suppliers to identify, estimate, and analyze water use or improve outdoor water use efficiency, subject to Board approval.

(3) Best management practices include, at a minimum, one BMP from section 974(f)(1) and at least two BMPs identified in section 974 (f)(3), including (B) and (C).

(c)

(1) A supplier that calculates a budget for commercial, industrial, and institutional water users associated with large landscapes (CIIMUM) pursuant to subdivision (a)(2) shall do so by multiplying the area of those landscapes (LALL) by net reference evapotranspiration (Net ET0), by 0.63 or, for Special Landscape Areas, 1.0, and by a unit conversion factor of 0.62. This formula is expressed mathematically as follows:

CIIMUM = LALL × Net ET0 × (0.63 or, for Special Landscape Areas, 1.0) × 0.62

(2) For purposes of this section, the area of the landscapes (LALL) shall include only CII water users associated with large landscapes and shall be quantified and substantiated by the supplier using data generated by the Department.

(3) Notwithstanding paragraph (2), a supplier may use data that it has demonstrated to the Department, in coordination with the Board, to be equivalent or superior in quality and accuracy.

(d) By June 30, 2039, a supplier shall have either installed dedicated irrigation meters (DIMs) on, or employed in-lieu water technologies for and offered BMPs to, all the water users identified pursuant to subdivision (a). By June 30, 2040 and thereafter, the supplier shall either have installed a DIM on, or employed in-lieu water technologies for and offered BMPs to, at least 95 percent of all commercial, industrial, and institutional (CII) water users associated with large landscapes, as assessed on a reporting year basis.

(e) For systems that do not meet the criteria to be considered an urban retail water supplier until after the effective date of this section, and for a system that hydraulically consolidates with a supplier, this section applies beginning fifteen (15) years after the system meets the criteria to be considered a supplier or consolidates with a supplier.

Authority: Sections 1058 and 10609.10, Water Code. References: Article X, Section 2, California Constitution; Sections 102, 104, 105, 350, 1122, 1123, 1124, 1846, 1846.5, 10608.12, 10609.2, and 10609.10, Water Code

For the compliance phase of large CII landscapes with mixed-use meters (MUMs), suppliers need to collect the following data:

Option 1: For Suppliers Installing DIMs

• (i) Number of Water Users: The total number of CII water users with large landscapes that have had DIMs installed.
• (ii) Aggregate Square Footage: The total square footage of large landscapes where DIMs have been installed.

Option 2: For Suppliers Using In-Lieu Technologies and Offering Best Management Practices (BMPs)

• (i) Number of Water Users: The number of CII water users with large landscapes where in-lieu technologies have been employed, and BMPs offered.
• (ii) Aggregate Square Footage: The total square footage of large landscapes where in-lieu technologies and BMPs have been applied.
• (iii) Types of In-Lieu Technologies Used: A list of the specific in-lieu technologies employed.
• (iv) Narrative Description for Board-Approved Technologies: If an in-lieu technology outside of those listed in section 973(b)(2) is used, a description of the technology must be provided.
• (v) BMPs Offered: A list of the BMPs provided, as outlined in section 973(b)(3).
• (vi) Estimated Annual Water Savings: The estimated amount of water saved annually through implementing section 973(b).

• 975. Reporting

(a) Each urban retail water supplier shall submit to the Board, no later than January 1, 2024, and by January 1 every year thereafter, the report required by Water Code section 10609.24. The report shall reflect the conditions of the previous state fiscal year, except as specified in subdivision (b).

(b) No later than January 1, 2025, and by January 1 every year thereafter, each urban retail water supplier shall submit to the Board, on a machine-readable form provided by the Board, the supplier’s urban water use objective calculated pursuant to section 966 along with relevant and supporting data.

Option 1: (C) For suppliers that have installed dedicated irrigation meters (DIMs) pursuant to section 973(b):

(i) The number of water users associated with large landscapes that have had a DIM installed

(ii) The aggregate square footage of large landscapes that have had a DIM installed.

Option 2: (D) For suppliers that have employed in-lieu technologies and offered Best Management Practices (BMPs) pursuant to section 973(b):

(i) The number of water users associated with large landscapes for which the supplier has employed in-lieu technologies and offered BMPs

(ii) The aggregate square footage of those large landscapes

(iii) The in-lieu technologies that have been employed

(iv) If the Board has approved the use of an in-lieu technology other than those listed in section 973(b)(2), a narrative description of the technology employed

(v) The BMPs offered pursuant to section 973(b)(3) (vi) The estimated annual water savings associated with section 973(b)