4101.1 (a) The retail rates for sanitary sewer service for each one hundred cubic feet (1 Ccf) of water use shall be as follows:

Customer	Effective October 1, 2024		Effective October 1, 2025
	Per Ccf of water use	Per 1,000 Gals. of water use	Per Ccf of water use	Per 1,000 Gals. of water use
Residential	$12.07	$16.14	$12.52	$16.74
Multi-Family	$12.07	$16.14	$12.52	$16.74
Non-Residential	$12.07	$16.14	$12.52	$16.74

4101.2 The retail rates for sanitary sewer service for the discharge of groundwater, cooling water, and non-potable water sources shall be as follows:

(a) The retail groundwater sewer charge for an unimproved real property, property under construction, or under groundwater remediation shall be:

Customer	Effective October 1, 2024		Effective October 1, 2025
	Per Ccf of water use	Per 1,000 Gals. of water use	Per Ccf of water use	Per 1,000 Gals. of water use
All Customers	$3.50	$4.68	$3.76	$5.03

(b) The retail cooling water sewer charge shall be the retail sanitary sewer service rate as provided in Section 4101.1(a) for cooling water discharged into the District's wastewater sewer system.

(c) The retail non-potable water source sewer charge shall be the retail sanitary sewer service rate as provided in Section 4101.1(a) for non-potable water discharged into the District's wastewater sewer system.

4101.3 The annual Clean Rivers Impervious Area Charge (CRIAC) per Equivalent Residential Unit (ERU) shall be as follows:

Customer	Effective October 1, 2024		Effective October 1, 2025
	Annual CRIAC per ERU	Monthly CRIAC per ERU	Annual CRIAC per ERU	Monthly CRIAC per ERU
Residential	$254.76	$21.23	$290.76	$24.23
Multi-Family	$254.76	$21.23	$290.76	$24.23
Non-Residential	$254.76	$21.23	$290.76	$24.23

4101.4 The CRIAC shall be based upon the Equivalent Residential Unit (ERU). An ERU is defined as one thousand square feet (1,000 sq. ft.) of impervious surface area, taking account of a statistical median of residential properties.

4101.5 All residential customers shall be assessed a CRIAC based on the following Six-Tier Residential Rate Structure for the CRIAC:

Tier	Size of Impervious Area (Square Feet)	Equivalent Residential Unit (ERU)
Tier 1	100 - 600	0.6
Tier 2	700 - 2000	1.0
Tier 3	2,100 - 3,000	2.4
Tier 4	3,100 - 7,000	3.8
Tier 5	7,100 - 11000	8.6
Tier 6	11,100 and more	13.5

4101.6 All non-residential and multi-family customers shall be assessed ERU(s) based upon the total amount of impervious surface area on each lot. This total amount of impervious surface shall be converted into ERU(s), truncated to the nearest one-hundred (100) square feet.

4101.7 Impervious Only Properties are defined and subject to the follow requirements:

(a) Impervious Only Properties are properties that do not currently have metered water/sewer service (for example, parking lots) and may require the creation of new accounts; and

(b) Effective October 1, 2012, Impervious Only Properties shall be billed as follows:

(1) Impervious Only Properties with three (3) or more ERU's shall be billed monthly.

(2) Impervious Only Properties with less than three (3) ERU's shall be billed every six (6) months.

(3) Customers who are billed for more than one (1) property and who participate in District of Columbia Water and Sewer Authority's group billing program shall be billed monthly for all properties.

4101.8 High Flow Filter Backwash sewer rate and conditions shall be as follows:

(a) Charged the following sewer service rate:

Customer	Effective October 1, 2024		Effective October 1, 2025
	Per Ccf of water use	Per 1,000 Gals. of water use	Per Ccf of water use	Per 1,000 Gals. of water use
All Customers	$3.32	$4.44	$3.54	$4.73

(b) Subject to the following conditions:

(1) Discharge must exceed an annual average of one (1) million gallons per day (MGD), but not more than an annual average of ten (10) MGD;

(2) The discharge must be interruptible and only occur during periods of dry weather flow, as determined by DC Water; and

(3) The discharge is subject to a wastewater discharge permit.

SOURCE: Final Rulemaking published at 44 DCR 1993, 1994 (April 4, 1997); as amended by Final Rulemaking published at 47 DCR 320 (January 21, 2000); as amended by Final Rulemaking published at 49 DCR 5977 (June 28, 2002); as amended by Final Rulemaking published at 50 DCR 6452 (August 8, 2003); as amended by Final Rulemaking published at 51 DCR 8849 (September 10, 2004); as amended by Final Rulemaking published at 52 DCR 8528 (September 16, 2005); as amended by Final Rulemaking published at 53 DCR 7655 (September 22, 2006); as amended by Final Rulemaking published at 54 DCR 9178 (September 21, 2007); as amended by Final Rulemaking published at 55 DCR 9845 (September 19, 2008); as amended by Final Rulemaking published at 56 DCR 2728 (April 10, 2009); as amended by Final Rulemaking published at 56 DCR 2739 (April 10, 2009); as amended by Final Rulemaking published at 56 DCR 7534 (September 18, 2009); as amended by Final Rulemaking published at 57 DCR 8419, 8420 (September 17, 2010); as amended by Final Rulemaking published at 58 DCR 6941, 6942 (August 12, 2011); as amended by Final Rulemaking published at 59 DCR 8820, 8821 (July 27, 2012); as amended by Final Rulemaking published at 60 DCR 11239 (August 2, 2013); as amended by Final Rulemaking published at 61 DCR 9613 (September 19, 2014); as amended by Final Rulemaking published at 62 DCR 9798 (July 17, 2015); as amended by Final Rulemaking published at 63 DCR 9696 (July 22, 2016); as amended by Final Rulemaking published at 65 DCR 7569 (July 20, 2018); as amended by Final Rulemaking published at 66 DCR 8770 (July 26, 2019 – Part 1); as amended by Final Rulemaking published at 66 DCR 12432 (September 20, 2019); as amended by Final Rulemaking published at 67 DCR 11100 (September 18, 2020); as amended by Final Rulemaking published at 68 DCR 013639 (December 17, 2021); as amended by Final Rulemaking published at 69 DCR 009035 (July 22, 2022); as amended by Final Rulemaking published at 71 DCR 008682 (July 19, 2024).