1. (a) The minimum DDF for dwelling units shall be 120 gpd per bedroom or 60 gpd per person when occupancy exceeds two persons per bedroom, whichever is greater.

2. (b) DDF for facilities other than dwelling units shall be in accordance with Table II as follows:

   TABLE II. Design daily flow for Facilities

   Facility type	Design daily flow
   Commercial
   Airports, railroad stations, bus and ferry terminals, etc.	5 gal/traveler, food preparation not included
   Barber shops	50 gal/chair
   Bars, cocktail lounges	20 gal/seat, food preparation not included
   Beauty shops, style shops, hair salons	125 gal/chair
   Bed and breakfast homes and inns	Dwelling unit DDF based on Paragraph (a) of this Rule plus 120 gal/rented room which includes the following: Meals served to overnight guests Laundry for linens 150 gal/room with cooking facilities in individual rooms
   Event Center	5 gal/person with toilets and hand sinks up to 4 hrs 10 gal/person with toilets and hand sinks up to 8 hrs 15 gal/person with toilets and hand sinks greater than 8 hrs Add 5 gal/person with full kitchen
   Markets open less than four days/week, such as a flea market or farmers market	30 gal/stall or vendor, food preparation not included
   Marinas with no holding tank discharge included	30 gal/boat slip, with bathhouse 10 gal/boat slip, wet slips or slips on dock 5 gal/boat slip, dry storage or warehouse
   Motels/hotels	120 gal/room includes the following: No cooking facilities in individual rooms other than a microwave or other similar devices No food service or limited food service establishment Laundry for linens 150 gal/room with cooking facilities in individual rooms
   Offices and factories with no IPWW included	12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift Add 10 gal/employee for showers
   Stores, shopping centers, and malls	100 gal/1,000 ft2 of retail sales area, food preparation not included
   Warehouse that are not retail sales warehouses	100 gal/loading bay or 12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift
   Storage warehouse including self-storage facilities and does not include caretaker residence	12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift
   Alcoholic beverage tasting areas with no process wastewater included	200 gal/1,000 ft2 of tasting area floor space and includes glass washing equipment Food preparation and food clean up not included 12 gal/employee/≤ 8 hr shift
   Camps/Campgrounds
   Summer camps with overnight stays*	60 gal/person, applied as follows: 15 gal/person/food preparation 20 gal/person/toilet facilities 10 gal/person/bathing facilities 15 gal/person/laundry facilities
   Day camps not inclusive of swimming area bathhouse*	20 gal/person and 5 gal/meal served with multiuse service or 3 gal/meal served with single-service articles
   Temporary Labor Camp or Migrant Housing Camp with overnight stays*	60 gal/person, applied as follows: 15 gal/person/food preparation 20 gal/person/toilet facilities 10 gal/person/bathing facilities 15 gal/person/laundry facilities
   Travel trailer or RV in an RV park*	100 gal/space
   Recreational Park Trailer or Park Model Trailer 400 ft2 or less in an RV park*	120 gal/space
   Bathhouse for campsites and RV park sites with no water and sewer hook ups with a maximum of four people per campsite	70 gal/campsite
   Food preparation facilities
   Food Establishments with multiuse articles*	25 gal/seat open 6 hrs/day or less 40 gal/seat open 6 to 16 hrs/day Add 4 gpd/seat for every additional hour open beyond 16 hrs
   Food Establishments with single service articles*	20 gal/seat open 6 hrs/day or less 30 gal/seat open 6 to 16 hrs/day Add 3 gpd/seat for every additional hour open beyond 16 hrs
   Food stand with up to eight seats, mobile food units, and commissary kitchens*	50 gal/100 ft2 of food stand, food unit, or food prep floor space and 12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift
   Other food service facilities*	5 gal/meal served with multiuse articles 3 gal/meal served with single service articles
   Meat markets or fish markets with no process wastewater included*	50 gal/100 ft2 of floor space and 12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift
   Health care and other care institutions
   Hospitals*	300 gal/bed
   Rest homes, assisted living homes, group homes, and nursing homes*	150 gal/bed with laundry 75 gal/bed without laundry Add 60 gal/resident employee
   Family child care home or child care centers	15 gal/person open ≤ 12 hr shift without laundry Add 1 gal/person/hr open for more than 12 hrs per day Add 5 gal/person with full kitchen
   Drug rehabilitation, mental health, and other care institutions	75 gal/person with laundry Add 12 gal/employee/≤ 8 hr shift or 60 gal/resident employee Add 2 gal/employee/hr for more than 8 hr shift
   Orphanages	60 gal/student or resident employee with laundry
   Public access restrooms
   Convenience store, service station, truck stop*	250 gal/toilet or urinal meeting the following: Open less than 16 hrs/day Food preparation not included Retail space not included
   325 gal/toilet or urinal meeting the following: Open 16 to 24 hrs/day Food preparation not included Retail space not included
   Highway rest areas and visitor centers*	325 gal/toilet or urinal or 10 gal/parking space, whichever is greater
   Recreational facilities
   Bowling center	50 gal/lane, food preparation not included
   Community center, gym	5 gal/person plus 12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift or 50 gal/100 ft2, whichever is greater
   Country club or golf course	10 gal/person 12 gal/employee/≤ 8 hr shift Add 2 gal/employee/hr for more than 8 hr shift 3 gal/person for convenience stations Food preparation not included
   Fairground	250 gal/toilet or urinal
   Fitness center, spas, karate, dance, exercise	5 gal/person Add 10 gal/person for showers Food preparation not included
   Recreational park, State park, county park, and other similar facilities with no sports facilities	10 gal/parking space
   Outdoor sports facilities, mini golf, batting cages, driving ranges, motocross, athletic park, ball fields, stadium, and other similar facilities	250 gal/toilet or urinal, 5 gal/seat, or 10 gal/parking space, whichever is greater Food preparation not included
   Auditorium, theater, amphitheater, drive-in theater	2 gal/seat or 10 gal/parking space, whichever is greater Food preparation not included
   Swimming pools and bathhouses	5 gal/person domestic waste only, bathing load of pool may be used as an alternative method of sizing
   Sports facilities courts or other similar facilities	250 gal/toilet or urinal or 50 gal/court, whichever is greater
   Institutions
   Church or other religious institution*	2 gal/seat sanctuary only 3 gal/seat with warming kitchen in same structure as sanctuary 5 gal/seat with full kitchen in same structure as sanctuary
   Public or private assembly halls used for recreation, regularly scheduled meetings, events, or amusement * For churches, flow shall be in addition to sanctuary structure flow	2 gal/person with toilets and hand sinks 3 gal/person with addition of a warming kitchen 5 gal/person with full kitchen
   Schools
   Day schools*	6 gal/student with no cafeteria or gymnasium 9 gal/student with cafeteria only 9 gal/student with a gymnasium only 12 gal/student with cafeteria and gymnasium
   After school program	5 gal/student in addition to flow for regular school day
   Boarding schools	60 gal/student and resident employee with laundry

   * Facility has potential to generate HSE.

3. (c) The minimum DDF from any facility other than a dwelling unit shall be 100 gpd. For facilities with multiple design units, the minimum DDF shall be 100 gpd per design unit. The DDF of the facility shall be the sum of all design unit flows.
4. (d) DDF determination for wastewater systems with facilities not identified in this Rule shall be determined using available water use data, capacity of water‑using fixtures, occupancy or operation patterns, and other measured data from the facility itself or a comparable facility.
5. (e) Where laundry is not specified for a facility in Table II, but is proposed to be provided, the DDF shall be adjusted to account for the proposed usage and machine water capacity. The applicant or a licensed professional shall provide cut-sheets for laundry machines proposed for use in facilities.
6. (f) HVAC unit or ice machine condensate, gutter or sump pump discharge, water treatment system back flush lines, or similar incidental flows shall not discharge to the wastewater system, unless a PE designs the wastewater system for these flows.
7. (g) Unless otherwise noted in Table II, the DDF per unit includes employees.
8. (h) Food service facilities and other facilities that are projected to generate wastewater with constituent levels greater than DSE, as defined in Rule .0402 of this Section, are identified in Table II with a single asterisk (*) as HSE. Any facility that has a food service component that contributes 50 percent or more of the DDF shall be considered to generate HSE. Determination of wastewater strength shall be based on projected or measured levels of one or more of the following: BOD, TSS, FOG, or TN. Table III of Rule .0402(a) of this Section identifies the constituent limits for DSE.
9. (i) Wastewater with constituents other than those listed in Table III of Rule .0402(a) of this Section may be classified as IPWW as defined in G.S. 130A-334(2a) on a site-specific basis.
10. (j) A request for an adjusted DDF shall be made in accordance with Rule .0403 of this Section.

History Note: Authority G.S. 130A-335(e); S.L. 2013-413, s.34; S.L. 2014-120, s.53; S.L. 2023-77, s.9; S.L. 2024-49, s.4.20;
Eff. January 1, 2024;
Amended Eff. June 1, 2026.