The following is the Schedule of Equivalent Dwelling Units:
A. Residential wastewaters. Each single-family dwelling, defined as Class R-1, shall be considered to be one EDU. Other types of dwelling units shall be classified and charged according to criteria presented above and as follows:
(1) R-1 shall be considered one equivalent dwelling unit (EDU) and the basic minimum for all users.
(a) Single-family house; single-family area of a duplex house owned by two separate parties; single-family mobile home; single-family condominium; single-family camp; single-family summer house or vacation property for one family; rectory.
(2) R-2 shall be considered the following equivalent dwelling units (one EDU is minimum):
(a) Rooming house or group-living arrangement: one EDU per room.
(b) Halfway house, rehabilitation home, social or welfare home: one EDU per room.
(c) Apartment, apartment house, apartment addition, efficiency apartment or any full living arrangement: one EDU per apartment.
B. Mixed-residential wastewater. This classification is for users who conduct businesses in their residence. The appropriate residential rate plus an added charge based on the commercial activity shall be charged as outlined below:
(1) M pertains to a person's residence that also contains his in-home or at-home business. If the business or practice is not in his/her own home, it shall be governed by Class C-2. The basic minimum is one EDU for residential plus the number of other EDUs for the business or practice as given in the Schedule of Equivalent Dwelling Units for commercial, set forth herein.
C. Commercial wastewater. Commercial establishments, including private schools, service and nonprofit organizations and similar users, have been grouped in four categories in the sewer use classifications of this section. This Schedule of Equivalent Dwelling Units assigns the C-1 rate to special commercial users, differentiates between small and large commercial users by the number of employees in the C-2 and C-3 rate and assigns a C-4 rate to high-sewer-demand users, such as laundromats, restaurants, schools, etc. Commercial, business and organizational users will be calculated by formulas (minimum usage is one EDU).
(1) C-1, especially assigned equivalent dwelling units (EDUs) for special commercial, business and organizational users.
(a) Attorney's office: one EDU.
(b) Beauty parlor, beauty shop, hairdresser, barber: one EDU.
(d) Real estate office, insurance office, CPA, tax office, etc.: one EDU.
(e) Dentist's office, doctor's office: one EDU.
(f) Funeral director or funeral parlor: one EDU.
(g) Veterinarian or kennel: one EDU.
(h) Physical therapy office: one EDU.
(i) Mechanics garage, speed shop, bicycle shop: one EDU.
(j) Antique shop, flower shop, nursery, neighborhood grocery store, variety store: one EDU.
(k) Hotel or motel: one EDU per room.
(l) Meeting hall, social hall, union hall, auditorium, place of assembly (private or public): two EDUs.
(n) Billiard or game room: two EDUs.
(o) Exercise studio: two EDUs.
(p) Auto, truck or plane dealership: four EDUs.
(q) Bus line, truck terminal: four EDUs.
(r) Gym, health spa or recreation center: four EDUs.
(s) Organic laboratory: four EDUs.
(2) C-2 small commercial, business, social-service or nonprofit organization, agency or association with 10 or fewer workers, employees, managers or owners.
(No. of employees) x (20 GPD per employee)/(200 GPD per EDU) = No. of EDUs |
(3) C-3 large commercial, business, social-service or nonprofit organization, agency or association with 11 or more workers, employees, managers or owners.
(No. of employees) x (25 GPD per employee)/(200 GPD per EDU) = No. of EDUs |
(4) C-4 high-sewer-demand commercial and institutional.
(a) Laundromat, self-service laundry.
(No. of washing machines) x 400 GPD per washing machine/(200 GPD per EDU) = No. of EDUs |
(b) Restaurant, grill, cafe, luncheonette, coffee shop, diner, bar, nightclub, lounge, lodge or club.
[1] Capacity of up to 30 people: two EDUs.
[2] Capacity of 31 and above, by formula as follows:
2 EDUs +(Capacity minus 30) x 7 GPD/(200 GPD per EDU)= No. of EDUs |
(c) Car wash, laundry, dairy, rug cleaners, meatpacker, slaughterhouse.
Annual amount of water used in cubic feet/(10,000 cubic feet per EDU) = No. of EDUs |
(d) Hospital, nursing home or rest home.
(No. of beds) x (200 GPD per bed)/(200 GPD per EDU) = No. of EDUs |
(e) Bowling alley.
(No. of alleys) x (100 GPD per alley)/(200 GPD per EDU) = No. of EDUs |
(f) Movie house.
(No. of seats) x (3 GPD per seat)/(200 GPD per EDU) = No. of EDUs |
(g) Drive-in theater.
(No. of car stalls) x (5 GPD per stall)/(200 GPD per EDU) = No. of EDUs |
(h) Private, elementary, junior or senior high school.
(No. of pupils and teachers) x (20 GPD per pupil)/(200 GPD per EDU) = No. of EDUs |
(i) Boarding school.
(No. of pupils in residence) x (100 GPD/pupil)/(200 GPD per EDU) = No. of EDUs |
(No. of pupils not in residence) x (20 GPD/pupil)/(200 GPD per EDU) = No. of EDUs |
(5) Industrial wastewater. Three significant industrial user classifications are presented herein. The I-1 classification is used for significant industrial users who discharge fewer than 25,000 gallons of wastewater per day and includes nonsignificant categorical industrial users as defined herein. The I-2 classification is for significant industrial users discharging fewer than 25,000 gallons per day of wastewater, including those categorical industrial users which discharge more than 100 gallons per day of process wastewater. The I-3 classification is for significant industrial users discharging more than 25,000 gallons per day of wastewater, including those categorical industrial users discharging more than 100 gallons per day of process wastewater. All significant industrial users may be required to install metering and sampling stations in accordance with the requirements of these Rules.
(a) I-1. A sewer usage charge will be based upon the amount of wastewater discharged, determined by a method approved by the governing body. The past year's wastewater discharge will be used and converted to EDUs. The minimum charge is that for one EDU. Billing will be annually or quarterly, at the discretion of the governing body.
No. of EDUs = Past year's (or quarter's) wastewater discharge/73,000 gallons per year per EDU |
(b) I-2. A sewer usage charge may be based either upon percentage of total treatment facility flow contributed by the user or upon percentages of flow, BOD and SS of the total facility flow, BOD and SS, respectively. The method used shall be determined on a case-by-case basis by the governing body.
[1] Rate based on flow. A sewer usage charge based upon the percentage of total treatment facility flow contributed by the user times the net annual operating and maintenance costs is as follows:
Monthly charge = (O&M) x Past quarter user flow/Past quarter system flow |
O&M = 1/4 x Net annual operating and maintenance costs |
[2] Rate based on flow and strength. A sewer usage charge based upon the percentages of flow, BOD and SS contributed by the user, of those of the treatment facility times the net annual operating and maintenance cost and shall be weighted as follows for flow, BOD and SS:
[c] Suspended solids: 25% of total cost.
Weighted average = 0.5 x Past quarter user flow + 0.25/Total plant flow |
Past quarter user BOD/Total plant BOD + 0.25 x Past quarter user SS/Total plant SS Quarterly charge = (Weighted average) x (O&M) O&M = 1/4 x Net annual operating and maintenance costs |
(c) I-3. A sewer usage charge may be based either upon percentage of total treatment facility flow contributed by the user or upon percentages of flow, BOD and SS of the total facility flow, BOD and SS, respectively, as described in the previous subsection above. The method used shall be determined on a case-by-case basis by the governing body.