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25 Pa. Code § 73.17. Sewage flows.

§ 73.17. Sewage flows.

 (a)  The flow figures in this subsection and subsection (b) are peak daily flows for the design of community onlot sewage systems. These flow figures are not intended to be used for the calculation of flows for the design of community sewerage systems or for the allocation of flows related to community sewerage systems. Design and permit sewage flows for a community sewerage system are to be calculated using the procedures established in the Department’s ‘‘Domestic Wastewater Facilities Manual.’’ The sewage flow from single family dwellings served by a community onlot sewage system or from apartments, rooming houses, hotels and motels served byan individual or community sewage system shall be determined from the following table:

Type of Establishment
Hotels and motels100.30
Multiple family dwellings and apartments, including townhouses, duplexes and condominiums4001.13
Rooming houses (per unit)200.60
Single family residences400*.90

 *For units of 3 bedrooms or less; for each bedroom over 3, add 100 gallons.

 (b)  The sewage flow, which shall exclude any industrial waste, for nonresidential establishments served by an individual or community sewage system shall be determined from the following table:

Type of Establishment
Airline catering (per meal served)3.03
Airports (per passenger—not including food)5.02
Airports (per employe)10.06
One licensed operator Beauty shops200
Bus service areas not including food (per patron and employe)5.02
Country clubs not including food (per patron and employe)30.02
Drive-in theaters (not including food—per space)10.06
Factories and plants exclusive of industrial wastes (per employe)35.08
Laundries, self-service (gallons/washer)4002.00
Mobile home parks, independent (per space)4001.00
Movie theaters (not including food, per auditorium seat)5.03
Offices (per employe)10.06
Restaurants (toilet and kitchen wastes per patron)10.06
(Additional for bars and cocktail lounges)2.02
Restaurants (kitchen and toilet wastes, single-service utensils/person)8.5.03
Restaurants (kitchen waste only, single-service utensils/patron)3.01
Stores (per public toilet)4002.00
Warehouses (per employe)35
Work or construction camps (semipermanent) with flush toilets (per employe)50.17
Work or construction camps (semipermanent) without flush toilets (per employe)35.02
Churches (per seat)3
Churches (additional kitchen waste per meal served) 3

Type of Establishment
Churches (additional with paper service per meal served) 1.5
Hospitals (per bed space, with laundry)300.20
Hospitals (per bed space, without laundry)220
Institutional food service (per meal)20
Institutions other than hospitals (per bed space)125.17
Schools, boarding (per resident) 100 .17
Schools, day (without cafeterias, gyms or showers per student and employe) 15 .04
Schools, day (with cafeterias, but no gym or showers per student and employe) 20 .08
Schools, day (with cafeterias, gym and showers per student and employe) 25 .10
Recreational and Seasonal
Camps, day (no meals served)10.12
Camps, hunting and summer residential (night and day) with limited plumbing including water-carried toilet wastes (per person) 50 .12
Campgrounds, with individual sewer and water hookup (per space)100.50
Campgrounds with water hookup only and/or central comfort station which includes water-carried toilet wastes (per space)50.50
Fairgrounds and parks, picnic—with bathhouses, showers, and flush toilets (per person) 15 .06
Fairgrounds and parks, picnic (toilet wastes only, per person) 5 .06
Swimming pools and bathhouses (per person) 10 .06

 (c)  Actual water meter or sewer meter flow data indicating peak daily flows different than those shown in this section over a 1-year period for a similar nonresidential establishment may be accepted for use in sizing the onlot disposal system. If average daily flows are used, the peak daily flow shall be calculated by multiplying the average daily flow by two.

 (d)  Establishments with food preparation facilities are required to install adequately designed pretreatment units and traps to reduce greases and biological oxygen demand (BOD) prior to discharge to an individual or community sewage system.


   The provisions of this §  73.17 amended under section 9 of the Pennsylvania Sewage Facilities Act (35 P. S. §  750.9); The Clean Streams Law (35 P. S. § §  691.1—691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. §  510-20).


   The provisions of this §  73.17 adopted January 21, 1983, effective January 22, 1983, 13 Pa.B. 508; amended November 7, 1997, effective November 8, 1997, 27 Pa.B. 5877. Immediately preceding text appears at serial pages (217318) to (217320).

Cross References

   This section cited in 25 Pa. Code §  71.52 (relating to content requirements—new land development revisions); 25 Pa. Code §  72.22 (relating to permit issuance); 25 Pa. Code §  73.16 (relating to absorption area requirement); 25 Pa. Code §  73.31 (relating to standards for septic tanks); 25 Pa. Code §  73.32 (relating to standards for aerobic treatment tanks); and 25 Pa. Code §  73.161 (relating to general).

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