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25 Pa. Code § 73.32. Standards for aerobic treatment tanks.

§ 73.32. Standards for aerobic treatment tanks.

 (a)  Capacity shall comply with the following:

   (1)  The rated treatment capacity of an aerobic treatment tank shall be specified by the manufacturer. The manufacturer’s data shall be in conformance with the approved test sequence and protocol in subsection (b).

   (2)  The minimum manufacturer’s rated treatment capacity of an aerobic treatment tank approved under this section is 400 gpd.

   (3)  For single family dwelling units not served by a community system, a minimum daily flow of 400 gpd shall be used to determine required aerobic tank capacity. This figure shall be increased by 100 gallons for each additional bedroom over three. The daily flow indicated provides for use of garbage grinders, automatic washing machines, dishwashers and water softeners.

   (4)  For all other installations, the rated treatment capacity shall meet or exceed the estimated daily sewage flow as determined from §  73.17(a), (b) or (c) (relating to sewage flows).

 (b)  Testing and approval shall comply with the following:

   (1)  Aerobic treatment tanks serving single family dwellings, or establishments, with flows of 1,500 gpd or less shall bear the seal of the NSF indicating testing and approval by that agency under Standard No. 40.

   (2)  Units tested and awarded a seal under other than the current standard shall be approved for use until expiration of the seal. Units initially submitted for testing or resubmitted for testing shall be approved under the version of Standard No. 40 in effect at that time.

   (3)  Aerobic treatment tanks serving establishments with flows exceeding 1,500 gpd shall either:

     (i)   Have NSF certification under Criteria C-9.

     (ii)   Have performance data certified by NSF under the provisions of that agency’s Standard Performance Evaluation Method.

 (c)  The Department will provide local agencies with a current list of aerobic sewage treatment tanks that have been found to be in conformance with the Department’s standard.

 (d)  Multiple aerobic treatment tanks connected for the purpose of achieving required hydraulic capacity shall only be permitted where the tanks are connected in parallel. All tanks shall have equal capacity and receive equal loading.

 (e)  Every aerobic sewage treatment tank shall be equipped with a visual and audible alarm system which shall be designed to respond to any electrical or mechanical failure or malfunction of the tank or any component thereof.


   The provisions of this §  73.32 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 §  73.32 adopted August 2, 1971, effective August 14, 1971, 1 Pa.B. 1649; amended April 26, 1974, effective May 13, 1974, 4 Pa.B. 817; amended August 30, 1974, effective September 16, 1974, 4 Pa.B. 1805; amended 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 (217323) to (217324).

Cross References

   This section cited in 25 Pa. Code §  73.161 (relating to general).

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