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Regulations Governing On-Site Sewage Disposal Systems of the Williamson County Department of Sewage Disposal Management

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Regulations Governing On-Site Sewage Disposal Systems of the Williamson County Department of Sewage Disposal Management REGULATIONS GOVERNING ON-SITE SEWAGE DISPOSAL SYSTEMS OF THE WILLIAMSON COUNTY DEPARTMENT OF SEWAGE DISPOSAL MANAGEMENT AS OPERATED UNDER THE AUSPICES OF THE WILLIAMSON COUNTY BOARD OF HEALTH WILLIAMSON COUNTY, TENNESSEE ADOPTED MAY 16, 2000 Effective September 1, 2000 Revised Effective Date: October 1, 2000 TABLE OF CONTENTS SECTIONS Page 1 – Introduction..……………………………………………………………………………………………….….…… S1-1 2 – Statutory Authorizations and Enforcement……………………………………………………………….…..… S2-1 3 – Definitions…………………………………………………………………………………………………….……. S3-1 4 – Use of Subsurface Sewage Disposal Systems…………………………….…………………………………. S4-1 5 – Types of Subsurface Sewage Disposal Systems Authorized For Use ……………………………….….… S5-1 6 – Pit Privies and Composting Toilets……………………………………………………………………………… S6-1 7 – Permits………………..………………………………………………………....…………………………………. S7-1 8 – Installation of Septic Systems on Platted Parcels of Land………………………………………………….. S8-1 9 – Septic Systems and Unplatted Parcels of Land……………………………...……………………………….. S9-1 10 – Design and Construction of Tanks………………………………………….……………………………….…. S10-1 11 – Grease Traps………………………………………………………………………………………………………. S11-1 12 – Use of Effluent Treatment and Pre-Treatment Devices and Methods……………………………………… S12-1 13 – Minimum Setback Restrictions for Septic System Components ………….………………………………… S13-1 14 – Minimum Septic Tank Capacity……………………………………………………………………………..…… S14-1 15 – Conventional Subsurface Sewage Disposal Systems………………………………………………………… S15-1 16 – Utilization of Sewage/Effluent Pumps………………………………………….………………………………. S16-1 17 – Installation of Septic Tanks And Pump Tanks………………………………...………………………………. S17-1 18 – Minimum Pump Tank Capacity…………………………………………………..………………………………. S18-1 19 – Alternative Methods of Subsurface Sewage Disposal……………………….……………………………….. S19-1 20 – Inspection of Subsurface Sewage Disposal System Installations…………..………………………………. S20-1 21 – Backfilling and Final Grading of Subsurface Sewage Disposal System Installation Areas ……………… S21-1 22 – Maintenance and Care of An On-Site Sewage Disposal System …………………………………………... S22-1 23 – Erosion and Sediment Control Practices…………………………………….…………………………………. S23-1 24 – Licensing of Septic System Installers………………………………………..…………………………………. S24-1 25 – Appeal and Review of Actions…………………………………………………..………………………………. S25-1 26 – Subdivision of Land Parcels…………………………………………………..…………………………………. S26-1 27 – Approved Methods of Land Assessment………………………………………………………………………. S27-1 28 – Vegetative Condition of A Parcel of Land…………………………………..…………………………………. S28-1 29 – Establishment of Ground Control……………………………………………….………………………………. S29-1 30 – Domestic Septage Disposal……………………………………………………...………………………………. S30-1 31 – Pump and Haul of Holding Tanks……………………………………………….……………………………… S31-1 32 – Abandonment of Tanks…………………………………………………………..………………………………. S32-1 33 – Fees for Department Services…………………………………………………..………………………………. S33-1 34 – Repair or Modification of Subsurface Sewage Disposal Systems………….………………………………. S34-1 35 – Recertification of Subsurface Sewage Disposal Systems…………………….(Reserved)………………… S35-1 36 – Water Conservation and Best Management Practices……………………….………………………………. S36-1 i (Amended: October 16, 2018) APPENDICES Page 1 – Uniform Code of Soil Mapping Standards and Procedures for Williamson County, Tennessee……….. A1-1 2 – Percolation Tests – Requirements and Procedures……..……………………………………………………. A2-1 3 – Low Pressure Pipe Systems……………………………………..………………………………………………. A3-1 4 – Mound Systems……………………………………………………………………(Reserved)………………… A4-1 5 – Soil Drainage Improvement Practices…………………………….…………………………………………….. A5-1 6 – Construction Permit Application Process & Procedures ………………..……………………………………. A6-1 7 – Flow Rates for Subsurface Sewage Disposal System Design……………………………………………… A7-1 8 – Disposal Field Area Requirements ……………………………………………..………………………………. A8-1 9 – Designated Soil MPI Rates and Corresponding Disposal Field Linear Footage Requirements…………. A9-1 10 – Identification and Protection Requirements for Disposal Field Areas……………………………………… A10-1 11 – Controlled Distribution Devices…………………….……………………………………………………………. A11-1 12 – Materials Specifications…………………………….………….…………………………………………………. A12-1 13 – Charts & Tables…………………………………………………………………………………………………… A13-1 14 – Figures………………………………………………………..…………………….………………………………. A14-1 15 – As-Built Documentation Requirements…………………………………………………………………………. A15-1 16 – Subdivision of Land Parcels – Associated Information…….…………………………………………………. A16-1 17 – Plugging and Closing An Existing Water Well…………………………………………………………………. A17-1 18 – Water Conservation and Best Management Practices — (Encouraged)……………………………………. A18-1 19 – Operation Permit Application Process & Procedures…………………………………………………………. A19-1 ii (Amended: October 16, 2018; July 16, 2019) LIST OF AMENDMENTS Date Section/Appendix Topic September 19, 2000 Title Page Revised the effective date of the regulations. September 19, 2000 List of Amendments Added this page in the front of the regulations. September 19, 2000 Section 2 Added Subsection J regarding vested interests in approved documents. September 19, 2000 Section 8 Edited Subsection A, Part 1 regarding area identification and sequence of use. September 19, 2000 Section 19 Revised reference noted in Subsection C, Part 2, Subpart (b)(2)(iii) regarding vested plats and lots. September 19, 2000 Section 26 Edited typographical error in Subsection C, Part 4, Subpart (a). September 19, 2000 Section 26 Deleted Subsection F regarding vested plats and lots. September 19, 2000 Appendix 5 Revised references noted in Subsection C, Part 4 regarding vested plats and lots. September 19, 2000 Appendix 5 Edited typographical error in Subsection C, Part 4 resulting in positioning shifts to the remainder of the appendix. February 19, 2002 Section 24 Deleted Subsection B, Part 4 in its entirety and replaced with revised language effectively eliminating the requirement for an executed agreement. June 1, 2005 Section 3 Added definition for “bedroom” which thus, resulted in positioning shifts and re-numbering of the remainder of the section. May 16, 2006 Section 24 Deleted Subsection B, Part 4 in its entirety and replaced with revised language effectively requiring licensure with the State of Tennessee in addition to providing an annual surety to the Department. June 1, 2008 Section 2 Added Subsection K regarding nonconforming systems. June 1, 2008 Section 31 Deleted Subsection B, Part 1 in its entirety and replaced with revised language effectively outlining the specific conditions where pump and haul systems may be allowed for new sources. June 1, 2008 Section 31 Deleted Subsection C, Part 5 in its entirety effectively eliminating the requirement of a pump and haul system owner to execute an agreement with a utility providing ultimate treatment of the hauled waste. May 19, 2009 Section 32 Deleted the first sentence in Subsection C, Part 2 in its entirety and replaced it with a new sentence effectively eliminating this prescribed methodology as the only alternative tank abandonment procedure. May 19, 2009 Section 32 Added Part 3, 4 and 5 to Subsection C allowing a third prescribed methodology for tank abandonment procedures, outlining persons authorized to perform such work and describing the Department’s process to ensure conformance to this section of the regulations. December 15, 2009 Section 3 Added definition for “domestic kitchen” which thus, resulted in positioning shifts and re-numbering of the remainder of the section. December 15, 2009 Section 11 Added new Subpart (c) to Subsection A, Part 5 creating a new category (including domestic kitchens) requiring grease traps or, as an alternative, septic tank effluent test. Also, renumbered the original Subpart (c) as now Subpart (d). December 15, 2009 Section 15 Deleted the first sentence of Subsection D, Part 7 and Subparts (a) and (b) in their entirety and replaced with revised language effectively outlining new specific conditions where conventional systems must be designed by a licensed engineer. December 15, 2009 Section 20 Added new Subsection D, Part 2, Subpart (d), (11) and Subsection E, Part 2, Subpart (e), (10) regarding the inspection of rodent guards on the outlet end of drainage pipes. December 15, 2009 Appendix 5 Added new sentence at the end of the first paragraph of Subsection D, Part 5 requiring the installation of rodent guards on the outlet end of drainage pipes. December 15, 2009 Appendix 12 Added new Part 4 of Subsection D regarding proper rodent guards installed on the outlet end of drainage pipes. iii (List of Amendments continued): Date Section/Appendix Topic December 15, 2009 Appendix 16 Inserted new Part 21 of Subsection B requiring notations to be placed on plats regarding when conventional systems must be designed by a licensed engineer. Re-numbered all subsequent Parts of this Subsection. April 16, 2013 Section 13 Added setback categories for excavations ≤18”, irrigation systems and utility easements; edited category for excavations >12” to be >18”; edited various setback distances for categories of septic tank and above-ground swimming pools (where any excavation is required); clarified the category for overhead power lines to include all overhead utility lines; clarified the category of house or structure to include both existing and proposed; edited footnote 11 so as to properly reference Section 15, Subsection F, Part 24 instead of Section 15, Subsection D, Part 23; created footnote 12 and added it to the platted drainage easement category as it relates to drainage improvement
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