I am planning to purchase a piece of raw land in Lamoille County Vermont, this summer; I plan to use a composting toilet (new one), and hope to only have to put in a septic system which covers grey water d/c.
 Reading the Q&A from a previous Q has been quite helpful (thanks!).
 One property I have my eye on, already has a conv septic design in place, so I guess now I just need to talk to the state, to be sure I know what needs to be done to get a permit for the Innovative Alternative (I/A) - fingers crossed that it will save me some $$.
 I already have someone reliable and affordable to do all of the site work and installation, so I feel fortunate in that regard......hopefully the state regs won't give me fits :/
 I am glad to have any additional info/input regarding this topic 
 I still have to slog through it, but I've posted below, State of Vermont DEC link and it's contents (C&P'd, though it came out a bit fragmented), showing some helpful info.
 
http://dec.vermont.gov/water/programs/ww-systems/innovative-alternative/approved-systems
 .
 Innovative Alternative Approved Systems and Products
 Below are several tables of information related to approved systems and products for innovative/alternative wastewater disposal practices.
 List of I/A Distributors and Service Providers
 Specific Treatment System and Product Approvals for General Use
 Approval Number
 Approval
 Approval Expires
 Additional Information
 2001-01-R9 AdvanTex® AX™ and AX-Max™
 textile treatment systems September 28, 2019
 Orenco Systems, Inc.
 www.orenco.com
 2006-01-02-R3 Aqua-Aire and Aqua-Safe®
 aerobic wastewater treatment systems September 28, 2019
 Ecological Tanks, Inc.
 www.etiaquasafe.com
 2003-02-R4 Bioclere™
 recirculating fixed film trickling filter treatment systems September 27, 2019
 Aquapoint.3, LLC
 www.aquapoint.com
 2004-01-R5
 MicroFAST®, RetroFAST®, HighStrengthFAST®
 fixed activated sludge treatment systems
 and Lixor® submerged aeration system product
 January 20, 2020  Bio-Microbics, Inc.
 www.biomicrobics.com  
 2018-01 ClearPod™
 Drop-in, retro-fit, aeration and fixed film technology January 7, 2019
 Island Water Technologies
 www.islandwatertech.com
 2015-03-R1 ECOPOD-N™
 aerobic with fixed media treatment systems March 30, 2019
 Delta Environmental Products™
 www.deltaenvironmental.com
 2002-02-R5
 Ecoflo®
 peat/mixed media and coco treatment systems
  
 September 10, 2018
 Premier Tech Environment
 www.premiertechaqua.com
 2015-02-R1 FujiClean USA™
 contact filtration aerobic wastewater treatment systems March 9, 2019 FujiClean USA™ LLC
  www.fujicleanusa.com
 2015-01-R1 Hydro-Action®
 aerobic wastewater treatment systems February 22, 2019 Hydro-Action Mfg. Inc.
 www.hydro-action.com
 2013-02-R4 Jet™  
 aerobic wastewater treatment systems June 30, 2018 Jet Inc.
 www.jetincorp.com
 2005-01-R4 Norweco Singulair®  and Hydro - Kinetic®
 suspended growth extended aeration January 25, 2019
 Norweco, Inc.
 www.norweco.com
 2003-03-R5 Puraflo®
 peat fiber biofilter treatment system January 18, 2020
 Anua
 www.anua-us.com
 2002-03-R3 SeptiTech®
 recirculating trickling filter August 22, 2018
 SeptiTech®, a subsidiary of Bio-Microbics, Inc.
 www.septitech.com
 2008-02-R3 The Clean Solution™
 aerobic wastewater treatment system January 26, 2020
 Advanced Onsite Solutions LLC
 www.thecleansolution.com
 The Clean Solution VT Manual 2016
 Dispersal System Product Approvals for General Use
 Approval Number
 Approval
 Approval Expires
 Additional Information
 2015-05-R1 Mantis™
 gravelless pipe distribution systems November 29, 2019
 Eljen Corporation
 www.eljen.com
 Vermont Design Manual - Eljen
 2010-01-R4  ARC and BioDiffuser
 gravelless leaching chamber dispersal systems
   August 21, 2018
 Infiltrator® Water Technologies, LLC
 www.infiltratorsystems.com
 Vermont Design & Installation Manual - ARC
 2006-04-R3
 Leaching Chambers
 gravelless leaching chamber dispersal systems
  
 August 21, 2018
 Infiltrator® Water Technologies, LLC
 www.infiltratorsystems.com
 Vermont Manual - System Sizing
 2004-02-R4 Advanced Enviro-Septic®, Enviro-Septic®, and Simple Septic®
 gravelless pipe distribution systems February 23, 2019
 Presby Environmental, Inc.
 www.presbyeco.com
 Vermont Design Manual
 2014-01-R1 Perc-Rite®
 drip distribution units May 31, 2018
 American Manufacturing Company, Inc.
  www.oaksoninc.com
 Perc Rite Drip Dispersal Design Manual
 Product Approvals for Pilot Projects
 Approval Number
 Approval
 Approval Expires
 Additional Information
 2015-04-R1 The NIBBLER®
 fixed film pre-treatment systems August 25, 2019 Aqua Test Inc.
 www.thenibblercompany.com
 Products That Substitute for Traditional Methods
 Product Information
 Company Website
 EZflow® Infiltrator® Water Technologies, LLC
 www.infiltratorwater.com
 Flout®
 floating outlet distribution box, alternative to a dosing siphon Rissy Plastics, LLC
 www.rissyplastics.com
 Hydro-Splitter®
 mechanical distribution alternative to a distribution box Orenco Systems, Inc.
 www.orenco.com
 Tru-Flow®
 splitter system alternative to distribution box
 Zoeller Company
 www.zoeller.com
 Products Approved for Use as Septic Tanks or Septic Tank Effluent Filters
 Product Information
 Company Website
 STF-110 Series
 Bristle brush effluent filters GAG Sim/Tech Inc
 
http://www.gag-simtech.com
 Onsite Effluent Filter Bear Onsite, LLC
 www.bearonsite.com
 SaniTEE®
 effluent wastewater screen
 Bio-Microbics, Inc.
 www.biomicrobics.com
 FRALO SEPTECH™
 polyethylene septic tanks
 Fralo Plastech Manufacturing LLC
 www.fralo.net
 Septic and Pump Tanks, IM-Series and TW-Series
 Infiltrator® Water Technologies, LLC
 www.infiltratorsystems.com
 Infiltrator IM & TW Series Septic Tank General Installation Instructions
 Septic Tanks Norwesco, Inc.
 www.norwesco.com
 Low Profile Septic Tanks Norwesco, Inc.
 www.norwesco.com
 Biotube® FT series and Universal Biotube® PVU series
 effluent filters and pump vaults Orenco Systems, Inc.
 www.orenco.com
 Fiberglass Septic Tank Orenco Systems, Inc.
 www.orenco.com
 Effluent Filters, PL-68, PL-122, PL-525 Polylok, Inc.
 www.polylok.com
 Roth MultiTank (RMT) models Roth Global Plastics, Inc.
 www.roth-usa.com
 Effluent Filters, EF-4 and EF-6 Tuf-Tite®, Inc.
 www.tuf-tite.com
 Polyethylene Septic Tanks Xactics 2001 International
 www.xactics.com
 Filters
 Zoeller, Inc.
 www.zoeller.com
 Accepted for Use Without Approval - Letters indicating that a technology is not subject to the rules
 Product Information
 Description
 The Juggler A septic tank pumping truck that removes solids and returns water to septic tank
 Miller Septic tank liner
 Expired Products - Septic Product Approvals for General Use
 Approval Number
 Approval
 Approval Expires
 Additional Information
 2013-01 GEO-Flow® Pipe
 gravelless pipe distribution systems March 7, 2015
 Advanced Drainage Systems Inc.
 www.ads-pipe.com
 Vermont Design Manual  March 2013
 2007-01-R1 Cromaglass™
 wastewater treatment systems, sequencing batch reactor September 19, 2014 Chromaglass Corporation
 www.cromaglass.com
 2005-02 Enviro-Guard™
 combined process, equalized treatment systems September 1, 2009
 Consolidated Treatment Systems, Inc.
 www.consolidatedtreatment.com
 2003-01 AIRR
 alternating intermittent recirculating reactor treatment systems July 1, 2008
 SPEC Industries, Inc.
 www.specind.biz
 Expired Products - Specific Product Approvals for Pilot Use
 Approval Number
 Approval
 Approval Expires
 Additional Information
 P-2005-01 Eco-Solutions
 advanced wetland treatment systems
 March 1, 2011 www.ecosoldesigns.com